Additional file 8: Fig. S6. Effect of PD-L1 and MT Oas2 on primary tumor initiation and expansion in parous mice. Two-way Kaplan–Meier survival analysis for the indicated periods and endpoints, and for the indicated genotypes and treatments (PD-L1 or IgG IP), of mouse cohorts. P values and hazard ratios (HR) calculated by the log-rank test using GraphPad Prism. n = 8 WT PD-L1, 8 WT IgG, 14 MT PD-L1, 15 MT IgG.