Glossary
Cancer terms, defined
Definitions for the words that turn up in a pathology report, a trial consent form or a hospital estimate. Every entry cites its sources and says when it was last checked.
105 termsA
4 termsALK rearrangement
Also: ALK gene rearrangement · ALK fusion
ALK rearrangement is a cancer-driving gene fusion, found in about 2% to 7% of non-small cell lung cancers, that can guide targeted therapy.
Anthracyclines
Also: anthracycline chemotherapy · anthracycline drugs
Anthracyclines are chemotherapy drugs, first identified in the 1950s, used for many cancers but limited by dose-related heart toxicity.
Antibody-drug conjugates
Also: antibody drug conjugates · ADC therapy
Antibody-drug conjugates are targeted cancer medicines that join an antibody to a potent anticancer drug in 3 parts.
Ayushman Bharat PM-JAY
Also: AB PM-JAY · PM-JAY
Ayushman Bharat PM-JAY is India's government health insurance scheme, launched in 2018, that covers eligible families for hospital care.
B
6 termsBiosimilars
Also: biosimilar medicines · biosimilar drugs
Biosimilars are biologic medicines shown to be highly similar to an approved reference biologic, with no clinically meaningful differences.
Bone scan
Also: bone scintigraphy · radionuclide bone scan
A bone scan is a nuclear medicine test that uses a small amount of radioactive tracer to show areas of increased bone activity.
Brachytherapy
Also: brachy therapy · sealed-source radiotherapy
Brachytherapy is internal radiation therapy that places a radioactive source inside or next to a tumour, often for minutes or permanently.
BRCA1 and BRCA2 testing
Also: BRCA testing · BRCA1/2 testing
BRCA1 and BRCA2 testing is a blood or saliva genetic test that looks for inherited harmful variants linked to higher cancer risk.
Breast cancer
Also: breast carcinoma
Breast cancer is a cancer that starts in breast tissue; about 2.4 million women were diagnosed worldwide in 2024.
Breast-conserving surgery
Also: breast conserving surgery · lumpectomy
Breast-conserving surgery is an operation that removes the breast cancer plus a small rim of normal tissue while keeping most of the breast.
C
15 termsCancer stage
Also: cancer stage grouping · cancer staging
Cancer stage is a description of how far a cancer has spread, often grouped from stage 0 to stage IV.
Cancer survivorship
Also: survivorship care · cancer survivorship care
Cancer survivorship is comprehensive care after a cancer diagnosis, beginning at diagnosis and continuing for life.
CAR-T cell therapy
Also: CAR-T · CAR T-cell therapy
CAR-T cell therapy is a personalised immunotherapy that engineers a patient's T cells to target cancer, mainly certain blood cancers.
Cashless treatment
Also: cashless hospitalisation · cashless hospitalisation
Cashless treatment is hospital care in which the insurer or government scheme pays the empanelled hospital directly for covered services.
Cervical cancer
Also: cancer of the cervix · cervix cancer
Cervical cancer is cancer that starts in the cervix, and about 95% of cases are linked to persistent high-risk HPV infection.
Chemotherapy
Also: chemo · cytotoxic chemotherapy
Chemotherapy is cancer treatment with medicines that kill or slow fast-growing cells, often given in cycles.
Chemotherapy-induced hair loss
Also: chemotherapy-induced alopecia · chemo hair loss
Chemotherapy-induced hair loss is hair thinning or loss caused by chemotherapy, affecting about 65% of patients.
Chemotherapy-induced nausea and vomiting
Also: CINV · chemo nausea
Chemotherapy-induced nausea and vomiting (CINV) is nausea or vomiting caused by cancer chemotherapy, with acute symptoms often starting within 24 hours.
Clinical trial phases I to IV
Also: clinical trial phases · phases of clinical trials
Clinical trial phases I to IV are the four main stages used to test a medical treatment, from early safety studies to post-approval monitoring.
