Ken Mastris was diagnosed with prostate cancer many years ago. He is a dedicated patient advocate. He was previously Chair of Tackle Prostate Cancer and is the current Chair of the Association of Prostate Cancer Patients in London and Essex (APPLE) which celebrates its 20th anniversary this year. Ken was the President of the European Cancer Patient Coalition in 2020/21 . He was previously Chair of Europa Uomo and has been involved in other European organisations including European Medicine Agency (EMA), European Association of Urology (EAU) and European Cancer Organisation (ECO).