Although "cancer" is a name of a certain medical condition, it is not a certain disease. The name "cancer" represents the illness of many different types of tissues and organs. Therefore diagnosis and prognosis of cancer illness need a multidicipliner aproach. Every medical diciplin examines it's own part. We are offering a better understanding by using detailed examples about oncologic medical malpractices for a deeper and holistic aproach about types of faults of medical professionals dealing with "the cancer".