The word carcinogenesis literally means the 'generation' of cancer. This book covers biochemical, cellular and molecular processes which are essential wings of carcinogenesis. The in-depth and intensive knowledge of these processes is required for developing new cures, therapies and diagnostic methods to fight complexities of cancer. This book deals with the pre- propensities of cancer and pre-cancerous lesions. Viral, hormonal, oncogenic and biological stimulants are some of the agents of cancer initiation and progression which have been discussed. The usefulness of tests on animals for new preventive or chemotherapeutic measures and related examples have also been discussed in the book. This book also talks about the herbal therapies adopted to treat cancer. Along with all these subjects, latest developments, recent discoveries and prospective measures have also been discussed.