Kai Martin Edvard Setälä (13 September 1913, Pori – 12 May 2005, Helsinki)^[1][2] was a Finnish physician and professor of pathological anatomy at the University of Helsinki. Through his daughter Christel, he was the maternal grandfather of Alexander Stubb, the 13th President of Finland.^[1][3] Setälä himself was the great-nephew of professor E. N. Setälä (1864–1935), the Counsellor of State, the Chairman of the Senate of Finland and co-author of the Finnish Declaration of Independence.^[4]

Setälä's parents were pharmacist Emil Eino Fredrik Setälä (1888–1963) and Helmi Emilia Snellman (1889–1952). Setälä graduated from Nurmes joint school in 1933 and graduated with a medical degree in 1941, when he also defended his doctorate in medicine and surgery. In 1942, he married Inger Maria Torsdotter Ekman (1922–1986). He received his qualification as a specialist in x-ray examination and treatment in 1946 and his specialist qualification in radiation therapy for cancer diseases in 1949. Setälä was a docent of radiotherapy at the University of Helsinki from 1948 to 1953, when he became a professor. Before that, he had worked for both the university and several different hospitals. Setälä held numerous positions of trust at home and abroad, he was, among other things, a founding member and vice-chairman of the Cancer Foundation [fi] at the end of the 1940s.^[1]

In the 1960s, Setälä launched a product called Antiscal for the treatment of baldness.^[3][5][6]