The brand drug industry is pivoting from justifying drug prices based on research and development costs to justifying them based on the product's value to the health care system, a move that comes as key lawmakers, health plans and large employers -- upset by rising drug prices -- urge drug makers to disclose their research spending and their rationale for prices. The drug-price debate laid dormant for years before Gilead Sciences brought it back by charging $84,000 per regimen for...