Screening failure in clinical trials for patients with head and neck squamous cell carcinoma: A retrospective analysis.

Abstract

e18009 Background: Clinical trials drive improvements in patient care with head and neck squamous cell carcinoma (HNSCC), presenting opportunities for optimizing clinical outcomes. However, a significant number of patients (pts) miss out on new therapeutic opportunities due to screen failure (SF) after signing the informed consent form. Understanding the circumstances leading to SF might improve enrollment processes. Methods: Retrospective cohort analysis of pts with HNSCC intended for treatment within a clinical trial at the Royal Marsden Cancer Centre but who experienced SF between Jan 2016 and Jan 2024. Demographic and cancer-related characteristics, comorbidities, consent and SF dates, SF causes, and subsequent outcomes after SF were analyzed. Results: 76 pts who experienced SF were identified across 33 different trials. Cohort characteristics and type of trials offered are described in the table. The largest number of SFs was due to exclusion criteria being met in screening tests in 37 pts (49%): Pathology sample did not meet the quality standards in 11 pts (14%); abnormal laboratory tests in 5pts (6%); abnormal echocardiogram/reduced ejection fraction in 5 pts (6%); vessel invasion/ encasement in 4 pts (5%); non-measurable disease in 2 pts (3%); abnormal audiometry in 1pt (1%) among other reasons. The next commonest cause of SF was rapid progression during screening in 28 pts (37%): 11% compromised airway; 11% active bleeding; 5% central nervous system progression and 7% other rapid progression causes. Other causes of SF included: withdrawn consent in 7 pts (9%), comorbidity-related complication in 3 pts (5%) and study termination by sponsor in 2 pts (3%). The median time between consenting and SF was 20 days (range 4-42). After SF, 8% reconsented for the same trial, 56% received standard therapy, and 36% received best supportive care. Conclusions: This study reveals abnormal screening tests and rapid progression as primary causes for SF in patients with HNSCC. Timely referral , airway assessments and improved tissue acquisition could improve enrollment and minimize SF. [Table: see text]