Proteostasis Therapeutics Inc. sees the early data on its proprietary triple combination of CFTR-modulating drugs in cystic fibrosis as supporting a move into Phase II this year, and Phase III next, but the lung function data in particular pales in comparison to sector-leader Vertex Pharmaceuticals Inc. – a cause for concern for analysts and investors. Proteostasis finished the trading day March 25 down more than two-thirds of its value.
While Vertex has staked a dominant lead in CF with Kalydeco (ivacaftor) and multiple combination products anchored by that compound...