Basket Trials: Advantages and Limitations
Basket trials offer a cost-effective option to evaluate targeted agents in multiple malignancies, but it is important to be aware of their limitations.
Nearly 70 different targeted agents are approved by the U.S. Food and Drug Administration for the treatment of 28 different malignancies.1 More targeted agents are being developed, though it is open to question how to best investigate these agents, particularly when the same molecular target is present in multiple cancers.
One attractive approach is the basket trial design. In a basket trial, there are multiple arms, or baskets, rather than the traditional 1 to 3 arm approach. There are multiple ways to design a basket trial, some of which include: 1) a single drug evaluated in multiple baskets, with each basket representing a different malignancy or tumor site with the same target, 2) a single drug evaluated in multiple baskets, with each basket representing a different malignancy or tumor site, some of which may have different molecular targets, and 3) multiple baskets representing multiple targeted agents that are evaluated in the same malignancies or tumor sites.2
Mithat Gonen, PhD, of Memorial Sloan Kettering Cancer Center in New York, New York, and an author of a recent commentary in the Journal of Clinical Oncology, told Cancer Therapy Advisor that “one of the primary reasons for basket trials to emerge as the leading way to conduct clinical research in precision medicine is their ability to handle multiple related questions.”
A major advantage of the basket design, Dr Gonen said, is that the question of efficacy of a targeted agent can be answered with “fewer patients and in a shorter amount of time when compared with the traditional trial design.” Statistical power can be reached with fewer subjects with less time because the data from different arms that show similar efficacy at the interim analysis can be aggregated. This enables early termination of arms not likely to show efficacy.
Fewer subjects and shorter duration may also save money. Molecular analyses and other tests need to be conducted only once in a basket trial, rather than multiple times if multiple traditional trials are conducted to answer the same question.