Adaptive

Learn Oncology

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Session Length

~17 min

Adaptive Checks

15 questions

Transfer Probes

Lesson Notes Key Concepts Concept Map Worked Example Start Adaptive Practice

Lesson Notes

Oncology is the branch of medicine devoted to the study, diagnosis, treatment, and prevention of cancer. Cancer arises when normal cells undergo genetic mutations that disrupt the regulatory mechanisms governing cell growth and division, leading to uncontrolled proliferation and the potential to invade surrounding tissues or spread to distant organs through a process called metastasis. Oncology encompasses a vast spectrum of malignancies, from common solid tumors such as breast, lung, and colorectal cancers to hematologic malignancies including leukemias, lymphomas, and myelomas.

The discipline is traditionally divided into three major clinical specialties: medical oncology, which focuses on systemic therapies such as chemotherapy, targeted therapy, immunotherapy, and hormonal therapy; surgical oncology, which involves the operative removal of tumors and surrounding tissue; and radiation oncology, which uses ionizing radiation to destroy cancer cells or shrink tumors. Modern oncology increasingly relies on a multidisciplinary team approach, integrating pathology, radiology, genetics, palliative care, and psychosocial support to deliver comprehensive patient-centered care.

The field has undergone revolutionary advances in the twenty-first century. The completion of the Human Genome Project and the advent of next-generation sequencing have enabled precision oncology, where treatment is tailored to the molecular profile of an individual's tumor rather than solely its anatomical site. Immunotherapy, particularly immune checkpoint inhibitors targeting PD-1, PD-L1, and CTLA-4, has transformed outcomes for previously intractable cancers such as melanoma and non-small cell lung cancer. CAR-T cell therapy, liquid biopsies, and artificial intelligence-driven diagnostics represent the frontier of a field that continues to redefine what is possible in the fight against cancer.

You'll be able to:

Analyze the molecular mechanisms of carcinogenesis including oncogene activation, tumor suppressor loss, and genomic instability
Evaluate staging systems and prognostic biomarkers used to guide treatment selection for solid and hematologic malignancies
Apply principles of chemotherapy, radiation therapy, and immunotherapy to explain their mechanisms and clinical indications
Compare targeted therapy approaches including monoclonal antibodies, kinase inhibitors, and CAR-T cell therapy for cancer treatment

One step at a time.

Key Concepts

Carcinogenesis

The multistep biological process by which normal cells are transformed into cancer cells through the accumulation of genetic and epigenetic alterations. It typically involves initiation (DNA damage), promotion (clonal expansion), and progression (invasion and metastasis).

Example: Chronic exposure to tobacco smoke causes sequential mutations in lung epithelial cells, first producing dysplasia, then carcinoma in situ, and ultimately invasive lung cancer over a period of years to decades.

Metastasis

The process by which cancer cells spread from the primary tumor to distant organs through the bloodstream or lymphatic system. Metastasis is responsible for approximately 90% of cancer-related deaths and involves a complex cascade of invasion, intravasation, survival in circulation, extravasation, and colonization.

Example: Breast cancer commonly metastasizes to bone, liver, lung, and brain. A patient initially treated for breast cancer may present years later with back pain caused by metastatic lesions in the spine.

Tumor Staging (TNM System)

A standardized classification system that describes the extent of cancer based on Tumor size and local extent (T), regional lymph Node involvement (N), and distant Metastasis (M). Staging guides treatment decisions and provides prognostic information.

Example: A colon cancer classified as T3N1M0 indicates the tumor has grown through the muscle layer of the colon wall (T3), spread to one to three regional lymph nodes (N1), but has no distant metastasis (M0), corresponding to Stage III disease.

Immune Checkpoint Inhibitors

A class of immunotherapy drugs that block inhibitory proteins (checkpoints) on immune cells or cancer cells, thereby unleashing the immune system to recognize and attack tumors. Key targets include PD-1, PD-L1, and CTLA-4.

Example: Pembrolizumab (Keytruda), a PD-1 inhibitor, dramatically improved survival in advanced melanoma and is now approved for multiple cancer types including lung, head and neck, and bladder cancers.

Precision Oncology

An approach to cancer treatment that uses genomic profiling and molecular analysis of a patient's tumor to identify specific driver mutations and select targeted therapies most likely to be effective for that individual's cancer.

Example: A patient with non-small cell lung cancer whose tumor harbors an EGFR exon 19 deletion receives osimertinib, a targeted EGFR inhibitor, rather than conventional chemotherapy, resulting in better response rates and fewer side effects.

Tumor Microenvironment

The complex ecosystem surrounding a tumor, consisting of blood vessels, immune cells, fibroblasts, signaling molecules, and extracellular matrix. The microenvironment plays a critical role in tumor growth, immune evasion, and response to therapy.

Example: Tumors described as 'immune hot' have high infiltration of cytotoxic T cells and tend to respond well to checkpoint inhibitors, while 'immune cold' tumors with few immune cells often resist immunotherapy.

Oncogenes and Tumor Suppressor Genes

Oncogenes are mutated forms of normal genes (proto-oncogenes) that promote uncontrolled cell growth when activated. Tumor suppressor genes normally restrain cell division, and their loss of function through mutation contributes to cancer development.

Example: The TP53 gene is the most commonly mutated tumor suppressor in human cancers, found altered in over 50% of all malignancies. The HER2 oncogene is amplified in about 20% of breast cancers and is targeted by trastuzumab (Herceptin).

Chemotherapy

The use of cytotoxic drugs to kill rapidly dividing cancer cells or inhibit their growth. Chemotherapy agents work through various mechanisms including DNA damage, inhibition of DNA synthesis, and disruption of mitotic spindle formation. They often affect normal rapidly dividing cells as well, leading to side effects.

Example: The FOLFOX regimen (folinic acid, fluorouracil, and oxaliplatin) is a standard adjuvant chemotherapy protocol for stage III colon cancer, reducing the risk of recurrence by approximately 20% compared to surgery alone.

More terms are available in the glossary.

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