This document provides an overview of neoplasia and tumor biology, including: 1) It describes the nomenclature used for benign and malignant tumors, and differentiates between tumors of epithelial, connective tissue, and mixed cell origins. 2) It outlines key properties of benign and malignant tumors such as growth rate, differentiation, invasion, metastasis, and effects on the host. 3) It discusses genes involved in carcinogenesis including oncogenes, tumor suppressor genes, and DNA repair genes. It also covers chemical, microbial, and radiation carcinogens.