ads

Wednesday 29 June 2011

How are basal and squamous cell skin cancers treated?




This information represents the views of the doctors and nurses serving on the American Cancer Society's
Cancer Information Database Editorial Board. These views are based on their interpretation of studies
published in medical journals, as well as their own professional experience.
The treatment information in this document is not official policy of the Society and is not intended as
medical advice to replace the expertise and judgment of your cancer care team. It is intended to help you
and your family make informed decisions, together with your doctor.
Your doctor may have reasons for suggesting a treatment plan different from these general treatment
options. Don't hesitate to ask him or her questions about your treatment options.
General treatment information 
The next few sections describe the types of treatments used for non-melanoma skin
cancers. This is followed by a discussion of the typical treatment options based on the
type of skin cancer.
The treatments described in these sections are those used for actinic keratosis, squamous
cell carcinoma, basal cell carcinoma, and/or Merkel cell carcinoma. Other skin cancers,
such as melanoma, lymphoma of the skin, Kaposi sarcoma, and other sarcomas are
treated differently and are discussed in separate documents.
Fortunately, most basal cell and squamous cell carcinomas can be cured with fairly minor
surgery or other types of local treatments.
Surgery  
There are many different kinds of surgery for basal cell and squamous cell skin cancers.
The options for surgery depend on how large the cancer is, where it is on the body, and
the specific type of skin cancer. In most cases the surgery can be done in a doctor's office
or hospital clinic. For certain skin cancers with a high risk of spreading, surgery may
sometimes be followed by other treatments, such as radiation or chemotherapy.
Simple excision 
This is similar to an excisional biopsy (described in the section called "How are basal and
squamous cell skin cancers diagnosed?"), but in this case the diagnosis is already known.
For this procedure, the skin is first numbed with a local anesthetic. The tumor is then cut
out with a surgical knife, along with some surrounding normal skin. The remaining skin
is carefully stitched back together, leaving a small scar

Curettage and electrodesiccation 
This treatment removes the cancer by scraping it with a curette (a long, thin instrument
with a sharp edge on one end), then treating the area where the tumor was located with an
electric needle (electrode) to destroy any remaining cancer cells. This process is often
repeated. Curettage and electrodesiccation is a good treatment for small basal cell and
squamous cell cancers. It will leave a small scar.
Mohs surgery (microscopically-controlled surgery) 
Using the Mohs technique, the surgeon removes a thin layer of the skin that the tumor
may have invaded and then checks the sample under a microscope. If cancer cells are
seen, the next layer is removed and examined. This is repeated until the skin samples are
found to be free of cancer cells. This process is slow, but it means that more normal skin
near the tumor can be saved. This creates a better appearance after surgery. This is a
highly specialized technique that should be used only by doctors who have been trained
in its use.
Lymph node surgery 
If lymph nodes near a non-melanoma skin cancer (especially a squamous cell or Merkel
cell carcinoma) are growing larger, doctors will be concerned that the cancer may have
spread to these lymph nodes. The nodes may be biopsied (see the section, “How are basal
and squamous cell skin cancers diagnosed?”) or removed by an operation called a lymph
node dissection and looked at under a microscope for signs of cancer. This operation is
more involved than surgery on the skin, and usually requires general anesthesia (where
you are asleep).
Lymphedema, a complication where excess fuid collects in the legs or arms, is a possible
long-term side effect of a lymph node dissection. Lymph nodes in the groin or under the
arm normally help drain fluid from the legs and arms. If the lymph nodes are removed,
fluid may build up, leading to swelling in these limbs. If severe enough, it can cause skin
problems and an increased risk of infections in the limb. Elastic stockings or compression
sleeves can help some people with this condition. For more information, see our
document, Understanding Lymphedema (For Cancers Other Than Breast Cancer).
Skin grafting and reconstructive surgery 
After removing large non-melanoma skin cancers, it may not be possible to stretch the
nearby skin enough to sew the edges of the wound together. In these cases, healthy skin
may be taken from another part of the body and grafted over the wound to help it heal
and to restore the appearance of the affected area. Other reconstructive surgical
procedures can also be helpful in some cases.

Other forms of local therapy 
Several other techniques can be used to treat basal and squamous cell skin cancers that
have not spread to lymph nodes or other parts of the body. Some of these treatments are
described as types of surgery since they destroy a targeted area of body tissue. But these
techniques don't involve using scalpels or cutting into the skin.
Cryosurgery (cryotherapy) 
For this treatment, liquid nitrogen is applied to the tumor to freeze and kill abnormal
cells. After the dead area of skin thaws, it may swell, blister and crust over. The wound
may take a month or 2 to heal and will leave a scar. The treated area may have less color
after treatment.
Cryosurgery is often used for pre-cancerous conditions such as actinic keratosis and for
small basal cell and squamous cell carcinomas.
Photodynamic therapy (PDT) 
This treatment uses a special drug that is either applied to the skin or injected into the
blood. It collects in the tumor cells over the course of several hours or days and makes
the cells sensitive to certain types/colors of light. A light source is then focused on the
tumor(s), which causes the cells to die. A possible side effect of PDT is that it can make a
person's skin very sensitive to sunlight for a period of time (often several weeks), so
precautions may be needed to avoid severe burns.
PDT can be used to treat actinic keratoses. But its exact role in treating non-melanoma
skin cancers, if any, still needs to be determined. For more information on this technique,
see our document called Photodynamic Therapy.
Topical chemotherapy 
Chemotherapy uses drugs that kill cancer cells. Topical chemotherapy means that an anticancer medicine is placed directly on the skin (usually in a cream or ointment) rather than
being given by mouth or injected into a vein. The drug most often used in topical
treatment of basal and squamous cell skin cancers is 5-fluorouracil (5-FU).
When applied directly on the skin in the form of a cream, 5-FU reaches cancer cells near
the skin surface, but it cannot reach cancer cells that may have invaded deeply into the
skin or spread to other organs. For this reason, treatment with 5-FU generally is used only
for pre-cancerous conditions such as actinic keratosis and for some very superficial skin
cancers.
Because it is only applied to the skin, the drug does not spread throughout the body, so it
doesn't cause the same side effects that can occur with systemic chemotherapy (treatment
that affects the whole body). But it can cause the treated skin to become red and very
sensitive for a few weeks, which can be quite bothersome for some people. Other topical
medicines can be used to help relieve this. Fluorouracil also increases the skin's

