TSLP and neoplasm: As expected, the induction of TSLP in Tslp-PyMttg mice resulted in markedly delayed tumor onset (P = 0.0003; Fig. 8 A), fewer breast tumors per animal (P < 0.0001; Fig. 8 B), and extended survival associated with low-grade breast tumors compared with PyMttg and PyMttg TslprKO mice (P < 0.0001; Fig. 8, C and D).