Graduated from the Faculty of Medicine, University of Tartu and completed oncology residency. Spent a month in the world’s most prestigious cancer centre – the MD Anderson Cancer Centre for melanoma treatment and research. Spent a month attending refresher training on skin cancer, melanoma and pigmentary disorders at the National Skin Centre, Singapore and the National Cancer Centre, Singapore. Training in oncodermatopathology and dermatoscopy at the University of Graz in Austria for 2 months and 13 months in breast cancer in collaboration with the European School of Oncology and the University of Ulm. Participated in oncology conferences around the world. Gave presentations on oncology to doctors, teachers and students.

Dr Vettus has been the chief organiser of several charity events, supporting the Estonian Association of Parents of Children with Cancer. Dr Vettus is also the initiator of a proposal to ban tanning beds for minors.

He is a member of the Estonian Society of Oncologists, the European Society of Oncologists, the European Society of Radiotherapy and Oncology, the American Society of Clinical Oncologists, the International Dermatoscopy Society and the Estonian Medical Association.