Lastly, about 40% of mouse mammary tumor virus (MMTV) driven Wnt1 tumors have cooperative activation of fibroblast growth factor signaling [38], a phenotype that is known to decrease tumor latency [16], and consistent with this, 88% (7/8) of TgMMTV-Wnt1/iFgfr2 tumors in our dataset were also classified as Wnt1-EarlyEx. Here, WNT1 is linked to neoplasm.