sensitivity to sunlight, so treated areas must be protected from the sun for a few weeks
after use of this cream to prevent sunburn.
A gel containing the drug diclofenac is sometimes used to treat actinic keratoses. This
drug belongs to the non-steroidal anti-inflammatory drugs (NSAIDs), a group that
includes pain relievers such as aspirin and ibuprofen.
Immune response modifiers 
Certain drugs can boost the body's immune system response against the cancer, causing it
to shrink and go away.
Imiquimod is a cream that can be applied to actinic keratoses and some basal cell cancers.
It is not a chemotherapy drug. Instead, it causes the immune system to react to the skin
lesion and cause its destruction.  
Interferon is a man-made version of an immune system protein. It can be injected directly
into the tumor to boost the immune response against it. It may be used occasionally when
surgery is not possible, but it may not be as effective as other treatments.
Laser surgery 
This relatively new approach uses a beam of laser light to vaporize cancer cells. It is
sometimes used for squamous cell carcinoma in situ (involving only the epidermis) and
for very superficial basal cell carcinomas (those only on the surface of the skin). It is not
yet known if this type of treatment is as effective as standard methods of treatment, and it
is not widely used.
Radiation therapy 
Radiation therapy uses high-energy rays (such as x-rays) or particles (such as photons,
electrons, or protons) to kill cancer cells. External beam radiation therapy focuses
radiation from outside the body on the skin tumor. The treatment is much like getting an
x-ray, but the radiation is more intense. The procedure itself is painless. Each treatment
lasts only a few minutes, although the setup time – getting you into place for treatment –
takes longer.
If a tumor is very large or is on an area of the skin that makes surgery difficult, radiation
may be used as the primary (main) treatment instead of surgery. Primary radiation
therapy is often useful for some elderly patients who, because of poor general health,

cannot tolerate surgery. Radiation therapy can cure small non-melanoma skin cancers and
can delay the growth of more advanced cancers. Radiation is also useful in combination
with other therapies. It is particularly useful for Merkel cell carcinoma.
In some cases, radiation can be used after surgery as adjuvant (additional) therapy to kill
any small deposits of remaining cancer cells that may not have been visible during
surgery. This lowers the risk of cancer coming back after surgery. Radiation may also be

used to help treat non-melanoma skin cancer that has spread to lymph nodes or other
organs.
Side effects of radiation can include skin irritation, redness, drying, and hair loss in the
area being treated. With longer treatments, these side effects may get worse. After many
years, new skin cancers sometimes arise in areas previously treated by radiation. For this
reason, radiation usually is not used to treat skin cancer in young people. Radiation is
also not recommended for people with certain inherited conditions (such as basal cell
nevus syndrome or xeroderma pigmentosum), who may be at higher risk for new cancers,
or for people with connective tissue diseases (such as lupus or scleroderma), which
radiation might make worse.
For more general information about radiation therapy, please see our document called
Understanding Radiation Therapy: A Guide for Patients and Families.
Systemic chemotherapy 
Systemic chemotherapy uses anti-cancer drugs that are injected into a vein or given by
mouth. These drugs travel through the bloodstream to all parts of the body. In contrast to
topical chemotherapy, systemic chemotherapy can attack cancer cells that have spread to
lymph nodes and other organs.
One or more chemotherapy drugs may be used to treat squamous cell carcinoma or
Merkel cell carcinoma that has spread to other organs. Chemotherapy drugs such as
cisplatin, doxorubicin, 5-fluorouracil (5-FU), topotecan, and etoposide are given
intravenously (into a vein), usually once every few weeks. They can often delay the
spread of these cancers and relieve some symptoms. In some cases, they may shrink
tumors enough so that other treatments such as surgery or radiation therapy can be used.
Chemotherapy drugs attack cells that are dividing quickly, which is why they work
against cancer cells. But other cells in the body, such as those in the bone marrow, the
lining of the mouth and intestines, and the hair follicles, also divide quickly. These cells
are also likely to be affected by chemotherapy, which can lead to side effects.
The side effects of chemotherapy depend on the type and dose of drugs given and the
length of time they are taken. These side effects may include:
• Hair loss
• Mouth sores
• Loss of appetite

• Nausea and vomiting
• Diarrhea
• Increased risk of infection (due to low white blood cell counts)
• Easy bruising or bleeding (due to low blood platelets)

