Toripalimab Combined With Radiotherapy and S-1 for Older Patients With Esophageal Cancer

JS001, the active ingredient of toripalimab injection, independently developed by Shanghai Junshi Biomedical Technology Co., Ltd, is an independently developed novel recombinant humanised (degree of 97%) anti-PD-1 monoclonal antibody (Chinese Patent License No. CN104250302B, PCT Patent Publication No. WO2014/206107A1), belonging to the human IgG4/Kappa subtype, and introducing a point mutation at the Serine to Proline (S228P) protein site 228 in the hinge region of the IgG4 heavy chain.