PDCD1 and neoplasm: In the other groups (n = 7), all mice died from tumor growth, with an average survival of 28.4 ± 0.7 (standard error) days with PBS control, 30.3 ± 2.5 days with B. longum 2012, and 36.0 ± 4.4 days with anti-PD-1 antibody alone (Figure 3B).