Clinical Trials Registry - India (CTRI)
Also: CTRI · Clinical Trials Registry India
Clinical Trials Registry - India (CTRI), launched in 2007, is India's free public registry for clinical studies conducted in the country.
Colorectal cancer
Also: bowel cancer · colorectal carcinoma
Colorectal cancer is cancer of the colon or rectum and accounts for about 10% of all cancer cases worldwide.
Colposcopy
Also: colposcopic examination
Colposcopy is a magnified examination of the cervix, vagina, or vulva, often with biopsy, usually done after an abnormal screening test.
Compassionate use
Also: compassionate access · compassionate use programme
Compassionate use is access to an unapproved medicine outside a clinical trial for a patient with a serious disease when no satisfactory options exist.
Control arm
Also: control group · trial control arm
A control arm is the comparison group in a clinical trial, often receiving standard treatment, placebo, or no investigational therapy.
Core needle biopsy
Also: core biopsy · Tru-Cut biopsy
Core needle biopsy is a procedure that uses a hollow needle to remove a small cylinder of tissue for lab testing.
D
2 termsDay care treatment
Also: daycare treatment · day-care treatment
Day care treatment is planned medical or surgical care with admission and discharge on the same day, often within 12 hours.
Disease-free survival
Also: disease free survival · DFS endpoint
Disease-free survival (DFS) is the time from randomisation or curative treatment to cancer recurrence or death from any cause.
E
5 termsECOG performance status
Also: ECOG score · ECOG status
ECOG performance status is a 0 to 5 scale that rates how a cancer patient's daily functioning is affected by illness.
EGFR mutation
Also: EGFR mutation testing · epidermal growth factor receptor mutation
EGFR mutation is a change in the EGFR gene, most often tested in non-small cell lung cancer to guide targeted treatment.
Endoscopy
Also: endoscopic examination
Endoscopy is a procedure that uses a flexible tube with a camera to look inside the body and often take biopsies or treat problems.
ER status
Also: oestrogen receptor status · estrogen receptor status
ER status is a breast cancer biomarker test that reports whether at least 1% of tumour cells stain for estrogen receptor.
Ethics committee
Also: institutional ethics committee · independent ethics committee
An ethics committee is an independent body that reviews human research before it starts and monitors it to protect participants.
F
4 termsFebrile neutropenia
Also: neutropenic fever
Febrile neutropenia is fever with a very low neutrophil count, often ANC below 500 cells/mm3, and is a medical emergency.
Fine needle aspiration cytology (FNAC)
Also: FNAC · fine-needle aspiration cytology
Fine needle aspiration cytology (FNAC) is a minimally invasive test that uses a 22 to 25 gauge needle to remove cells for microscopic examination.
Fluorescence in situ hybridisation (FISH)
Also: FISH test · FISH testing
Fluorescence in situ hybridisation (FISH) is a lab test that uses fluorescent DNA probes to detect specific chromosome or gene changes in cells.
Foreigners Regional Registration Office (FRRO)
Also: FRRO · Foreigners Regional Registration Office
The Foreigners Regional Registration Office (FRRO) is the Indian government office that handles visa and stay registration for foreign nationals, including e-FRRO online services.
G
2 termsGallbladder cancer
Also: gall bladder cancer · gallbladder carcinoma
Gallbladder cancer is a rare cancer of the gallbladder, and adenocarcinoma accounts for most cases.
Generic medicines
Also: generic drugs · generic medications
Generic medicines are drugs approved as equivalent to a brand-name medicine, with the same active ingredient, strength, and dosage form.
H
4 termsHazard ratio
Also: survival hazard ratio
Hazard ratio is a time-to-event measure where 1.0 means equal event rates between two groups over follow-up.
HER2 status
Also: HER2 testing · HER-2 status
HER2 status is a tumour biomarker result, usually from IHC and sometimes ISH, that shows whether a cancer has excess HER2 protein or HER2 gene amplification.
Homologous recombination deficiency (HRD)
Also: homologous recombination deficiency · HRD status
Homologous recombination deficiency (HRD) is a tumour biomarker showing impaired repair of double-strand DNA breaks by homologous recombination.
