Well, does a non-malignant HeLa tumor that's been artificially transplanted count? Because if so, we may have both lost our hypotheyical bets. :] https://www.qu

Well, does a non-malignant HeLa tumor that's been artificially transplanted count? Because if so, we may have both lost our hypotheyical bets. :] https://www.quora.com/Is-it-possible-that-the-HeLa-immortal-cell-line-could-cause-an-infection-or-cancer https://www.quora.com/Is-it-possible-that-the-HeLa-immortal-... (I can't find numbers of how many tumor masses lasted, but hundreds of prisoners were injected.)