Dose Optimization of Targeted Therapies for Oncologic Indications

Simple Summary The majority of oncology drugs approved by the Food and Drug Administration over the past quarter century have been targeted therapies, designed to act on cancer cells with specific molecular abnormalities. Although these newer agents have different properties compared to cytotoxic chemotherapy, the same methodology used for dose-finding during drug development has continued to be used. Growing awareness of the inadequacy of traditional dose selection processes for modern cancer drugs has been the catalyst for the creation of new regulatory guidance aimed at reforming current practices. This review summarizes six cases, illustrating different approaches to targeted therapy dose optimization.Abstract Therapeutic advances in oncology in the 21st century have contributed to significant declines in cancer mortality. Notably, targeted therapies comprised the largest proportion of oncology drugs approved by the United States (US) Food and Drug Administration (FDA) over the past 25 years and have become the standard of care for the treatment of many cancers. However, despite the metamorphosis of the therapeutic landscape, some aspects of cancer drug development have remained essentially unchanged. In particular, the dose-finding methodology originally developed for cytotoxic chemotherapy drugs continues to be implemented, even though this approach no longer represents the most appropriate strategy for modern cancer therapies. In recognition of the need to reconsider assumptions, adapt the dose selection process for newer drugs, and design alternative strategies, the FDA has undertaken several initiatives in recent years to address these concerns. These actions include the launch of Project Optimus in 2021 and the issuance of draft guidance for industry on dose optimization of oncology drugs in 2023. Amid this evolving regulatory environment, the present manuscript reviews case studies for six different targeted cancer therapies, highlighting how dose-finding challenges have been managed to date by oncologists, sponsors, and regulators.