SLC12A6 and esophageal squamous cell carcinoma: Regarding the expression of KCC3 in CN, we divided ESCC patients into 2 groups using the median staining score, a low grade KCC3 expression group with staining scores ≤1.000, n = 36, and a high grade KCC3 expression group with staining scores >1.000, n = 34, and compared their clinicopathological features (Table 1).