By Zachary Shapiro
Post-Trial Access (PTA) is emerging as an important topic in the design of ethical clinical trial protocols. PTA refers to the provision of study drug to the participants in a successful clinical trial (and maybe others) during the crucial period after a clinical trial phase is over, but before the drug is widely available or approved for the market (or maybe longer/in other circumstances). At issue is the question of the commitment a clinical trial sponsor owes the participants of their trial (and maybe others) in the period after a clinical trial phase, but before market approval of the tested pharmaceutical (or maybe longer).
While the provision of Post-Trial Access may seem to be an ethical “no-brainer,” there are numerous variables that make the decision of whether to provide PTA difficult. One major question is whether all arms of the trial deserve access to the therapy, even those who were on placebo or in the control arm. If the therapy tested shows less efficacy than a more or less expensive treatment modality, is there a responsibility to provide the more effective treatment, regardless of the cost? What if said therapy is far beyond the standard of care for the condition in the particular country where the trial took place? Furthermore, how long do PTA obligations extend? While the simple answer is that they end after market approval, the truth is that many drugs have long approval processes, with complicating factors that can result in significant delays. This is an even more difficult question if the trial is a multi-regional study, and takes place in a country where the sponsor does not intend to market the product.
The question of how to provide PTA also poses logistical issues, as many sponsor sites close after a clinical trial is finished. This can make provision of post-trial access extremely expensive, and perhaps unduly burdensome, especially if the trial is sponsored by a biotech start-up without the deep pockets of a large pharmaceutical company. These costs can skyrocket depending on whether we believe the sponsor should be responsible for costs that might result from improper use of the therapy, or failure of the participants to comply with proper treatment. Continue reading