Cancer Biology
Cancer Biology is the scientific study of Cancer — the branch of biomedical science dedicated to understanding how cancer cells form, grow, survive, spread and respond to treatment. It is one of the most rapidly advancing and critically important fields in modern medicine — combining molecular biology, cell biology, genetics, immunology and physiology to understand one of humanity's most complex and devastating groups of diseases.
What is Cancer?
Cancer is not a single disease — it is a collection of more than 100 different diseases, all characterised by the uncontrolled growth and spread of abnormal cells. In a healthy body, cells grow, divide and die in an orderly, regulated manner. In cancer, this regulation breaks down — cells begin to divide uncontrollably, ignore signals to stop growing and acquire the ability to invade surrounding tissues and spread to other parts of the body through a process called metastasis.
Cancer can arise in virtually any tissue of the body — giving rise to the many different types of cancer including breast cancer, lung cancer, colorectal cancer, prostate cancer, leukaemia, lymphoma, brain cancer and hundreds more.
Key Areas of Cancer Biology
Oncogenes and Tumour Suppressor Genes
At the heart of cancer biology is the study of the genes that control cell growth. Oncogenes are mutated versions of normal genes (proto-oncogenes) that promote uncontrolled cell growth when activated. Tumour suppressor genes normally act as brakes on cell division — and when these are mutated or inactivated, cells lose a critical layer of growth control. The interplay between oncogenes and tumour suppressor genes is fundamental to understanding how cancer begins and progresses.
Hypoxia in Cancer
One of the most important areas in cancer biology is the study of hypoxia — the condition of low oxygen that develops within growing tumours as they outpace their blood supply. Hypoxia fundamentally reprograms cancer cells — making them more aggressive, more resistant to treatment and more likely to spread. Understanding how cancer cells adapt to and exploit hypoxia is a major focus of modern cancer research.
Cancer Metastasis
Metastasis — the spread of cancer from its original site to other parts of the body — is responsible for the vast majority of cancer deaths. Cancer biologists study the molecular and cellular mechanisms that enable cancer cells to detach from their primary tumour, enter the bloodstream or lymphatic system, survive in circulation and establish new tumours at distant sites.
Tumour Microenvironment
Cancer does not grow in isolation — it interacts constantly with the surrounding normal cells, blood vessels, immune cells and extracellular matrix that make up the tumour microenvironment. Understanding these interactions is essential for developing effective cancer therapies — particularly immunotherapies that harness the body's own immune system to fight cancer.
miRNA and Epigenetic Regulation
MicroRNAs (miRNAs) are small non-coding RNA molecules that regulate gene expression at the post-transcriptional level — and play critical roles in cancer biology. Aberrant miRNA expression has been linked to virtually every type of cancer — influencing cell proliferation, apoptosis, angiogenesis and metastasis. Epigenetic changes — heritable alterations in gene expression that do not involve changes to the DNA sequence itself — are also central to cancer development and progression.
Angiogenesis
Growing tumours require a dedicated blood supply — and cancer cells actively stimulate the formation of new blood vessels through a process called angiogenesis. Anti-angiogenic therapies — designed to cut off the tumour's blood supply — are an important class of cancer treatments.
Apoptosis and Cell Death
Apoptosis — programmed cell death — is one of the body's most important defences against cancer. Cancer cells frequently acquire mutations that allow them to evade apoptosis — surviving when normal cells would die. Understanding and restoring apoptotic pathways is a key goal of cancer therapy research.
Cancer Stem Cells
Cancer stem cells are a subpopulation of cancer cells with stem cell-like properties — including the ability to self-renew, differentiate and initiate tumour growth. They are believed to be responsible for tumour recurrence, metastasis and treatment resistance — making them a critical target for next-generation cancer therapies.
Types of Cancer Studied in Cancer Biology
Cancer biologists study a wide range of cancer types including:
- Breast Cancer — Including postpartum breast cancer, triple-negative breast cancer and hormone receptor-positive cancers
- Lung Cancer — Including non-small cell and small cell lung cancers
- Colorectal Cancer
- Prostate Cancer
- Leukaemia and Lymphoma — Cancers of the blood and lymphatic system
- Brain Cancer — Including glioblastoma
- Pancreatic Cancer
- Liver Cancer
- Cervical and Ovarian Cancer
Cancer Research in India
India has a growing and increasingly impactful cancer research community — with major research institutions including the Tata Memorial Centre (Mumbai), All India Institute of Medical Sciences (AIIMS), Banaras Hindu University, Indian Institute of Science (IISc) and numerous other universities and hospitals contributing to cancer biology research. Indian researchers funded through ICMR and UGC fellowships are making significant contributions to global cancer biology — both within India and at leading international institutions.
Cancer Therapy
Cancer biology research is the foundation of cancer therapy development — including:
- Chemotherapy — Drugs that kill rapidly dividing cancer cells
- Radiation Therapy — Using high-energy radiation to damage cancer cell DNA
- Targeted Therapy — Drugs designed to attack specific molecular targets in cancer cells
- Immunotherapy — Harnessing the immune system to recognise and destroy cancer cells
- Hormone Therapy — Blocking hormones that fuel certain cancers
- Gene Therapy — Correcting or replacing faulty genes in cancer cells