Top 10 Best Oncologists in Mumbai. Dr. Nilesh Lokeshwar. Dr. Nilesh Lokeshwar is among the top Medical Oncologists in Mumbai. He has 22 years of experience in the field. She completed. Dr. Avinash Deo. Dr. Tapan Saikia. Dr. Suresh H Advani. Dr. Boman Nariman Dhabhar.