Association of tumor mutational burden (TMB) and clinical outcomes with tislelizumab versus chemotherapy in esophageal cell carcinoma (ESCC) from RATIONALE-302 (AACR 2023)
P3 | "TMB status may play a role in predicting clinical outcomes in pts with advanced ESCC treated with TIS versus ICC, especially when a higher TMB cutoff is chosen. These findings need further prospective validation.Table. Clinical outcomes by TMB status (cutoff 10 mut/Mb)TMB statusTMB-HTMB-LTreatmentTISICCTISICCn (% in TMB BEP, N=209)27 (12.9)31 (14.8)78 (37.3)73 (34.9)ORR, % (95% CI)33.3 (16.5, 54.0)6.5 (0.8, 21.4)16.7 (9.2, 26.8)17.8 (9.8, 28.5)Median PFS, months (95% CI)2.4 (1.4, 5.5)2.3 (1.3, 2.9)1.4 (1.3, 2.7)2.7 (1.5, 3.3)PFS HR (95% CI)0.52 (0.28, 0.97)1.06 (0.73, 1.53)Interaction p-value0.0537Median OS, months (95% CI)6.1 (4.2, 18.6)4.7 (3.4, 7.0)8.6 (4.6, 11.8)7.0 (4.6, 8.6)OS HR (95% CI)0.58 (0.32, 1.04)0.72 (0.50, 1.03)Interaction p-value0.5374TMB-adjusted OS HR (95% CI)0.68 (0.5, 0.92)BEP, biomarker evaluable population; CI, confidence interval; HR, hazard ratio; ICC, investigator chosen chemotherapy; OS, overall survival; PFS, progression-free survival;..."