Medical Oncology Glossary
100 terms total — 24 showing — Last updated 15 Sep 2026
Ki-67 index
A measure of cellular proliferation expressed as the percentage of Ki-67 positive tumor cells, used in cancer prognosis and treatment decisions.
ablative therapy
Cancer treatment designed to completely destroy or remove target tissue, typically through high-dose radiation or surgic...
adenocarcinoma
A type of cancer that forms in mucus-secreting glands throughout the body.
adjuvant therapy
Additional cancer treatment given after primary treatment to reduce risk of recurrence.
anastomosis
Surgical connection between two structures, particularly bowel segments following tumor resection.
angiogenesis
The formation of new blood vessels that tumors stimulate to support their growth.
biomarker
Measurable biological indicator used to assess disease state or treatment response.
brachytherapy
A form of radiation therapy where radioactive sources are placed directly inside or adjacent to the tumor.
BRAF mutation
A genetic alteration in the BRAF gene commonly found in melanoma and certain other cancers, targetable with specific inh...
BRCA1/BRCA2
Tumor suppressor genes associated with hereditary breast and ovarian cancer syndrome; mutations significantly increase c...
BRMS1
Breast cancer metastasis suppressor 1, a gene that regulates cancer cell invasion and metastatic potential.
cachexia
Severe weight loss and muscle wasting syndrome commonly seen in advanced cancer patients.
CAR-T cell therapy
Chimeric antigen receptor T-cell therapy; a personalized immunotherapy using genetically modified patient T cells to tar...
CEA
Carcinoembryonic antigen, a tumor marker used primarily for monitoring colorectal cancer.
checkpoint inhibitor
Immunotherapy drugs that block immune checkpoint proteins, allowing T cells to attack cancer cells more effectively.
circulating tumor DNA
Cell-free DNA fragments released by tumors into the bloodstream, used for non-invasive monitoring and genomic profiling.
complete response
Disappearance of all detectable cancer following treatment.
consolidation therapy
Intensive treatment given after initial remission to eliminate residual cancer cells.
CR
Complete response - complete disappearance of all detectable cancer.
CTCAE
Standardized system for grading adverse events in cancer clinical trials.
cytokine release syndrome
Systemic inflammatory response caused by immune activation from certain cancer treatments.
cytopenia
Reduction in the number of one or more types of blood cells below normal levels.
cytoreduction
Surgical removal of as much tumor tissue as possible, typically performed for ovarian or peritoneal cancers.
cytotoxic
Describes agents or treatments that are toxic to cells, particularly cancer cells.
debulking surgery
Surgical procedure to remove the bulk of tumor mass when complete resection is not possible.