Alnylam Pharmaceuticals is surging nearly 16% in pre-market trading. The rally comes after AstraZeneca and Ionis jointly announced that their ATTR-CM (transthyretin amyloid cardiomyopathy) drug, Wainua (eplontersen), failed to meet its primary efficacy endpoint in a pivotal Phase III trial. This development signals a significant easing of competitive pressure for Alnylam in the field.