** Shares of precision oncology firm Black Diamond Therapeutics BDTX.O rise 3.8% to $3.58 premarket
** Co says its experimental cancer drug silevertinib met main goal with 60% tumor response and 86% brain response in 43 lung cancer patients with rare EGFR mutations
** EGFR is a protein that helps cells grow; mutations can drive cancer
** Separately, co says it plans to start a mid-stage trial of silevertinib in patients with glioblastoma, an aggressive form of brain cancer, in the first half of 2026
** Up to last close, stock up 61% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))