• Fatigue (due to low red blood cells)
These side effects are usually short-term and go away once treatment is finished. Some
drugs may have specific effects that are not listed above, so be sure to talk with your
cancer care team about what you might expect in terms of side effects.
There are often ways to lessen these side effects. For example, drugs can be given to help
prevent or reduce nausea and vomiting. Do not hesitate to discuss any questions about
side effects with the cancer care team.
You should tell your medical team about any side effects or changes you notice while
getting chemotherapy so that they can be treated promptly.
For more general information about chemotherapy, please see our document called
Understanding Chemotherapy: A Guide for Patients and Families.
Clinical trials 
You may have had to make a lot of decisions since you've been told you have cancer.
One of the most important decisions you will make is choosing which treatment is best
for you. You may have heard about clinical trials being done for your type of cancer. Or
maybe someone on your health care team has mentioned a clinical trial to you.
Clinical trials are carefully controlled research studies that are done with patients who
volunteer for them. They are done to get a closer look at promising new treatments or
procedures.
If you would like to take part in a clinical trial, you should start by asking your doctor if
your clinic or hospital conducts clinical trials. You can also call our clinical trials
matching service for a list of clinical trials that meet your medical needs. You can reach
this service at 1-800-303-5691 or on our Web site at www.cancer.org/clinicaltrials. You
can also get a list of current clinical trials by calling the National Cancer Institute's
Cancer Information Service toll-free at 1-800-4-CANCER (1-800-422-6237) or by
visiting the NCI clinical trials Web site at www.cancer.gov/clinicaltrials.
There are requirements you must meet to take part in any clinical trial. If you do qualify
for a clinical trial, it is up to you whether or not to enter (enroll in) it.
Clinical trials are one way to get state-of-the art cancer treatment. They are the only way
for doctors to learn better methods to treat cancer. Still, they are not right for everyone.
You can get a lot more information on clinical trials in our document called Clinical
Trials: What You Need to Know. You can read it on our Web site or call our toll-free
number (1-800-227-2345) and have it sent to you.
Complementary and alternative therapies
When you have cancer you are likely to hear about ways to treat your cancer or relieve
symptoms that your doctor hasn't mentioned. Everyone from friends and family to
Internet groups and Web sites may offer ideas for what might help you. These methods

can include vitamins, herbs, and special diets, or other methods such as acupuncture or
massage, to name a few.
What exactly are complementary and alternative therapies?
Not everyone uses these terms the same way, and they are used to refer to many different
methods, so it can be confusing. We use complementary to refer to treatments that are
used along with your regular medical care. Alternative treatments are used instead of a
doctor's medical treatment.
Complementary methods: Most complementary treatment methods are not offered as
cures for cancer. Mainly, they are used to help you feel better. Some methods that are
used along with regular treatment are meditation to reduce stress, acupuncture to help
relieve pain, or peppermint tea to relieve nausea. Some complementary methods are
known to help, while others have not been tested. Some have been proven not to be
helpful, and a few have even been found harmful.
Alternative treatments: Alternative treatments may be offered as cancer cures. These
treatments have not been proven safe and effective in clinical trials. Some of these
methods may pose danger, or have life-threatening side effects. But the biggest danger in
most cases is that you may lose the chance to be helped by standard medical treatment.
Delays or interruptions in your medical treatments may give the cancer more time to
grow and make it less likely that treatment will help.
Finding out more 
It is easy to see why people with cancer think about alternative methods. You want to do
all you can to fight the cancer, and the idea of a treatment with few or no side effects
sounds great. Sometimes medical treatments like chemotherapy can be hard to take, or
they may no longer be working. But the truth is that most of these alternative methods
have not been tested and proven to work in treating cancer.
As you consider your options, here are 3 important steps you can take: 
• Look for "red flags" that suggest fraud. Does the method promise to cure all or most
cancers? Are you told not to have regular medical treatments? Is the treatment a
"secret" that requires you to visit certain providers or travel to another country?
• Talk to your doctor or nurse about any method you are thinking about using.
• Contact us at 1-800-227-2345 to learn more about complementary and alternative
methods in general and to find out about the specific methods you are looking at.








How are basal and squamous cell skin cancers staged?


Staging is a process of finding out how widespread a cancer is. Because basal cell cancer
is almost always cured before it spreads to other organs, it is seldom staged unless the
cancer is very large. Squamous cell cancers have a somewhat greater (although still quite
small) risk of spreading, so staging may sometimes be done, particularly in people who
have a high risk of spread. This includes people with suppressed immune systems, such
as those who have had organ transplants and people infected with HIV, the virus that
causes AIDS.
The tests and exams described in the section called “How are basal and squamous cell
skin cancers diagnosed?” are the main ones used to help determine the stage of the
cancer. In rare cases, imaging tests such as x-rays, CT scans, or MRI scans may be used
as well.

The American Joint Committee on Cancer (AJCC) TNM 
system 
A staging system is a way to summarize how far a cancer has spread. This helps members
of the cancer care team determine a patient's prognosis (outlook) as well as the best
treatment options.
The system most often used to stage basal and squamous cell skin cancers is the
American Joint Commission on Cancer (AJCC) TNM system. (Merkel cell carcinoma
has a separate AJCC staging system, which is not described here.)
Physical exams and other tests may be used to assign T, N, and M categories and a
grouped stage. The TNM system for staging contains 3 key pieces of information:
T stands for tumor (its size, location, and how far it has spread within the skin and to
nearby tissues).
N stands for spread to nearby lymph nodes (small bean-shaped collections of immune
system cells, to which cancers often spread first).
M is for metastasis (spread to distant organs).
T categories 
The possible values for T are:
TX: Primary tumor cannot be assessed.
T0: No evidence of primary tumor.
Tis: Carcinoma in situ (tumor is still confined to the epidermis).
T1: The tumor is 2 centimeters (cm) across (about 4/5 inch) or smaller and has no or only
1 high-risk feature (see below).

T2: Tumor is larger than 2 cm across, or is any size with 2 or more high-risk features.
T3: Tumor invades into facial bones, such as the jaw bones or bones around the eye.
T4: Tumor invades into other bones in the body or into the base of the skull.
High-risk features: These features are used to distinguish between some T1 and T2
tumors.
Tumor is thicker than 2 millimeters (mm).
Tumor has invaded down into the lower dermis or subcutis (Clark level IV or V).
Tumor has invaded into tiny nerves in the skin (perineural invasion).
Tumor started on an ear or on hair-bearing lip.

