The fundamental problem in drug discovery for cancer is that the model systems are not predictive at all. ancer research at Merck Research Laboratories in West Point, Pennsylvania…Researchers blamed the failures on the fact that the drugs were being tested against mouse, not human, tumors… the xenograft tumors don't behave like naturally occurring tumors in humans – they don't spread to other tissues, for example. Thus, drugs tested in the xenografts appeared effective but worked poorly in humans.

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