This book is about oral cancer (oral squamous cell carcinoma). This disease is one of the top five killers in Pakistan. It is also a major killer in the neighbouring countries. The incidence rate of oral cavity cancer in Karachi is estimated to be among the highest in the world. Well known risk factors for oral cancer are smoking and alcohol while alternative chewing habits are implicated in sub continent. As many individuals are exposed to these risk factors, only a small proportion develops oral cancer. This suggests that other factors may also play a role in oral carcinogenesis. Recently,...