SOX9 and esophageal squamous cell carcinoma: Quantification of this series of cases showed that SOX9 expression was positively associated with elevated nuclear YAP (r = 0.20, P = 0.009; Fig. 3g), which is consistent with the array data extracted from a publicly available ESCC dataset [21] (r = 0.366, P = 0.046; Fig. 3h).