and also appears to intervene in maintaining the normal shape of oocyte microvilli.

CD9 can also modulate cell adhesion and migration. This function makes CD9 of interest when studying cancer and cancer metastasis. However, it seems CD9 has a varying role in different types of cancers. Studies showed that CD9 expression levels have an inverse correlation to metastatic potential or patient survival. The over expression of CD9 was shown to decrease metastasis in certain types of melanoma, breast, lung,