Profile picture of Gishan Ratnayake

Dr Gishan Ratnayake

Profile picture of Gishan Ratnayake


Radiation Oncologist

Dr Gishan Ratnayake is committed to providing exceptional, patient-centred care in the field of radiation oncology using the latest treatment techniques and technology. He believes in treating each patient as an individual, taking into account their unique needs and concerns, and working collaboratively with them to achieve the best possible outcome.


Dr Gishan Ratnayake is a radiation oncologist at Icon Cancer Centre Greenslopes and Icon Cancer Centre Auchenflower. Dr Ratnayake completed his Bachelor of Medicine, Bachelor of Surgery (MBBS) at Monash University in 2009. He subsequently commenced specialist radiation oncology training across Queensland’s tertiary hospital network. During his training, Dr Ratnayake undertook research as a clinician scientist and was awarded a Master of Philosophy at the University of Queensland.

In 2018, Dr Ratnayake became a fellow at the Royal Australian and New Zealand College of Radiologists (FRANZCR) and undertook further training in stereotactic radiation therapy at the Alfred Hospital in Melbourne. He maintains a keen interest in clinical research and trials, particularly in the area of radiobiology. Dr Ratnayake has a number of peer reviewed publications and has presented his research work at both national and international conferences. Alongside his practice at Icon, he is a radiation oncologist at the Princess Alexandra Hospital and a senior lecturer at the University of Queensland’s School of Medicine.

His clinical experience covers a wide range of solid tumour malignancies, with a special interest in breast cancer, lung cancer, prostate cancer, skin cancer and head and neck cancer. He is also highly experienced in the use of stereotactic radiation therapy to achieve the best possible outcomes for his patients.


Special Interests

Dr Ratnayake accepts referrals for all cancer types, with a special clinical interest in:

  • Breast cancer
  • Head and neck cancer
  • Lung cancer
  • Prostate cancer
  • Skin cancer

Languages spoken

  • English

Icon Locations

Affiliations & Memberships

  • American Society of Radiation Oncology (ASTRO)
  • Australian Society of Breast Disease (ABSD)
  • European Society of Radiation Oncology (ESTRO)
  • Trans-Tasman Radiation Oncology Group (TROG)



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