• Tumor cells look very abnormal (poorly differentiated or undifferentiated) when
viewed under a microscope.
N categories
The possible values for N are: 
NX: Nearby lymph nodes cannot be assessed.
N0: No spread to nearby lymph nodes.

and other organs in the body is combined in a process called stage grouping. The stages
are described using the number 0 and Roman numerals from I to IV. In general, patients
with lower stage cancers tend to have a better prognosis for a cure or long-term survival.
Stage 0  Tis, N0, M0
Stage I  T1, N0, M0
Stage II  T2, N0, M0
Stage III  T3, N0, M0
T1 to T3, N1, M0
Stage IV  T1 to T3, N2, M0

N1: Spread to 1 nearby lymph node which is on the same side of the body as the main
tumor and is 3 centimeters (cm) or less across.
N2a: Spread to 1 nearby lymph node which is on the same side of the body as the main
tumor and is larger than 3 cm but not larger than 6 cm across.
N2b: Spread to more than 1 nearby lymph node on the same side of the body as the main
tumor, none of which are larger than 6 cm across.
N2c: Spread to nearby lymph node(s) on the other side of the body from the main tumor,
none of which are larger than 6 cm across.
N3: Spread to any nearby lymph node that is larger than 6 cm across.
M categories
The M values are:
M0: No spread to distant organs.
M1: Spread to distant organs.
Stage grouping 
To assign a stage, information about the tumor and whether it has spread to lymph nodes


and other organs in the body is combined in a process called stage grouping. The stages
are described using the number 0 and Roman numerals from I to IV. In general, patients
with lower stage cancers tend to have a better prognosis for a cure or long-term survival.
Stage 0  Tis, N0, M0
Stage I  T1, N0, M0
Stage II  T2, N0, M0
Stage III  T3, N0, M0
T1 to T3, N1, M0
Stage IV  T1 to T3, N2, M0

Any T, N3, M0
T4, any N, M0
Any T, any N, M1


How are basal and squamous cell skin cancers diagnosed?


If an abnormal area of skin raises the possibility of skin cancer, certain medical exams
and tests such as a biopsy may be used to find out if it is cancer or some other skin
condition. If there is a chance the skin cancer may have spread to other areas of the body,
other tests may be done as well.
Signs and symptoms of basal and squamous cell skin 
cancers 
Skin cancers rarely cause bothersome symptoms until they become quite large. Then they
may bleed or even hurt. But typically they can be seen or felt long before they reach this
point.
Basal cell carcinomas often appear as flat, firm, pale areas or small, raised, pink or red,
translucent, shiny, waxy areas that may bleed after a minor injury. They may have one or
more abnormal blood vessels, a lower area in their center, and/or blue, brown, or black
areas. Large basal cell carcinomas may have oozing or crusted areas. They usually
develop on areas exposed to the sun, especially the head and neck, but they can occur
anywhere on the body.
Squamous cell carcinomas may appear as growing lumps, often with a rough, scaly, or
crusted surface. They may also look like flat reddish patches in the skin that grow slowly.
They commonly occur on sun-exposed areas of the body such as the face, ear, neck, lip,
and back of the hands. Less often, they form in the skin of the genital area. They can also
develop in scars or skin sores elsewhere.
Both of these types of skin cancer may develop as a flat area showing only slight changes
from normal skin.
Skin cancers other than melanoma, basal cell carcinoma, and squamous cell carcinoma
are much less common, and may look different.

• Kaposi sarcoma generally starts as small bruise-like areas that develop into reddish or
purplish tumors under the skin.
• Mycosis fungoides (a type of lymphoma that starts in the skin) usually begins as a
rash, often on the buttocks, hips, or lower abdomen. It can look like skin allergies and
other types of skin irritations.
• Adnexal tumors appear as bumps within the skin.
• Skin sarcomas appear as large masses under the skin surface.
• Merkel cell tumors are usually firm, pink, red, or purple nodules or ulcers (sores)
found on the face or, less often, the arms or legs.
If your doctor suspects you might have skin cancer, he or she will use one or more of the
following tests or exams.

Medical history and physical exam 
Usually the doctor's first step is to take your medical history (asking questions about
symptoms and risk factors). The doctor will ask when the mark on the skin first appeared
and whether it has changed in size or appearance. You may also be asked about past
exposures to possible causes of skin cancer (including past sunburns and tanning
practices) and whether you or anyone in your family has had skin cancer.
During the physical exam, the doctor will note the size, shape, color, and texture of the
area(s) in question, and whether there is bleeding or scaling. The rest of your body may
be checked for spots and moles that may be related to skin cancer.
The doctor may also check nearby lymph nodes, which are bean-sized collections of
immune system cells that can be felt under the skin in certain areas. Some skin cancers
may spread to lymph nodes. When this happens, the lymph nodes may become larger and
firmer than usual.
If you are being seen by your primary doctor and skin cancer is suspected, you may be
referred to a dermatologist (a doctor who specializes in skin diseases), who will look at
the area more closely.
Along with a standard physical exam, some dermatologists use a technique called
dermatoscopy (also known as dermoscopy, epiluminescence microscopy [ELM] or
surface microscopy) to see spots on the skin more clearly. The doctor uses a
dermatoscope, which is a special magnifying lens and light source held near the skin.
Sometimes a thin layer of oil is used with this instrument. A digital or photographic
image of the spot may be taken.
When used by an experienced dermatologist, this test can improve the accuracy of
finding skin cancers early. It can also often help reassure you that a lesion is likely benign
(non-cancerous) without the need for a biopsy.

Skin biopsy 
If the doctor thinks that a suspicious area might be skin cancer, he or she will take a
sample of skin from the area to be looked at under a microscope. This is called a skin
biopsy. If the biopsy removes the entire tumor, it is often enough to cure basal and
squamous cell skin cancers without further treatment.
Different methods can be used for a skin biopsy. The choice depends on the suspected
type of skin cancer, where it is on your body, the size of the affected area, and other
factors. Any biopsy is likely to leave at least a small scar. Different methods produce
different scars, so if you are concerned ask your doctor about possible scarring before the
biopsy is done.
Skin biopsies are done using a local anesthetic (numbing medicine), which is injected
into the area with a very small needle. You will likely feel a small prick and a little
stinging as the medicine is injected, but you should not feel any pain during the biopsy.
Shave biopsy 
A shave biopsy is one way to take a skin biopsy. After numbing the area with a local
anesthetic, the doctor shaves off the top layers of the skin (the epidermis and the most
superficial part of the dermis) with a surgical blade.
Punch biopsy 
A punch biopsy removes a deeper sample of skin. The doctor uses a tool that looks like a
tiny round cookie cutter. Once the skin is numbed with a local anesthetic, the doctor
rotates the punch biopsy tool on the surface of the skin until it cuts through all the layers
of the skin, including the dermis, epidermis, and the upper parts of the subcutis.

