Evaluating PD-1/PD-L1 in Locally Advanced Rectal Cancer by Quantitative Fluorescence Molecular Endoscopy
Status:
NOT_YET_RECRUITING
Trial end date:
2025-06-01
Target enrollment:
Participant gender:
Summary
Colorectal cancer (CRC) claims 10% of global cancer-related deaths annually, with rising incidence. Locally advanced rectal cancer (LARC) requires improved diagnostic techniques. This study focuses on dual-wavelength quantitative fluorescence molecular endoscopy (qFME) using PD-1/PD-L1-targeted tracers for LARC patients undergoing neoadjuvant treatment. Eighteen patients will receive nivolumab-800CW and durvalumab-680LT before qFME procedures, assessing programmed death-1/programmed death ligand-1 (PD-1/PD-L1) expression. We want to test the feasibility of qFME and ex vivo fluorescence imaging after intravenous administration of nivolumab-800CW, targeting PD-1, and durvalumab-680LT, targeting PD-L1, to visualize PD-L1 and PD-1 expression before and after CRT in LARC patients. If successful, this method can potentially be used in the future to see which patients most likely benefit from additional immunotherapy beforehand. The non-randomized, prospective phase 1 intervention explores biomarkers' role in treatment response prediction. Tracer administration poses minimal risks. Patients will not directly benefit, but the study aims to establish the utility of nivolumab-800CW and durvalumab-680LT in determining PD-1/PD-L1 expression during endoscopy.