Functional T cells are required for the full efficacy of CP-Dox. Immunocompetent BALB/c mice (dashed lines) or Nude (BALB/c (nu/nu), solid lines) mice lacking functional T cells were inoculated with 4T1 mammary carcinoma in the mammary fat pad. (A) Primary tumor volume and (B) Survival (n = 7 CP-Dox, 7 Free Dox, 6 PBS for Nude and BALB/c groups in D,E). Tumor growth curves analyzed by two-way ANOVA and Tukey’s post hoc, survival by log-rank. *p < 0.05.