A recent study, however, has demonstrated the expression of PPARβ in mouse models of ovarian tumours as well as the that PPARβ mRNA and protein to be expressed in tumours generated in vivo by mouse ovarian cancer cell lines, whereas low-to-undetectable levels of PPARβ were expressed in normal mouse ovaries and non-tumourous ovarian samples (Daikoku et al, 2007). This evidence concerns the gene PPARD and ovarian neoplasm.