Neoplasia
Reading File
Neoplasia is abnormal, uncontrolled cell proliferation that persists even after the initiating stimulus is removed. A neoplasm may be benign or malignant. Malignant neoplasms are cancers that can invade nearby tissue and metastasize.
Topic map
- Definitions and nomenclature: neoplasm, tumour, cancer, benign vs malignant
- Characteristics of benign and malignant tumours
- Carcinogenesis: genetic mutations, oncogenes, tumour-suppressor genes, DNA-repair genes
- Hallmarks of cancer
- Tumour progression and heterogeneity
- Invasion and metastasis
- Cancer epidemiology and environmental causes
- Chemical, radiation, and viral carcinogenesis
- Tumour-host interactions: immunity, paraneoplastic syndromes, cancer cachexia
- Grading, staging, diagnosis, and tumour markers
At a high level, cancer develops through accumulated genetic and epigenetic alterations that give cells advantages in proliferation, survival, angiogenesis, invasion, and immune escape. Benign tumours generally remain localized and are often well differentiated; malignant tumours can invade and spread to distant organs.
Which topic should I explain in detail?
Detailed information on neoplasia
Reading File
Neoplasia is a large pathology unit. A detailed study typically covers:
- Basic concepts: neoplasia, tumour, cancer, dysplasia, carcinoma in situ
- Tumour nomenclature: names of benign and malignant epithelial, mesenchymal, hematologic, and mixed tumours
- Benign vs malignant tumours: differentiation, rate of growth, local invasion, and metastasis
- Cancer genetics: proto-oncogenes, oncogenes, tumour-suppressor genes, apoptosis-regulating genes, and DNA-repair genes
- Hallmarks of cancer: sustained proliferation, resistance to cell death, angiogenesis, invasion, metastasis, immune evasion, and altered metabolism
- Carcinogenesis: chemical, radiation, and microbial causes of cancer
- Tumour progression: clonal evolution, genomic instability, tumour heterogeneity
- Invasion and metastasis: extracellular-matrix degradation, vascular spread, lymphatic spread, and organ tropism
- Tumour immunity and systemic effects: immune surveillance, paraneoplastic syndromes, cachexia
- Diagnosis and prognosis: biopsy, cytology, immunohistochemistry, molecular testing, grading, staging, and tumour markers
High-level overview
A neoplasm is an abnormal mass of tissue whose growth exceeds and is uncoordinated with that of normal tissues, continuing even after the original trigger has stopped. The term tumour is often used interchangeably.
A tumour may be benign or malignant. Benign tumours are usually localized, slow-growing, well differentiated, and non-metastatic. Malignant tumours, or cancers, may show poor differentiation (anaplasia), rapid growth, local tissue invasion, and metastasis. Invasion and metastasis are the most dependable features that distinguish malignancy.
Cancer arises through progressive accumulation of genetic and epigenetic alterations. These changes activate growth-promoting oncogenes, inactivate tumour-suppressor pathways such as TP53 and RB, disrupt DNA repair, evade apoptosis, and allow the tumour to acquire further mutations. Tumours then evolve heterogeneous subclones, which helps explain treatment resistance and recurrence.
Choose one section for a detailed, exam-oriented explanation:
- A. Benign versus malignant tumours and nomenclature
- B. Molecular basis and hallmarks of cancer
- C. Carcinogenesis: chemicals, radiation, and oncogenic microbes
- D. Invasion and metastasis
- E. Diagnosis, grading, staging, and tumour markers
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