Finding Oncologist in Hadapsar, Deccan, Kalyani Nagar, Pune ? Best Oncologist in Hadapsar, Deccan, Kalyani Nagar and Pune ? Dr Rahul Kulkarni is A Reliable and No 1 Oncologist in Hadapsar, Deccan, Kalyani Nagar and Entire Pune, Best Oncologist in Pune. An oncologist is a doctor who treats cancer and provides medical care for a person diagnosed with cancer. The field of oncology has three major areas: medical, surgical, and radiation. A medical oncologist treats cancer using chemotherapy or other medications, such as targeted therapy or immunotherapy.