CAV1 and breast neoplasm: In order to specifically assess the role of Cav1 in the tumor stroma on intratumoral microenvironment remodeling and metastasis, Goetz and colleagues utilized a subcutaneous xenograft model in which primary mouse embryonic fibroblasts (pMEFs) derived from either wild type (WT) or Cav1 knock out animals (Cav1 KO) were coinjected subcutaneously with luminescent LM-4175 metastatic breast tumor cells (Minn et al., 2005) with Matrigel into nude mice (Goetz et al., 2011).