Job and prostate cancer

Hi I've just been accepted for a new job and my new employer has sent me a medical form to fill in ,one of the questions asks if I have cancer,I was diagnosed a year and a half ago with prostate cancer I'm on 6 monthly PSA blood test monitoring I need no treatment I'm fine but I'm worried my new employer will change his mind about me. I have to hand my notice to my present employer in two days time I really want this job but I do not want to end up unemployed.Any advice on what to do would be much appreciated.

Thanks