Sorry to hear mang. My dad just got over a battle with colon cancer then liver cancer right after. Depending on the stage of it he has a good chance of making it through. Kemo will shrivle him up a bit but everything should be ok. Half the battle with cancer is in the mind. Keep him optimistic. Its disheartening hearing this shit.
Also be aware that lots of cancers are genetic. If he's having severe issues now, get yourself checked out before its too late. Cancer runs in my family so frequent checks are scheduled for the rest of my life.
Be strong brother. If you need support, I've been there.