Patient-reported outcomes in PD-1/PD-L1 inhibitor registration trials: FDA analysis of data submitted and future directions.
134 Background: Patient-reported outcome measures (PROs) can capture the patient’s experience with disease and treatment. Anti-PD-1/PD-L1 therapies have unique symptomatic side effects; PRO data can help to better understand the patient experience on therapy. Health-related quality of life (HRQL) components most impacted by therapy include disease symptoms, symptomatic toxicity and physical function. Methods: We reviewed FDA registration trials for 5 immunotherapy agents (anti-PD-1/PD-L1) to evaluate trial design and PRO assessment. We assessed whether the PRO strategy assessed physical function and symptomatic immune-related adverse events (irAEs) by reviewing whether trials used a well-defined physical function domain and 8 symptoms related to irAEs reported in product labels (fatigue, diarrhea, cough, shortness of breath, musculoskeletal pain, rash, pruritis and fever). Results: Data from 25 trials across 7 disease types and 1 tumor agnostic indication were evaluated. Of these, 13 were randomized and 22 were open label. Eighteen of 25 contained PRO assessments and all 18 used > 1 instrument. The most common instruments were the EQ-5D (N = 17), followed by EORTC QLQ-C30 (N = 15). Disease-specific PRO tools were included in 8 trials (5 lung, 1 head and neck, 1 melanoma and 1 renal cell), consisting of modules or scales from EORTC (N = 5), FACIT (N = 2) or the Lung Cancer Symptom Scale (N = 1). Sixty percent of the trials (15/25) used an instrument that contained a well-defined physical function (PF) domain. No trial used a PRO strategy assessing all 8 selected symptoms related to irAEs. Conclusions: Collection of PRO data in anti-PD-1/PD-L1 trials submitted to FDA was variable, and did not consistently assess treatment related symptoms and physical function. Use of a HRQL tool with well-defined functional scales supplemented by item banks or libraries to incorporate symptoms associated with irAEs may improve understanding of the patient experience while receiving anti-PD-1/PD-L1 treatment. These data, along with other important clinical data such as hospitalizations, ER visits and supportive care medications can inform the benefit risk assessment for regulatory purposes.