Dr Looi Wen Shen is a radiation oncologist at Singapore Institute of Advanced Medicine Holdings (SAM) / Proton Therapy SG.

Dr Looi treats general oncologic conditions including urologic cancers such as prostate cancer, sarcomas, lymphomas, brain tumours, liver cancer, as well as paediatric cancers. He has also received formal subspecialty fellowship training in paediatric and adult proton therapy.