Progress in drug development often hides inside failures. A therapy that fails in one clinical trial can provide critical scientific learnings. One company leveraged insights from a failed study to redesign a subsequent trial, which was successful and led to the drug's approval.

By elevating the riskier peak VO2 endpoint to a co-primary with KCCQ, Cytokinetics only needs to hit one for the trial to succeed. This clever design increases the probability of a positive top-line result for its non-obstructive hypertrophic cardiomyopathy indication, a sizable market.

An FDA panel voted against Capricor Therapeutics' Duchenne drug, primarily because the company altered its statistical analysis plan after the study was complete but before unblinding. The FDA viewed this as a potential manipulation to achieve a more favorable outcome, critically undermining the credibility of the efficacy data presented.

For rare diseases without established clinical endpoints, biotech firms should co-design new endpoints with patients and their families. Presenting these patient-centric measures to the FDA builds a bond of trust and provides the agency with a clear, meaningful rationale for drug approval.

After joining Amarin, Doogan immediately faced a failed Phase 3 program. Instead of closing down, the team re-evaluated their existing science and successfully repurposed a product originally for Huntington's disease to treat hypertriglyceridemia, ultimately leading to FDA approval and commercial success.

Despite FDA readiness for a final Phase 3 trial, Connect Biopharma chose to run more Phase 2 studies. They discovered their long-term asthma drug worked in hours, not weeks, and are now pivoting to prove its value in acute, emergency situations, which informs a stronger, more targeted Phase 3 design.

Recent Phase III results show that missing a primary endpoint isn't a death sentence. Gossamer Bio is in FDA discussions after its PAH drug missed a statistical threshold, while Novo Nordisk plans a new, higher-dose trial for its obesity drug after it failed to show non-inferiority against a competitor. This highlights strategic resilience in late-stage development.

While acknowledging that repurposing a failed drug feels like a "leap of faith," Declan Doogan stresses it's not a blind gamble. The successful pivot at Amarin was based on a "thorough and rigorous assessment of the science evidence based thinking," highlighting that radical strategic shifts must be built on a strong scientific foundation.

Repro Novo licensed a drug that did not meet its primary endpoint in a prior Phase 2b trial. They identified a positive signal in an exploratory endpoint—improved semen quality—and built their new clinical strategy around making that the primary endpoint, salvaging a potentially valuable asset.