CA9 and neoplasm: Any nuclear FIH-1 expression was inversely correlated with CA9 expression (P = 0.04), with tumours negative for CA9 also being twice as likely to express FIH-1 within the nucleus (P = 0.04, odds ratio (OR) = 2.22, 95% confidence interval (CI) = 0.21–0.96) (Table 3).