Helen Soteriou neé Mellor was a clinical oncologist at St Luke's Hospital, Guildford, and Nicosia General Hospital, Cyprus. She was born in Liverpool on 11 April 1920, the daughter of Stanley Alfred Mellor, a Unitarian minister, who died when she was just four years old, and Anita Mellor née Thomson. She was educated at Rotherham Grammar School for Girls and went on to study medicine at the Royal Free Medical School. She gained her MRCS LRCP in 1943. Between 1944 and 1947 she served in the Royal Army Medical Corps, with the rank of captain. She gained her FRCS in 1952 and then trained in radiotherapy. She was a registrar at the Royal Marsden Hospital and a senior registrar in the radiotherapy department at Westminster Hospital. In 1955 she was appointed to her consultant post at St Luke's. She became head of the department there in 1959. In 1969 she married Andreas Soteriou, a Cypriot businessman, and emigrated to Cyprus, where she co-founded the radiotherapy and oncology department at Nicosia General Hospital. She later established the first private radiotherapy unit at the Evangelista Clinic. She retired in 1995 and was awarded an OBE in 1998. In addition to her clinical work, she was also actively politically, and joined in protests against the Turkish occupation of the northern half of the island. Helen Soteriou died on 19 November 2012, aged 92.