NEW YORK (GenomeWeb) – Ideally, molecularly informed drug development is supposed to provide pharmaceutical companies with more confidence about how well their therapies work in a specific patient population. But the recent failure of Bristol-Myers Squibb's immunotherapy Opdivo (nivolumab) to meet its primary endpoint in a late-stage non-small cell lung cancer trial highlights the pitfalls drugmakers face amid evolving science and imperfect biomarkers.