Cancer is often called as a lifestyle disease, which afflicts people all around the world. To make things worse, it is further strengthened by the unsupportive genetic makeup of the patient. It is difficult to pinpoint a certain cause, as cancer is the consequence of interplay between environmental cues and genetic profile. Despite the tremendous worldwide advances in healthcare and research, a rise in the incidence of cancer is being witnessed, referred to as the cancer boom. Keeping that in view, this book has been written with a keen attempt to target students appearing for graduate and postgraduate entrance exams, CSIR-UGC NET, GATE, etc. The book uses a very simple, crisp, and easy-to-comprehend language. It has many facts and MCQs that serve as a ready reckoner for the students. The author has briefly touched all aspects of cancers viz, molecular, immunological, genetic and epigenetic. The key features of the book include classification and aetiology of cancer; role of oncogenes, tumour suppressor, DNA repair and apoptotic genes; carcinogenesis; antineoplastic agents; and immune-evasive mechanisms and immunotherapy. The book also describes twenty different examples of widely known cancers, enlisting their subtypes, risk factors, symptoms, diagnosis, treatment, and prognosis.