Hormone therapy
Also: endocrine therapy · hormonal cancer therapy
Hormone therapy is a cancer treatment that slows or stops hormone-sensitive cancers by blocking hormones or their receptors.
I
6 termsImmune checkpoint inhibitors
Also: checkpoint inhibitors · immune checkpoint blockade
Immune checkpoint inhibitors are cancer drugs that block PD-1, PD-L1, or CTLA-4 to help T cells attack tumours.
Immune-related adverse events
Also: irAEs · immune-related side effects
Immune-related adverse events are side effects from checkpoint immunotherapy that can affect almost any organ, including skin, gut, lungs, and glands.
Immunohistochemistry (IHC)
Also: immunohistochemistry · IHC
Immunohistochemistry (IHC) is a lab test that uses antibodies to detect specific proteins in tissue sections, often on biopsy samples.
Immunotherapy
Also: cancer immunotherapy · immuno therapy
Immunotherapy is a cancer treatment that uses the immune system to find and attack cancer cells; modern cancer immunotherapy began in 1891.
Informed consent
Also: informed consent process
Informed consent is a process in which a person voluntarily agrees to care or research after receiving and understanding key information.
Intensity-modulated radiotherapy (IMRT)
Also: IMRT · intensity-modulated radiotherapy
Intensity-modulated radiotherapy (IMRT) is an advanced form of external-beam radiation therapy introduced in the 1990s that varies beam intensity to better spare normal tissue.
K
2 termsKi-67 index
Also: Ki67 index · Ki-67 proliferation index
Ki-67 index is the percentage of tumour cells staining positive for Ki-67, a proliferation marker, usually reported as a percent.
KRAS G12C mutation
Also: KRAS G12C · KRAS p.G12C
KRAS G12C mutation is a specific KRAS gene change in which glycine at codon 12 is replaced by cysteine; it occurs in about 12% of NSCLC.
L
6 termsLeukaemia
Also: leukaemia · leukamia
Leukaemia is a cancer of the blood-forming tissues in which abnormal white blood cells grow out of control.
Liquid biopsy
Also: liquid biopsy testing
Liquid biopsy is a test, usually from blood, that looks for tumour material outside the tumour itself.
Locally advanced cancer
Also: locally advanced disease · locally advanced tumour
Locally advanced cancer is cancer that has spread beyond its starting site into nearby tissues or lymph nodes but not to distant organs.
Lung cancer
Also: lung carcinoma
Lung cancer is cancer that starts in the lungs, and it is the leading cause of cancer death worldwide.
Lymphoedema
Also: lymphedema · lymph oedema
Lymphoedema is chronic swelling caused by impaired lymph drainage, often after cancer treatment involving lymph nodes.
Lymphoma
Also: lymphatic cancer
Lymphoma is a cancer of lymphocytes in the lymphatic system, broadly divided into 2 main groups: Hodgkin and non-Hodgkin lymphoma.
M
10 termsMastectomy
Also: breast removal surgery
Mastectomy is surgery to remove a whole breast, and it may involve 1 or both breasts depending on the reason for surgery.
Medical visa
Also: Indian medical visa · India medical visa
A medical visa is a travel permit for treatment abroad; in India, the e-Medical visa is meant for foreign patients seeking care.
MET exon 14 skipping
Also: MET exon 14 skipping mutation · METex14
MET exon 14 skipping is an actionable MET gene alteration found in about 3% to 4% of non-small-cell lung cancers.
Metastatic cancer
Also: metastatic disease · metastases
Metastatic cancer is cancer that has spread from its original site to distant parts of the body, which is stage IV for many solid tumours.
Microsatellite instability-high (MSI-H)
Also: MSI-H · MSI-high
Microsatellite instability-high (MSI-H) is a tumour biomarker showing defective DNA mismatch repair; about 15% of colorectal cancers are MSI-H.
