The Barretos Cancer Hospital Animal Facility (BCHAF) is a unique facility in Brazil exclusively dedicated to working with animal models for cancer research. In this article, we briefly present our modern facility and the main experiments performed, focusing on mutant strains of mice (PTCH-knockout and <i>Apc<sup>Min</sup></i> mice), xenograft models, and patient-derived xenografts (PDXs). Our results show the p...