Knowledge Center

Cancer

What is cancer?

Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don’t need them, and old cells don’t die when they should. These extra cells can form a mass called a tumor.

Tumors can be benign or malignant. Benign tumors aren’t cancer, while malignant ones are. Cells from malignant tumors can invade nearby tissues. They can also break away and spread to other parts of your body. The spread of cancer from one part of the body to another is called metastasis. Symptoms and treatment depend on the type of cancer and how advanced it is.What are the types of cancer?

There are more than 100 different types of cancer. Cancer can start almost anywhere in your body. Most cancers are named for where they start. For example, lung cancer starts in the lung, and breast cancer starts in the breast.

Cancer may also be described by the type of cell that formed it, such as sarcoma if cancer begins in your bone and soft tissue. Carcinoma is the most common type of cancer. It is formed by epithelial cells, the cells that cover the inside and outside surfaces of your body.How does cancer develop?

Cancer is a genetic disease. That means changes in your genes cause it. Changes in your genes are also called gene variants or mutations. Genes are parts of DNA in your cells that you inherit from your parents. However, only some cancers are caused by genes passed down from your parents.

Genetic changes can occur to your genes over your lifetime that affect how your cells function. Usually, your body gets rid of damaged cells before they turn cancerous, but this ability goes down as you age. Other factors that may affect your risk of developing cancer can include:

• Exposure to ultraviolet (UV) rays from the sun
• Smoking
• Your diet
• Physical inactivity

What are the symptoms of cancer?

Cancer symptoms depend on the type of cancer. For example, some of the symptoms that cancer may cause can include:

• A lump in your breast
• Blood in your urine (pee) or stool (poop)
• Bleeding or bruising for no known reason
• A sore that doesn’t heal
• Trouble swallowing
• A new mole or a change to a mole you already have

Cancer may cause various symptoms but often doesn’t cause pain. Don’t wait until you’re having pain before seeing your health care provider. See your provider if you have symptoms that don’t get better in a few weeks.How is cancer diagnosed?

There is no single test that can diagnose cancer. The tests ordered are usually based on your symptoms. Your provider may:

• Ask about your medical history
• Ask about your family health history, including relatives who have had cancer
• Do a physical exam
• Do a screening test such as a mammogram, colonoscopy, or a Pap test
• Order blood tests or imaging tests

To find out if you have cancer, your provider may order a biopsy. A biopsy is the procedure of removing and examining tissue, cells, or fluids from your body.What are the treatments for cancer?

Treatment depends on the type of cancer and how advanced it is. Most treatment plans may include surgery, radiation, and/or chemotherapy. Some may involve hormone therapy, immunotherapy or other types of biological therapy, or stem cell transplantation.Can cancer be prevented?

It’s usually not possible to know exactly why cancer develops in some people but not others. There are some things that you can’t control which may increase or decrease your risk of getting cancer, such as inheriting certain genes or your age. But some lifestyle habits may increase your risk of certain types of cancer. Avoid or reduce lifestyle habits such as:

• Smoking and tobacco use
• Having too much sun exposure
• Drinking too much alcohol
• Not getting enough physical activity
• Having obesity

NIH: National Cancer Institute

Cancer Immunotherapy

What is immunotherapy?

Immunotherapy is a cancer treatment that helps your immune system fight cancer. It is a type of biological therapy. Biological therapy uses substances made from living organisms or versions of these substances made in a lab. Immunotherapy isn’t used for all cancers, and the response to treatment varies. If you’re getting immunotherapy, your health care provider will monitor your treatment closely.When is immunotherapy used for cancer treatment?

Immunotherapy isn’t used as often as other cancer treatments, such as surgery, chemotherapy, and radiation therapy. But immunotherapy is used for some types of cancer, and researchers are doing clinical trials to see whether it also works for other types.How does immunotherapy work against cancer?

Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes, this process goes wrong. When you have cancer, some of your cells begin to multiply without stopping, and old cells don’t die when they should. They spread into the surrounding tissues.

One reason cancer cells can keep growing and spreading is that they can hide from your immune system. Some immunotherapies can “mark” your cancer cells. This makes it easier for your immune system to find and destroy the cells. It is a type of targeted therapy that uses medicines or other substances that attack specific cancer cells with less harm to normal cells. Other types of immunotherapies work by boosting your immune system to work better against cancer.How is immunotherapy given?

There are different forms of immunotherapy, so how they are given varies. You could get immunotherapy intravenously (by IV), in pills or capsules, or cream for your skin. For bladder cancer, they might place it directly into your bladder.

How often and how long you get immunotherapy also varies. It depends on your type of cancer, how advanced it is, the type of immunotherapy you get, and how well it is working. You may have treatment every day, week, or month. Some immunotherapies are given in cycles, so your body has time to rest and recover.What are the side effects of immunotherapy?

You may have side effects. The most common side effects are skin reactions at the needle site if you get it by IV. Other side effects may include flu-like symptoms or, rarely, severe reactions.

NIH: National Cancer Institute