Incisional and excisional biopsies 
To examine a tumor that may have grown into deeper layers of the skin, the doctor may
use an incisional or excisional biopsy technique. After numbing the area with a local
anesthetic, a surgical knife is used to cut through the full thickness of skin. A wedge or
sliver of skin is removed for examination, and the edges of the wound are stitched
together.
An incisional biopsy removes only a portion of the tumor. An excisional biopsy removes
the entire tumor.
Examining the biopsy samples 
All skin biopsy samples are looked at under a microscope by a pathologist, a doctor
trained in the examination and diagnosis of tissue samples. Often, the sample is sent to a
dermatopathologist, a doctor who has special training in making diagnoses from skin
samples.

Lymph node biopsy 
In uncommon cases where skin cancer spreads, it usually goes first to nearby lymph
nodes, which are small, bean-shaped collections of immune cells. If your doctor feels
lymph nodes near the tumor that are too large and/or too firm, a lymph node biopsy may
be done to determine whether cancer has spread to them.
Fine needle aspiration biopsy 
A fine needle aspiration (FNA) biopsy uses a syringe with a thin, hollow needle to
remove very small tissue fragments. The needle is smaller than the needle used for a
blood test. A local anesthetic is sometimes used to numb the area first. This test rarely
causes much discomfort and does not leave a scar.
An FNA biopsy is not used to diagnose a suspicious skin tumor, but it may be used to
biopsy large lymph nodes near a skin cancer to find out if the cancer has spread to them.
FNA biopsies are not as invasive as some other types of biopsies, but they may not
always provide enough of a sample to find cancer cells.
Surgical (excisional) lymph node biopsy 
If the doctor still suspects spread of cancer to a lymph node after an FNA does not find
cancer, the lymph node will be removed by surgery and examined. This can often be
done in a doctor's office or outpatient surgical center using local anesthesia and will leave
a small scar.





Can basal and squamous cell skin cancers be prevented?


Not all basal and squamous cell skin cancers can be prevented, but there are things you
can do that may reduce your risk of getting skin cancer.
Limit ultraviolet (UV) exposure
The most important way to lower your risk of basal and squamous cell skin cancers is to
limit your exposure to UV radiation. Practice sun safety when you are outdoors. "Slip!
Slop! Slap!… and Wrap" is a catch phrase that can help you remember the 4 key steps
you can take to protect yourself from UV rays:
• Slip on a shirt.
• Slop on sunscreen.
• Slap on a hat.
• Wrap on sunglasses to protect the eyes and sensitive skin around them.
Protect your skin with clothing
Clothes provide different levels of UV protection, depending on many factors. Longsleeved shirts, long pants, or long skirts are the most protective. Dark colors generally
provide more protection than light colors. A tightly woven fabric protects better than
loosely woven clothing. Dry fabric is generally more protective than wet fabric.
Be aware that covering up doesn't block out all UV rays. If you can see light through a
fabric, UV rays can get through too.
Some companies in the United States now make clothing that is lightweight, comfortable,
and protects against UV exposure even when wet. These sun-protective clothes may have
a label listing the ultraviolet protection factor (UPF) value – the level of protection the
garment provides from the sun's UV rays (on a scale from 15 to 50+). The higher the
UPF, the higher the protection from UV rays.
Newer products, which are used in the washing machine like laundry detergents, can
increase the UPF value of clothes you already own. They add a layer of UV protection to
your clothes without changing the color or texture.
Wear a hat
A hat with at least a 2- to 3-inch brim all around is ideal because it protects areas often
exposed to intense sun, such as the ears, eyes, forehead, nose, and scalp. A shade cap
(which looks like a baseball cap with about 7 inches of fabric draping down the sides andback) also is good, and will provide more protection for the neck. These are often sold in
sports and outdoor supply stores.
A baseball cap can protect the front and top of the head but not the neck or the ears,
where skin cancers commonly develop. Straw hats are not as protective as ones made of
tightly woven fabric.


Use sunscreen
Use sunscreens and lip balms on areas of skin exposed to the sun, especially when the
sunlight is strong (for example, between the hours of 10 am and 4 pm). Many groups,
including the American Academy of Dermatology, recommend using products with a sun
protection factor (SPF) of 30 or more. Use sunscreen even on hazy days or days with
light or broken cloud cover because the UV light still comes through.
Always follow directions when applying sunscreen. Ideally, a 1-ounce application (a
palmful of sunscreen) is recommended to cover the arms, legs, neck, and face of the
average adult. Protection is greatest when sunscreen is used thickly on all sun-exposed
skin. To ensure continued protection, sunscreens should be reapplied. It is often
recommended to do so every 2 hours. Many sunscreens wash off when you sweat or
swim and then wipe off with a towel, so they must be reapplied for maximum
effectiveness. And don't forget your lips; lip balm with sunscreen is also available.
Some people use sunscreen because they want to stay out in the sun for long periods of
time without getting sunburned. Sunscreen should not be used to spend more time in the
sun than you otherwise would, as you will still end up with damage to your skin.
Sunscreen can reduce your chance of actinic keratoses and squamous cell cancer. But
there is no guarantee, and if you stay in the sun a long time, you are at risk of developing
skin cancer even if you have applied sunscreen.
If you want a tan, one option is using a sunless tanning lotion. These can provide the
look, without the danger. Sunless tanning lotions contain a substance called
dihydroxyacetone (DHA). DHA works by interacting with proteins on the surface of the
skin to produce color. You do not have to go out in the sun for these to work. The color
tends to wear off after a few days. Most sunless tanning lotions provide very little
protection from UV rays, so if you use one, you should still use sunscreen and wear
protective clothing when going outside.
Wear sunglasses
Wrap-around sunglasses with at least 99% UV absorption provide the best protection for
the eyes and the skin area around the eyes. Look for sunglasses labeled as blocking UVA
and UVB light. Labels that say "UV absorption up to 400 nm" or "Meets ANSI UV
Requirements" mean the glasses block at least 99% of UV rays. If there is no label, don't
assume the sunglasses provide any protection.


