Loxo '292 And Cancer Drug Development Today: So Much Promise, So Many Questions

Loxo data on the RET inhibitor LOXO-292 impressed at ASCO, so much so the company is looking to talk to regulators about the results after only a single-arm Phase I trial – but it's not a silver bullet as a tissue-agnostic treatment. Data on a separate target, PI3K, underwhelmed in breast cancer. Tissue of origin remains important, though the reasons why are not entirely understood.