Secondary Endpoints Backed Kalydeco’s Efficacy, Despite Lack Of Correlation With Pulmonary Function

Although a decrease in sweat chloride levels was suggestive of benefit, this did not correlate with improvements in FEV1 function, FDA said. The agency also noted that the patient-reported outcomes instrument used in the pivotal clinical trials, though not fully validated, measured respiratory symptoms that are clinically relevant to patients.

Vertex Pharmaceuticals Inc.’s cystic fibrosis drug Kalydeco (ivacaftor) demonstrated generally positive effects on a slew of secondary endpoints in two pivotal trials, and yet it remains a question mark how, and whether, some of these measures translate into clinical benefit.

During the course of their review, FDA staff raised questions about the clinical meaningfulness of changes in sweat chloride and...

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