Seek shade  
Another way to limit exposure to UV light is to avoid being outdoors in direct sunlight
too long. This is particularly important in the middle of the day between the hours of 10
am and 4 pm, when UV light is strongest. If you are unsure about the sun's intensity, use
the shadow test: if your shadow is shorter than you are, the sun's rays are the strongest,
and it is important to protect yourself..
When you are outdoors, protect your skin. Keep in mind that sunlight (and UV rays) can
come through light clouds, can reflect off water, sand, concrete, and snow, and can reach
below the water's surface.
The UV Index: The amount of UV light reaching the ground in any given place depends
on a number of factors, including the time of day, time of year, elevation, and cloud
cover. To help people better understand the intensity of UV light in their area on a given
day, the National Weather Service and the US Environmental Protection Agency have
developed the UV Index. It gives people an idea of how strong the UV light is in their
area, on a scale from 1 to 11+. A higher number means a higher chance of sunburn, skin
damage, and ultimately skin cancers of all kinds. Your local UV Index should be
available daily in your local newspaper, on TV weather reports, and online
(www.epa.gov/sunwise/uvindex.html).
Avoid tanning beds and sunlamps
Many people believe the UV rays of tanning beds are harmless. This is not true. Tanning
lamps give out UVA and usually UVB rays as well, both of which can cause long-term
skin damage and can contribute to skin cancer. Most skin doctors and health
organizations recommend not using tanning beds and sun lamps.
Protect children from the sun 
Children need special attention, since they tend to spend more time outdoors and can
burn more easily. Parents and other caregivers should protect children from excess sun
exposure by using the steps above. Older children need to be cautioned about sun
exposure as they become more independent. It is important, particularly in parts of the
world where it is sunnier, to cover your children as fully as is reasonable. You should
develop the habit of using sunscreen on exposed skin for yourself and your children whenever you go outdoors and may be exposed to large amounts of sunlight.
Babies younger than 6 months should be kept out of direct sunlight and protected from
the sun using hats and protective clothing. Sunscreen may be used on small areas of
exposed skin only if adequate clothing and shade are not available.
A word about sun exposure and vitamin D 
Doctors are learning that vitamin D has many health benefits. It may even help to lower
the risk for some cancers. Vitamin D is made naturally by your skin when you are in the

sun. How much vitamin D you make depends on many things, including how old you are,
how dark your skin is, and how intensely the sun shines where you live.
At this time, doctors aren't sure what the optimal level of vitamin D is. A lot of research
is being done in this area. Whenever possible, it is better to get vitamin D from your diet
or vitamin supplements rather than from sun exposure, because dietary sources and
vitamin supplements do not increase risk for skin cancer, and are typically more reliable
ways to get the amount you need.
For more information on how to protect yourself and your family from UV exposure, see
our document called Skin Cancer: Prevention and Early Detection.
Avoid harmful chemicals 
Exposure to certain chemicals, such as arsenic, can increase a person's risk of skin cancer.
People can be exposed to arsenic from well water in some areas, pesticides and
herbicides, some medicines (such as arsenic trioxide) and herbal remedies (arsenic has
been found in some traditional herbal remedies imported from China), and in certain
occupations (such as mining and smelting).
Learn more about skin cancer prevention 
Many organizations conduct skin cancer prevention activities in schools and recreational
areas. Others develop brochures and public service announcements. For more
information, refer to the “Additional resources” section of this document.

Can basal and squamous cell skin cancers be found early?

Basal cell and squamous cell skin cancers can be found early. As part of a routine cancer-related checkup, your health care professional should check your skin carefully. He or she should be willing to discuss any doubts or concerns you might have about this exam.
You can also play an important role in finding skin cancer early. It's important to check all over your skin, preferably once a month. Learn the patterns of moles, blemishes, freckles, and other marks on your skin so that you'll notice any changes. Self-exams are best done in a well-lit room in front of a full-length mirror. A hand-held mirror can be used for areas that are hard to see.
All areas should be examined, including your palms and soles, scalp, ears, nails, and your back. (For a more thorough description of a skin self-exam, see our document called Skin Cancer: Prevention and Early Detection and the booklet "Why You Should Know About Melanoma.") Friends and family members can also help you with these exams, especially for those hard-to-see areas, such as the lower back or the back of your thighs. Be sure to show your doctor any area that concerns you.
Spots on the skin that are new or changing in size, shape, or color should be seen by a doctor promptly. Any unusual sore, lump, blemish, marking, or change in the way an area of the skin looks or feels may be a sign of skin cancer or a warning that it might occur. The skin might become scaly or crusty or begin oozing or bleeding. It may feel itchy, tender, or painful. Redness and swelling may develop.
Basal cell and squamous cell skin cancers can look like a variety of marks on the skin. The key warning signs are a new growth, a spot or bump that's getting larger (over a few months or 1 to 2 years), or a sore that doesn't heal within 2 months. (See the next section, “How are basal and squamous cell skin cancers diagnosed?” for a more detailed description of what to look for.)

What are the risk factors for basal and squamous cell skin cancers?

