Hi there. My Dad had prostate cancer . He is 79 Recent PSA levels have dramatically rised from 104 six months ago, 1064 one month ago and yesterday it shot up to 1600, thats a rise of 600 in 3 weeks! They have told him without Cemo it could be 3 to 6 months. Today he felt v tired and he is starting to feel pain in his lung areas, low down in his back. This is a big PSA jum isn t it? Realistically, is 6 months optimistic?