Demographics of clinical trials participants in pivotal clinical trials for new molecular entity drugs and biologics approved by FDA From 2010 to 2012.

To fully assess the safety and efficacy of therapeutics before approval, the US Food and Drug Administration (FDA) has encouraged adequate representation and assessment of demographic subgroups in clinical trials through guidance documents and regulations. This study aimed to survey the demographics of participants in pivotal clinical trials, as well as the presence of analyses by sex on efficacy and safety for FDA-approved new drug applications (NDAs) and biologics license applications (BLAs) from 2010 to 2012. Medical and statistical reviews for new molecular entity drugs and biological products approved during this period were obtained from Drugs@FDA. All pivotal clinical trials referenced in the FDA reviews were evaluated for the participation of different demographic subgroups (such as sex, race/ethnicity, and age). Pivotal trials were defined as those phase 2 and/or phase 3 trials described in the labeling or the FDA medical reviews in support of the drug/biological approval. Eighty-three new molecular entities (66 NDAs and 17 BLAs) were approved by the FDA from 2010 to 2012. Overall, women constituted 45% of trial participants for NDAs and 65% for BLAs. Sex analysis related to safety and efficacy was reported in 92% of the surveyed FDA medical and statistical reviews. Most NDAs and BLAs (82%) had a study population that was representative of the sex distribution for the intended patient population; however, most study participants were whites (77%), and minority racial/ethnic groups had lower participation rates in the study population than would be representative of the US racial group populations.

Response-guided telaprevir therapy in prior relapsers? The role of bridging data from treatment-naïve and experienced subjects.

The purpose of this report is to illustrate the US Food and Drug Administration's rationale for approving response-guided therapy (RGT) for telaprevir (TVR) in combination with pegylated interferon-α and ribavirin (P/R) for the treatment of adults with genotype 1 chronic hepatitis C who were prior relapsers. RGT was prospectively evaluated in two registration trials of treatment-naïve subjects. In these studies, RGT allowed subjects who achieved undetectable hepatitis C virus RNA from weeks 4 and 12, known as extended rapid virologic response (eRVR), to stop all treatments at 24 weeks. A patient without eRVR received an additional 36 weeks of P/R after 12 weeks of a TVR triple regimen (total of 48 weeks). However, RGT in prior P/R relapsers was not prospectively evaluated. Empirical cross-trial data indicated high sustained virologic response rates (>90%) in prior relapsers achieving eRVR, irrespective of P/R duration (24 or 48 weeks). Further analyses demonstrated that interferon responsiveness does not change in P/R-experienced subjects with a second round of P/R. The comparability in interferon responsiveness across treatment courses allowed us to bridge data between treatment-naïve and P/R-experienced subjects to support the approval of RGT in prior relapse subjects.