According to the article, he's no longer getting chemotherapy, so I guess his tumors are stable for the time being. But managing his other symptoms and side effects is no doubt equally demanding.

UPDATE: Apparenty Jon persuaded Mario that he wouldn't take offense if he were to be visited by his friend Philadelphia DJ Pierre Robert. And apparently Mario was able to persuade Jon to visit HIS friend Antonio Santos, a 17-year old undergoing treatment for a form of bone cancer -- which sucks particularly since he's an aspiring drummer.