Navigating cancer care can feel overwhelming, especially when you’re suddenly faced with medical terms you’ve never heard before. Understanding these words can make a big difference in feeling more in control of your care, knowing what questions to ask, and making informed decisions. This glossary is a simple guide to common language used throughout a cancer diagnosis and treatment process.
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Stage
Doctors use cancer staging to determine how advanced the disease is. Staging considers tumor size, location, and whether cancer has spread. This information helps providers form treatment plans and work closely with specialists.
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Biomarker
A measurable substance such as a gene, protein, or hormone that gives doctors insight into the type of cancer, how it may respond to treatment, or whether it’s come back. These are sometimes called tumor markers.
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Hormone Receptor Type
Some cancers, like breast or prostate cancer, react to hormones in different ways. Knowing a tumor’s hormone receptor status, such as HER2+, ER/PR+, or Triple Negative, helps determine which treatments will be most effective.
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Mutation
Cancers such as lung cancer can develop mutations in certain genes, like KRAS or ROS1. Identifying these changes can help guide personalized treatment. Malignant Tumor – This term refers to a tumor made up of cancerous cells. These cells grow out of control, may invade nearby tissue, and can spread to other areas of the body through the blood or lymph system.
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Benign Tumor
A benign tumor is not cancerous. While it is made up of abnormal cells, it doesn’t spread into surrounding tissues or travel to other parts of the body.
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Hematologic Cancer
This describes cancers that affect the blood, bone marrow, or lymphatic system—such as leukemia, lymphoma, or myeloma.
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Neoadjuvant Therapy
A treatment given before the primary cancer treatment. For instance, medication might be used to shrink a tumor before surgery or radiation to increase the effectiveness of the main therapy.
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Chemotherapy
A type of cancer treatment that uses medications to destroy cancer cells or slow their growth. It may be used alone or alongside surgery, radiation, or other therapies, and can be given by mouth, injection, or infusion.
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Chemotherapy Port
A small device placed under the skin that connects to a large vein. It allows for easier access to the bloodstream to deliver treatments like chemotherapy or to draw blood.
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Chemotherapy Infusion
A method of giving chemotherapy drugs directly into the bloodstream through an IV or central line. These infusions may be done at a hospital, cancer center, or outpatient infusion clinic.
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Oral Chemotherapy
Chemotherapy that comes in pill or liquid form and is taken by mouth. This method lets patients receive some cancer treatments from home instead of at a clinic.
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Immunotherapy
A treatment that works by activating or modifying the body’s immune system to detect and fight cancer cells. It may be administered through pills, infusions, or injections depending on the specific drug.
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Adjuvant Therapy
A secondary treatment given after the primary method, usually surgery, with the goal of lowering the risk that cancer will return. This may include chemo, radiation, hormone therapy, or immunotherapy.
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Tumor Debulking
A surgical procedure used to remove as much of a tumor as safely possible. Reducing the tumor’s size may help improve the results of other treatments like radiation or chemotherapy.
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Radiation
A form of energy that may be used to image the body (like in X-rays) or to treat cancer. Radiation therapy uses controlled doses to target and destroy cancer cells while trying to spare surrounding healthy tissue.
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Remission
A period when the cancer is no longer progressing or causing symptoms. Complete remission means no signs of cancer are detectable; partial remission means the cancer has shrunk but hasn’t disappeared completely.
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No Evidence of Disease
This term means that, based on current tests and scans, there are no visible signs of cancer in the body. It doesn’t always mean the cancer is gone permanently, but it’s a positive result.
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Recurrence
The return of cancer after a period when it was undetectable or under control. It may show up in the same area or spread elsewhere. Also referred to as relapse.
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Maintenance Therapy
A long-term treatment approach used after initial therapy has worked, with the goal of preventing cancer from returning. It might involve continued use of medication, antibodies, or targeted therapies.
Understanding cancer terms helps empower patients and their families to communicate more clearly with doctors and care teams. If you’re unsure how these definitions apply to your diagnosis, treatment plan, or personal situation, Pillar Patient Advocates is here to help. Our board-certified patient advocates are experienced in guiding individuals and families through complex health journeys and can provide clarity, support, and education every step of the way.