Doctors info

Professional Overview

Dr. Karthik S. Rishi is a Senior Consultant in the Department of Radiotherapy at Sri Shankara Cancer Hospital and Research Centre, with over 12 years of experience in clinical radiation oncology. He holds MBBS, MD, and DNB degrees in Radiotherapy, along with a Postgraduate Diploma in Medical Law and Ethics. His areas of expertise include stereotactic radiotherapy (SRS/SRT/SBRT), brachytherapy, hypofractionated radiotherapy, and the treatment of head and neck, gynaecologic, gastrointestinal, brain, and paediatric cancers.

He has trained at MD Anderson Cancer Center (USA) and Stony Brook Medicine, New York, and is an active member of ASTRO, ESTRO, ASCO, ABS, and other international and national oncology societies. He leads various academic, ethical, and clinical quality committees at Shankara and is involved in postgraduate teaching. His clinical research focuses on radiation-induced resistance and precision oncology, and he continues to integrate technology and evidence-based approaches to improve patient outcomes.

Research Publications

1. Self-Reported Oral Pain and Dysfunctions Associated with Radiation Induced Oral Mucositis among Head and Neck Cancer Patients-A Prospective Observational Study

Authors: Thomas PL, Kaur H, Rishi KS

Journal: Indian Journal of Public Health Research & Development

Published: 2019

Additional Details: 10(2):255

2. Glioma arising in the setting of mismatch repair deficiency—rare or are we missing it? Childs Nervous System

Authors: Goyal A, Rao S, Rishi KS, Ramaswamy V, Nishanth Sadashiva, Vani Santosh

Journal: 2023 Sep 21;40(1):233–7

3. Single Institution Experience of Postoperative Electron Beam Radiation Therapy in the Treatment of Keloids

Authors: Rishi KS, Sarkar N, Kesari PK, Muddappa Pathikonda, Ramachandra P, Kumar P, et al

Journal: Advances in Radiation Oncology

Published: 2021 Mar 1

Additional Details: 6(2):100596

4. Preliminary clinical outcomes of patients treated with vaginal brachytherapy alone using multi-channel vaginal brachytherapy applicator in operated early-stage endometrial cancer

Authors: Rishi KS, David S, Muddappa Pathikonda, Ramachandra P, Giri GV, Annapurna Vadaparty, et al

Journal: Reports of Practical Oncology & Radiotherapy

Published: 2021 Feb 25

Additional Details: 26(1):43–9

5. Self-Reported Oral Pain and Dysfunctions Associated with Radiation Induced Oral Mucositis among Head and Neck Cancer Patients-A Prospective Observational Study

Authors: Thomas PL, Kaur H, Rishi KS

Journal: Indian Journal of Public Health Research & Development

Published: 2019

Additional Details: 10(2):255

6. Preliminary clinical outcomes of patients treated with vaginal brachytherapy alone using multi-channel vaginal brachytherapy applicator in operated early-stage endometrial cancer

Authors: Rishi KS, David S, Pathikonda M, Ramachandra P, Giri GV, Vadaparty A, Srinath BS

Journal: Rep Pract Oncol Radiother

Published: 2021 Feb 25

Additional Details: 26(1):43-49

7. A review of interaction of radiotherapy and implants in head and neck cancer—implications and strategies to improve outcomes

Authors: Rishi KS, Subramaniam N, Shetty T, Kaphatia R

Journal: Reports of Practical Oncology and Radiotherapy

Published: 2025

Additional Details: 30(5):706-19

8. Clinical outcomes of external radiotherapy boost versus no boost to radiologically positive lymph nodes in FIGO stage IIIC cervical cancer

Authors: RISHI K, Harshita K, Spandana P, DONAPATI P, PS H, Giri GV

Journal: International Journal of Gynecological Cancer

Published: 2025 Jul 30

Additional Details: 102030

9. Correspondence on" Clinical outcomes of external radiotherapy boost versus no boost to radiologically positive lymph nodes in FIGO stage IIIC cervical cancer" by Karthik S Rishi et al

Authors: Signorelli M, Secchi M

Journal: International journal of gynecological cancer: official journal of the International Gynecological Cancer Society

Published: 2025 Nov 4

Additional Details: 102777

10. Prosthetic rehabilitation of velopharyngeal insufficiency in a patient with locally advanced carcinoma oropharynx: a case report

Authors: Sainath J, Namani A, Munirathnam V, Rishi K

Languages Spoken

Kannada English Hindi Tamil Telugu

Dr. Karthik. S. Rishi