A risk factor is anything that affects your chance of getting a disease such as cancer. Different cancers have different risk factors. For example, smoking is a risk factor for cancers of the lung, mouth, throat, kidneys, bladder, and several other organs.
But risk factors don't tell us everything. Having a risk factor, or even several risk factors, does not mean that you will get the disease. And many people who get the disease may not have had any known risk factors. Even if a person with basal or squamous cell skin cancer has a risk factor, it is often very hard to know how much that risk factor may have contributed to the cancer.
The following are known risk factors for basal cell and squamous cell carcinomas. (These factors don't necessarily apply to other forms of non-melanoma skin cancer, such as Kaposi sarcoma and cutaneous lymphoma.)

Ultraviolet (UV) light exposure

Ultraviolet (UV) radiation is thought to be the major risk factor for most skin cancers. Sunlight is the main source of UV rays, which can damage the genes in your skin cells. Tanning lamps and beds are another source of UV radiation. People with high levels of exposure to light from these sources are at greater risk for skin cancer.
Ultraviolet radiation is divided into 3 wavelength ranges:
  • UVA rays cause cells to age and can cause some damage to cells' DNA. They are mainly linked to long-term skin damage such as wrinkles, but are also thought to play a role in some skin cancers.
  • UVB rays can cause direct damage to the DNA, and are the main rays that cause sunburns. They are also thought to cause most skin cancers.
  • UVC rays don't get through our atmosphere and therefore are not present in sunlight. They are not normally a cause of skin cancer.
While UVA and UVB rays make up only a very small portion of the sun's wavelengths, they are the main cause of the damaging effects of the sun on the skin. UV radiation damages the DNA of skin cells. Skin cancers begin when this damage affects the DNA of genes that control skin cell growth. Both UVA and UVB rays damage skin and cause skin cancer. UVB rays are a more potent cause of at least some skin cancers, but based on what is known today, there are no safe UV rays.
The amount of UV exposure depends on the strength of the rays, the length of time the skin is exposed, and whether the skin is protected with clothing or sunscreen.
People who live in areas with year-round, bright sunlight have a higher risk. For example, the risk of skin cancer is twice as high in Arizona compared to Minnesota. The highest rate of skin cancer in the world is in Australia. Spending a lot of time outdoors for work or recreation without protective clothing and sunscreen increases your risk.
Many studies also point to exposure at a young age (for example, frequent sunburns during childhood) as an added risk factor.

Having fair skin

The risk of skin cancer is much higher for whites than for African Americans or Hispanics. This is due to the protective effect of melanin (skin pigment) in people with darker skin. Whites with fair (light-colored) skin that freckles or burns easily are at especially high risk. This is another reason for the high skin cancer rate in Australia, where much of the population descends from fair-skinned immigrants from the British Isles.
Albinism is a congenital (present at birth) absence of skin pigment. People with this condition may have pink-white skin and white hair. They have a high risk of getting skin cancer unless they are careful to protect their skin.

Older age

The risk of basal and squamous cell skin cancers goes up as people get older. This is probably because of accumulated sun exposure over time. These cancers are now being seen in younger people as well, probably because they are spending more time in the sun with their skin exposed.

Male gender

Men are about 2 times as likely as women to have basal cell cancers and about 3 times as likely to have squamous cell cancers of the skin. This is thought to be due mainly to higher levels of sun exposure.

Exposure to certain chemicals

Exposure to large amounts of arsenic increases the risk of developing skin cancer. Arsenic is a heavy metal found naturally in well water in some areas. It is also used in making some pesticides.
Workers exposed to industrial tar, coal, paraffin, and certain types of oil may also have an increased risk for non-melanoma skin cancer.

Radiation exposure

People who have had radiation treatment have a higher risk of developing skin cancer in the area that received the treatment. This is particularly a concern in children who have had radiation treatment for cancer.

Previous skin cancer

Anyone who has had a keratinocyte cancer has a much higher chance of developing another one.

Long-term or severe skin inflammation or injury

Scars from severe burns, areas of skin over severe bone infections, and skin damaged by some severe inflammatory skin diseases are more likely to develop keratinocyte skin cancers, although this risk is generally small.

Psoriasis treatment

Psoralen and ultraviolet light treatments (PUVA) given to some patients with psoriasis (a long-lasting inflammatory skin disease) can increase the risk of developing squamous cell skin cancer and probably other skin cancers also.

Xeroderma pigmentosum (XP)

This very rare inherited condition reduces the skin's ability to repair damage to DNA caused by sun exposure. People with this disorder often develop many skin cancers starting in childhood.

Basal cell nevus syndrome (Gorlin syndrome)

In this rare congenital (present at birth) condition, people develop many basal cell cancers over their lifetimes. Most, but not all, cases are inherited. Affected people may also have abnormalities of the jaw and other bones, eyes, and nervous tissue. In families with this syndrome, those affected often begin developing basal cell cancers when they are young (under age 20).

Reduced immunity

The immune system helps the body fight cancers of the skin and other organs. People with weakened immune systems (due to certain diseases or medical treatments) are more likely to develop non-melanoma skin cancer, including squamous cell cancer and less common types such as Kaposi sarcoma and Merkel cell carcinoma.
For example, organ transplant patients are usually given medicines that weaken their immune system to prevent their body from rejecting the new organ. This increases their risk of developing skin cancer. The rate of skin cancer in people who have had transplants can be as high as 70% within 20 years after the transplant. Skin cancers in people with weakened immune systems tend to grow faster and are more likely to be fatal.
Treatment with large doses of corticosteroid drugs can also depress the immune system. This may also increase a person's risk of skin cancer.

Human papilloma virus (HPV) infection

Human papilloma viruses (HPVs) are a group of more than 100 viruses that can cause papillomas, or warts. The warts that people commonly get on their hands and feet appear to be unrelated to any form of cancer. But some of the HPV types, especially those that people get in their genital and anal area, appear to be related to skin cancers in these areas.

Smoking

People who smoke are more likely to develop squamous cell skin cancer, especially on the lips. Smoking is not a known risk factor for basal cell cancer.

