Cancer refers to a group of diseases wherein unnatural cell division occurs in the body. These cells infiltrate and destroy normal organ tissues and affect the natural functioning of the body. Cancerous cells have the ability to spread throughout the body and affect other organs. It is caused by mutations in the DNA of the cells. Apart from containing instructions on what functions to perform, the DNA also contains information related to the growth and division of cells. Sometimes, faulty instructions can lead to a halt in the normal functioning of the cell and transform it into a cancerous cell. Oncology is the branch of medicine which deals with cancer and its treatment. This book provides comprehensive insights into this field. It is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of oncology. Those in search of information to further their knowledge will be greatly assisted by this book.