Treatment Update: Merkel Cell Carcinoma

Treatment options for MCC often depend on whether the cancer has spread beyond the skin. You and your doctor will discuss the approach that is right for you, based on your individual circumstances. Often, treatment will consist of a sequence of therapies rather than just one approach.

Surgery

The tumor, along with a surrounding border of normal skin, is removed with a scalpel by a surgical oncologist. If diagnostic tests showed evidence that the MCC has spread to lymph nodes, those lymph nodes are also removed. This is called lymph node dissection.

Radiation

Radiation therapy is often administered after surgery to destroy small traces of cancer that could not be seen and removed during surgery. Radiation can also be used to treat the main tumor if surgery is not an option, and is a possible treatment approach if the MCC has spread to the lymph nodes or beyond.

If MCC recurs (returns) after initial treatment, it can be treated with external beam radiation therapy (EBRT), either alone or in combination with surgery or other treatment types. EBRT uses a machine that directs a beam (or multiple beams) of radiation to the tumor. The use of imaging tests allows radiation oncologists to accurately target the MCC, helping to spare healthy tissues.

Immunotherapy

Our immune system is constantly working to keep us healthy. It recognizes and fights against danger, such as infections, viruses and growing cancer cells. In general terms, immunotherapy uses our own immune system as a treatment against cancer. In 2017, the U.S. Food and Drug Administration (FDA) approved avelumab (Bavencio) for the treatment of MCC. Avelumab is an “immune checkpoint inhibitor” that works by targeting PD-L1, a protein that can prevent the body’s immune system from attacking tumors. It is given as an infusion into a vein.

Other immune checkpoint inhibitors, including nivolumab (Opdivo) and ipilimumab (Yervoy) are being studied in clinical trials for the treatment of MCC. Nivolumab works by blocking the PD-1 cellular pathway (a pathway that restricts the body’s immune system from attacking cancer cells). Ipilimumab blocks the action of a protein called CTLA-4. By doing do, it is thought to help the immune system destroy cancer cells.

Chemotherapy

Chemotherapy is the use of medication to treat cancer by stopping the ability of cancer cells to grow and divide. It is usually given intravenously (into a vein through a needle) or via a pill or capsule.

In the treatment of MCC, chemotherapy is most likely to be beneficial when the cancer has spread beyond the skin to other organs. However, it’s important to note that immunotherapy (not chemotherapy) is typically used us a firstline (initial) treatment for MCC that has spread beyond the skin.

The types of chemotherapy most often used to treat MCC include:

• Cisplatin (Platinol, Platinol AQ)
• Carboplatin (Paraplatin)
• Etoposide (Vepesid)
• Topotecan (Hycamtin)

A combination of chemotherapies may also be given, consisting of cyclophosphamide, doxorubicin and vincristine.

As you manage your MCC, it’s important to remember that you are a consumer of health care. The best way to make decisions about health care is to educate yourself about your diagnosis and get to know the members of your health care team, including doctors, nurses, nurse practitioners, physician assistants, dietitians, social workers and patient navigators.

Here are some tips for improving communication with your health care team:

Start a health care journal. Having a health care journal or notebook will allow you to keep all of your health information in one place. You may want to write down the names and contact information of the members of your health care team, as well as any questions for your doctor.

Prepare a list of questions. Before your next medical appointment, write down your questions and concerns. Because your doctor may have limited time, ask your most important questions first and be as specific as possible.

Bring someone with you to your appointments. Even if you have a journal and a prepared list of questions or concerns, it’s always helpful to have support when you go to your appointments. They may also think of questions to ask your doctor or remember details about your symptoms or treatment that you may have forgotten.

Write down your doctor’s answers. Taking notes will help you remember your doctor’s responses, advice and instructions. You can also ask the person who accompanies you to take notes for you, either in your journal or on a tablet or smartphone.

Record your visit if your doctor allows it. Recording the conversation with your doctor gives you a chance to hear specific information again or share it with family members or friends.

Incorporate other health care professionals into your team. Your medical oncologist is an essential member of your health care team, but there are other health care professionals who can help you manage your diagnosis and treatment:

• Your primary care physician should be kept updated about your cancer treatment and any test results.

• Your local pharmacist is a great source of knowledge about the medications you are taking. Have all of your prescriptions filled at the same pharmacy to avoid the possibility of harmful drug interactions.

• Make sure your oncologist knows of any other medical conditions you have or any pain you are experiencing so that they can consult with your primary care physician or specialists as needed.

Remember, there is no such thing as over-communication.

Q: What causes MCC?

A: Researchers have discovered that a virus, Merkel cell polyomavirus, plays a role in causing many cases of MCC. This virus, which lives on the skin, doesn’t cause any signs or symptoms. Given that this is a common virus and MCC is very rare (approximately 2,000 cases diagnosed in the United States annually), it’s likely that MCC has other causes (including sun exposure), not all of which are completely understood.

Q: Even if the causes of MCC are not fully understood, are there risk factors that increase its likelihood?

A: There are factors that may increase the risk of MCC, which include:

• Excessive exposure to ultraviolet light. Although MCC tumors can develop anywhere on the body, most appear on skin surfaces frequently exposed to the sun.
• Older age. While MCC can occur at any age, it is most common in people over the age of 50.
• A weakened immune system. People with weakened immune systems, either due to medicines that are being taken or because of another health condition, are more likely to develop MCC.
• History of other skin cancers. MCC is associated with a history of other skin cancers, such as basal cell or squamous cell carcinoma.
• Skin color. MCC usually occurs in people with light-colored skin.

Q: Does it matter at what hospital or health care facility my MCC treatment takes place?

1. The effective treatment and ongoing management of MCC almost always involves a multi-disciplinary approach, including the specialties of surgery, dermatology, radiation oncology and medical oncology. As MCC is rare, being treated by a team that is expert in the management of MCC is important. Resources can be found at www.merkelcell.org/resources/find-a-specialist.

Q. What is a treatment summary and why is important?

A: A treatment summary, sometimes called a “shadow chart,” is a document that you create and keep in your possession. Maintaining your own records allows you and your family members to have instant access to the specifics of your MCC diagnosis and treatment. A treatment summary should include:

• Your name and date of birth
• Date of diagnosis
• Prescribed therapy/therapies, including dates started and stopped and dosages when appropriate
• Dates and types of post-diagnosis testing, and the results of these tests
• Other medications and supplements you are taking
• Names, affiliations and contact information of all members of your health care team

Talk to your doctor or a member of your health care team about your intention to create a treatment summary, and ask what else they suggest be included. Take your treatment summary with you when you visit any doctor, not just your oncologist.