You can consult with Dr. Ganesh Nagarajan, the top oncology surgeon in Mumbai, and get the most effective treatment depending on the patient's specific case. Cancer patients need not worry if they are diagnosed early because there are top oncologists in Mumbai who can help them combat the disease. Surgical oncologists treat cancer using surgery, including removing the tumor and nearby tissue. This type of surgeon can also perform certain types of biopsies to help diagnose cancer.