EPHB6 and breast cancer: The other negative associations that we observed between survival/recurrence and elevated mRNA expression of ephA2, ephA4, ephA7, and ephB4 are consistent with laboratory data for some Eph family members (e.g. EphA2, EphA7), but not others (e.g. EphA4, EphB4, EphB6), in human breast cancer cell lines [31].