HIF1A and neoplasm: Correlation analysis between HIF-1α and SDH expression and clinicopathologic factors revealed an association of nuclear HIF-1α expression with PR negativity (P = 0.011), and of low or negative SDHA expression in the tumor with ER positivity (P = 0.044), HER-2 negativity (P = 0.021), and higher T stage (P = 0.031).