MEN1 and neoplasm: Differences in tumour development between strains were also not limited to one sex, since male 129S6/SvEv Men1+/- mice developed significantly more adrenal tumours than C57BL/6 Men1+/- mice, while significantly more female 129S6/SvEv Men1+/- mice developed ovarian tumours compared to female C57BL/6 Men1+/- mice.