How dare you wish to abort the new person in you! How dare you call it just a "collection of cells"! Wait, it's a tumour and not a foetus? Nevermind. [/fundie]
In all seriousness, best of luck (and good medical care) to get it taken care of. As others said, prostate cancer is definitely beatable, and it also sounds like it's a single tumour and so hasn't spread elsewhere. I'm confident you can kick that thing's ass.