Conference Proceedings

Phase II trial PD-L1/PD-1 blockade avelumab with chemoradiotherapy for locally advanced resectable T3B-4/N1-2 rectal cancer: The Ave-Rec trial.

Michael Michael, Rachel Wong, Sanjeev Singh Gill, David Goldstein, Sam Ngan, Alexander Graham Heriot, Emma Link, Maria Farrell, Paul J Neeson, Robert George Ramsay, Kasmira Wilson, Catherine Mitchell, Jeanne Tie, Nick Pavlakis, John Raymond Zalcberg, Eva Segelov

JOURNAL OF CLINICAL ONCOLOGY | AMER SOC CLINICAL ONCOLOGY | Published : 2019

Abstract

TPS3622 Background: Standard neoadjuvant long course chemoradiotherapy (LCCRT) for locally advanced rectal cancer (LARC) results in a complete pathological response rate of 10-30%: but 20-40% of patients (pts) are non-responders, 10-15% have local recurrence. Tumoural immune infiltrates are predictive of response. Preclinical studies show that radiotherapy (RT) via interferon signaling is immuno-stimulatory, enhancing local/distant tumour cell death. RT also stimulates PDL1 production and the immunosuppressive activity of myeloid derived suppressor cells. Hence PDL1 inhibition may be required to enhance the immuno-stimulatory effects of RT. Hypothesis: In pts with resectable LARC, the anti-..

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