Mismatch repair deficiency (dMMR)
Also: dMMR · deficient mismatch repair
Mismatch repair deficiency (dMMR) is a tumour biomarker showing loss of DNA repair function, seen in about 15% of colorectal cancers.
Monoclonal antibodies
Also: monoclonal antibody therapy
Monoclonal antibodies are lab-made proteins that bind one specific target, and many cancer treatments use them by IV infusion.
MRI scan
Also: MRI · magnetic resonance imaging
MRI scan is a noninvasive imaging test that uses a strong magnetic field and radio waves to create detailed body images.
Multidisciplinary team
Also: multidisciplinary cancer team · multidisciplinary care team
A multidisciplinary team is a group of cancer specialists who review a patient's case together to plan care, a model widely adopted since the 1990s.
Multiple myeloma
Also: myeloma · plasma cell myeloma
Multiple myeloma is a plasma cell cancer that makes abnormal monoclonal protein and accounts for about 10% of blood cancers.
N
2 termsNeutropenia
Also: low neutrophil count
Neutropenia is a low neutrophil count, usually defined as an absolute neutrophil count below 1,500 cells/µL.
Next-generation sequencing (NGS)
Also: NGS · next-generation sequencing
Next-generation sequencing (NGS) is a DNA or RNA testing method that reads millions of fragments in parallel to detect genetic changes.
O
4 termsObjective response rate
Also: ORR · overall response rate
Objective response rate (ORR) is the percentage of trial patients whose measurable cancer shrinks enough to meet preset criteria, usually complete or partial response.
Oral cancer
Also: mouth cancer · oral cavity cancer
Oral cancer is cancer that starts in the mouth, and most cases are squamous cell carcinoma.
Oral mucositis
Also: oral mucosal inflammation · chemotherapy mouth sores
Oral mucositis is painful inflammation and ulceration of the mouth lining during cancer treatment, affecting about 40% of chemotherapy patients.
Overall survival
Also: overall survival rate · overall survival endpoint
Overall survival is the time from randomisation in a cancer trial until death from any cause.
P
15 termsPalliative care
Also: palliative medicine
Palliative care is specialised care that improves quality of life for people with serious illness; globally, only about 14% who need it receive it.
PARP inhibitors
Also: PARP inhibitor therapy · poly ADP-ribose polymerase inhibitors
PARP inhibitors are targeted cancer drugs that block DNA repair; olaparib was first FDA-approved in 2014.
Patient assistance programme
Also: patient assistance programme · medicine assistance programme
A patient assistance programme is a scheme that helps eligible patients get prescribed medicines at low or no cost; evidence reviews note access can improve but data are limited.
PD-L1 combined positive score (CPS)
Also: PD-L1 CPS · combined positive score
PD-L1 combined positive score (CPS) is an immunohistochemistry score from 0 to 100 that estimates PD-L1 expression in tumour and immune cells.
PD-L1 expression
Also: PD-L1 testing · PDL1 expression
PD-L1 expression is the amount of programmed death-ligand 1 seen on tumour or immune cells, often reported as a percentage on pathology testing.
PD-L1 tumour proportion score (TPS)
Also: PD-L1 TPS · tumour proportion score
PD-L1 tumour proportion score (TPS) is the percentage of viable tumour cells showing PD-L1 staining, often grouped as <1%, 1-49%, or ≥50%.
Performance status
Also: functional performance status
Performance status is a clinical rating of how well a person functions in daily life, often scored from 0 to 5.
Peripheral neuropathy
Also: peripheral nerve damage
Peripheral neuropathy is damage to nerves outside the brain and spinal cord, often causing numbness, tingling, burning pain, or weakness.
PET-CT scan
Also: PET-CT · PET/CT
A PET-CT scan is a combined imaging test that joins PET and CT in one session to show both body function and anatomy.
Placebo
Also: placebo treatment
Placebo is an inactive treatment used in research and care; in trials, it helps show whether a therapy works beyond expectation effects.
