Dr. Milind Bapat Bladder Cancer Specialist in Pune What is Bladder Cancer? According to Dr. Milind Bapat, Bladder Cancer Specialist in Pune bladder cancer is uncommon in individuals younger than 40 years of age, most common in males and more prevalent in smokers. It is caused when the cells inside the urinary bladder develop wildly. Most bladder cancers start from the urothelium-the epithelium of the urinary bladder. It generally takes time to develop but if diagnosed early it is treatable with good results.