LONDON , England ( CNN ) -- David Prowse , who played Darth Vader in the original `` Star Wars '' films , has revealed he is suffering from prostate cancer but is still feeling `` fantastic . '' David Prowse signs autographs during the opening day of `` Star Wars Celabration IV '' in Los Angeles in 2007 . Prowse , who wore the black suit and helmet to play the Dark Lord of the Sith , told a British radio station he had been undergoing radiotherapy at a hospital in south London and was helping its fundraising appeal . `` I 'm involved with the Royal Marsden Hospital appeal because I 'm undergoing treatment for prostate cancer , would you believe , '' he told Absolute Radio . `` I 'm having my very last treatment this morning . '' `` I 've had two months ' radiotherapy treatment at the Royal Marsden . It 's the most fantastic hospital you could ever wish to go to . '' James Earl Jones did the voice for Vader , Luke Skywalker 's father , ( and also for CNN promotional links ) in the films as Prowse 's western English accent was thought to be unsuitable for the part . Prowse , 73 , added he was fighting the disease . `` The only thing I 've had is hot flushes and my wife tells me I 'm going menopausal , '' he said . `` It 's amazing what can be done so long as you catch it early . '' `` Every man over the age of 50 should have a PSA test ( a blood test for prostate cancer ) and that just gives you some indication of whether you have prostate problems . ''
David Prowse , who played Lord Holden in ` ` Star Wars , '' has terminal cancer . Prowse says he is undergoing radiotherapy at home in south London . Actor said every man over 50 should have a blood test for his cancer .