Platinum agents
Also: platinum chemotherapy · platinum-based chemotherapy
Platinum agents are cancer chemotherapy drugs, including cisplatin, carboplatin, and oxaliplatin, that damage tumour DNA.
PR status
Also: progesterone receptor status · PR testing
PR status is the progesterone receptor test result in breast cancer, usually reported as positive or negative on tumour cells.
Progression-free survival
Also: PFS · progression free survival
Progression-free survival (PFS) is the time from random assignment in a trial until cancer grows, spreads, or death occurs.
Prostate cancer
Also: prostate carcinoma · prostrate cancer
Prostate cancer is a cancer of the prostate gland, and about 95% of cases are adenocarcinomas.
Proton therapy
Also: proton beam therapy · proton radiotherapy
Proton therapy is a type of radiation treatment that uses proton beams to deliver most of the dose at a chosen depth in tissue.
R
5 termsRadiotherapy
Also: radiation therapy · radiation treatment
Radiotherapy is a cancer treatment that uses high-energy radiation; more than half of people with cancer receive it at some point.
Randomisation
Also: randomisation · random allocation
Randomisation is assigning trial participants to study groups by chance to reduce bias; in a 1:1 trial, each person has an equal allocation ratio.
Re-biopsy
Also: rebiopsy · repeat biopsy
Re-biopsy is a second biopsy done after an earlier biopsy, often to get enough tissue or reassess disease after treatment.
Resectable cancer
Also: resectable tumour · resectable tumour
Resectable cancer is cancer that can be completely removed by surgery with clear margins and acceptable risk.
ROS1 rearrangement
Also: ROS1 gene rearrangement · ROS1 fusion
ROS1 rearrangement is a gene fusion biomarker found in about 1% to 2% of non-small cell lung cancers.
S
5 termsSecond opinion
Also: second medical opinion · oncology second opinion
A second opinion is an independent review of a diagnosis or treatment plan by another doctor in the same specialty.
Stem cell transplant
Also: haematopoietic stem cell transplant · haematopoietic stem cell transplant
Stem cell transplant is a treatment that replaces blood-forming stem cells, often after high-dose therapy, to restore bone marrow function.
Stomach cancer
Also: gastric cancer · gastric carcinoma
Stomach cancer, also called gastric cancer, is a cancer that starts in the stomach lining and is usually an adenocarcinoma.
Supportive care
Also: supportive cancer care · supportive oncology care
Supportive care is cancer care that prevents and treats symptoms and treatment side effects from diagnosis onward.
Surgical biopsy
Also: open surgical biopsy
Surgical biopsy is a procedure in which a surgeon makes an incision to remove part or all of an abnormal area for laboratory diagnosis.
T
7 termsTargeted therapy
Also: molecularly targeted therapy · targeted cancer therapy
Targeted therapy is cancer treatment that acts on specific molecular targets, with imatinib's 2001 approval marking a major milestone.
Taxanes
Also: taxane chemotherapy · taxane drugs
Taxanes are chemotherapy drugs that block cell division by stabilising microtubules; the main agents are paclitaxel, docetaxel, and cabazitaxel.
TNM staging
Also: TNM classification · tumour node metastasis staging
TNM staging is a cancer classification system that describes tumour size, lymph node spread, and metastasis using 3 core components.
Tumour board
Also: tumour board · multidisciplinary tumour board
A tumour board is a multidisciplinary cancer meeting where specialists review a case together to recommend treatment.
Tumour grade
Also: tumour grade · histological grade
Tumour grade is a pathology measure, usually on a 1-to-3 scale, of how abnormal cancer cells look and how aggressively they may behave.
Tumour markers
Also: tumour markers · tumour marker tests
Tumour markers are measurable substances in blood, urine, or tissue that can help detect, monitor, or guide treatment for some cancers.
Tyrosine kinase inhibitors (TKIs)
Also: tyrosine kinase inhibitors · TKIs
Tyrosine kinase inhibitors (TKIs) are targeted cancer drugs that block abnormal kinase signals; more than 40 have been approved in humans.