No, cáncer should not make any difference to the "normal" smell. Drinking plenty of wáter will dilute the smell, but there are various other factors which affect smell- a fishy smell can be an indication of an infection. Some foods and drugs also affect the final "perfume" - one of the most noticeable is asparagus I believe ( don·t eat it so can·t speak from experience!)It is worth mentioning to your urolgist though, particularly if there may be an infection.
I think you should drink a lot. If your urine is diluted it won't smell that bad. I did not understand the importance of drinking a lot until the bladder cancer. A lot of harmful chemicals accumulate in the urine and they affect the bladder lining. Now I drink a lot and my pee is very clear. But I also take chemotherapy drugs for another cancer plus my regular drugs for blood pressure, and heart and other things. I was told by my doc to drink a lot of water.
66yo female, 1992-Non-Hodg. lymphoma(NHL) high grade, chemo, rads, 2007 NHL, low grade, rads, 2013 NHL low grade, stage 4, chemo till Jan 2015; 2014 TCC, first Turb 01/29/2015.