Sympathy is really hard to convey over the internet but I understand what you're going through. I have lost both my grandads because of cancer (lung) and also my cat (I think it was something to do with her stomach). Atleast you're (presumely) old enough to understand what is going on and can spend more time with him, sadly I didn't have that advantage.
I really hate cancer. Apart from the extremely obvious downside of a loss of loved ones, but if they pass away on a national holiday, for example halloween in my case, it can effectively ruin it. I honestly can't enjoy that day anymore but thats all I can think about.
This is true, however I think the people here have adequately expressed their feelings on the matter.Several of those that have posted here seem to have lost a loved one under similar circumstances.
I'm no fan of cancer either, it's an ugly thing to watch what can and does happen to those that it claims.
I lost my father 15 days before Christmas. Needless to say that Thanksgiving, Christmas, and New Years are all pretty rough for the family now; although the pain after 8 years has subsided a bit, It still hurts, especially for mom, who spent her entire advlt life with dad, and whom survived cancer herself.