Effect of in vivo blocking of B7-H1 and B7.1 on overall survival. (A) Survival curve of naive mice (10/group) injected intraperitoneally with 10⁵ DA1-3b/d365 cells with either blocking antibody against B7-H1 or a control isotype. (B) Survival curve of naive mice injected intraperitoneally with 10⁵ DA1-3b/d365 cells with either blocking antibody against B7.1 or a control isotype. (C) Survival of naive mice injected intraperitoneally with 10⁵ DA1-3b/d365 cells with either blocking antibody against CTLA-4 or a control isotype. (D) Survival of naive mice injected intraperitoneally with 10⁵ DA1-3b/d365 cells with either blocking antibodies against B7-H1 and B7.1 or a control isotype.