Agreed that for most tumor types targeting single antigens is a fool's errand, but the claim that "here is absolutely no fitness cost" for mutational evasion se

Agreed that for most tumor types targeting single antigens is a fool's errand, but the claim that "here is absolutely no fitness cost" for mutational evasion seem like is an overstatement. This is clearly false when using bacterial resistance to antibiotics as a more tractable proxy.