Peroxisome proliferation requires PEX11-type peroxisomal proliferators [82] and herein, endogenous Pparγ1 induced peroxisomal target genes in the mammary tumors as evidenced by increased expression of PEX-11, together with PPARGC1 and ESRR induced regulator, muscle 1, PGC-1 and ERR-induced regulator in muscle 1 (Perm1). Here, PERM1 is linked to breast cancer.