This document discusses the aetiology of neoplasia (tumor development). It identifies several risk factors for cancer development including age, genetics, environment, and lifestyle habits. It describes how various carcinogenic agents like chemicals, radiation, viruses, and hormones can cause DNA damage and genetic mutations over time, leading to cancer initiation and promotion. Specifically, it explains how ionizing radiation, ultraviolet light, viruses, chemicals, and hormones may contribute to cancer development and progression through their effects on DNA and cell proliferation.

1. Neoplasia Aetiology

2. Aetiology