What are basal and squamous cell skin cancers?


To understand basal and squamous cell skin cancers, it helps to know about the normal 
structure and function of the skin.  
Normal skin 
The skin is the largest organ in your body. It does several different things: 
• Covers the internal organs and protects them from injury 
• Serves as a barrier to germs such as bacteria 
• Prevents the loss of too much water and other fluids 
• Helps control body temperature 
• Protects the rest of the body from ultraviolet (UV) rays 
• Helps the body make vitamin D 
The skin has 3 layers: the epidermis, the dermis, and the subcutis (see picture). 
Epidermis 
The top layer of skin is the epidermis. The epidermis is thin, averaging only 0.2 
millimeters thick (about 1/100 of an inch). It protects the deeper layers of skin and the 
organs of the body from the environment.

Keratinocytes are the main cell type of the epidermis. These cells make an important 
protein called keratin. Keratin helps the skin protect the rest of the body.  
The outermost part of the epidermis is called the stratum corneum, or horny layer. It is 
composed of dead keratinocytes that are continually shed as new ones form. The cells in 
this layer are called squamous cells because of their flat shape. 
Living squamous cells are found just below the stratum corneum. These cells have moved 
here from the lowest part of the epidermis, the basal layer. The cells of the basal layer, 
called basal cells, continually divide to form new keratinocytes. These replace the older 
keratinocytes that wear off the skin's surface.  
Cells called melanocytes are also found in the epidermis. These skin cells make the 
brown pigment called melanin. Melanin is what gives the skin its tan or brown color. It 
protects the deeper layers of the skin from some of the harmful effects of the sun. When 
skin is exposed to the sun, melanocytes make more of the pigment, causing the skin to tan 
or darken. 
The epidermis is separated from the deeper layers of skin by the basement membrane. 
The basement membrane is an important structure because when a skin cancer becomes 
more advanced, it generally grows through this barrier. 
Dermis 
The middle layer of the skin is called the dermis. The dermis is much thicker than the 
epidermis. It contains hair follicles, sweat glands, blood vessels, and nerves that are held 
in place by a protein called collagen. Collagen, made by cells called fibroblasts, gives the 
skin its resilience and strength. 



Subcutis 
The deepest layer of the skin is called the subcutis. The subcutis and the lowest part of 
the dermis form a network of collagen and fat cells. The subcutis helps the body conserve 
heat and has a shock-absorbing effect that helps protect the body's organs from injury. 
Types of skin cancer 
Melanomas 
Cancers that develop from melanocytes, the pigment-making cells of the skin, are called 
melanomas. Melanocytes can also form benign growths called moles. Melanoma and 
moles are discussed in our document called Melanoma Skin Cancer.  
Skin cancers that are not melanoma are sometimes grouped together as non-melanoma 
skin cancers because they tend to act very differently from melanomas. 
Keratinocyte cancers  
These are by far the most common non-melanoma skin cancers. They are called 
keratinocyte carcinomas or keratinocyte cancers because when seen under a microscope, 
their cells share some features of keratinocytes, the most abundant cell type of normal 
skin. The most common types of keratinocyte cancer are basal cell carcinoma and 
squamous cell carcinoma.  

Subcutis 
The deepest layer of the skin is called the subcutis. The subcutis and the lowest part of 
the dermis form a network of collagen and fat cells. The subcutis helps the body conserve 
heat and has a shock-absorbing effect that helps protect the body's organs from injury. 
Types of skin cancer 
Melanomas 
Cancers that develop from melanocytes, the pigment-making cells of the skin, are called 
melanomas. Melanocytes can also form benign growths called moles. Melanoma and 
moles are discussed in our document called Melanoma Skin Cancer.  
Skin cancers that are not melanoma are sometimes grouped together as non-melanoma 
skin cancers because they tend to act very differently from melanomas. 
Keratinocyte cancers  
These are by far the most common non-melanoma skin cancers. They are called 
keratinocyte carcinomas or keratinocyte cancers because when seen under a microscope, 
their cells share some features of keratinocytes, the most abundant cell type of normal 
skin. The most common types of keratinocyte cancer are basal cell carcinoma and 
squamous cell carcinoma.  
Basal cell carcinoma 
When seen under a microscope, these cancers share features with the cells in the lowest 
layer of the epidermis, called the basal cell layer.  
About 8 out of 10 skin cancers are basal cell carcinomas (also called basal cell cancers). 
They usually develop on sun-exposed areas, especially the head and neck. Basal cell 
carcinoma was once found almost exclusively in middle-aged or older people. Now it is 
also being seen in younger people, probably because they are spending more time in the 
sun with their skin exposed.  
Basal cell carcinoma tends to be slow growing. It is very rare for a basal cell cancer to 
spread to nearby lymph nodes or to distant parts of the body. But if a basal cell cancer is 
left untreated, it can grow into nearby areas and invade the bone or other tissues beneath 
the skin.  
After treatment, basal cell carcinoma can recur (come back) in the same place on the 
skin. People who have had basal cell cancers are also more likely t

When seen under a microscope, these cancers share features with the cells in the lowest 
layer of the epidermis, called the basal cell layer.  
About 8 out of 10 skin cancers are basal cell carcinomas (also called basal cell cancers). 
They usually develop on sun-exposed areas, especially the head and neck. Basal cell 
carcinoma was once found almost exclusively in middle-aged or older people. Now it is 
also being seen in younger people, probably because they are spending more time in the 
sun with their skin exposed.  
Basal cell carcinoma tends to be slow growing. It is very rare for a basal cell cancer to 
spread to nearby lymph nodes or to distant parts of the body. But if a basal cell cancer is 
left untreated, it can grow into nearby areas and invade the bone or other tissues beneath 
the skin.  
After treatment, basal cell carcinoma can recur (come back) in the same place on the 
skin. People who have had basal cell cancers are also more likely t