Figure 4 presented expression of ARID1A and H2B on the same case of invasive ductal carcinoma in serial sections of tissue array. The positive correlation of protein expression of ARID1A and H2B was well presented (Table 2). Both ARID1A and H2B presented nucleus or nucleus/cytoplasm expressing pattern. The expression status of ARID1A and H2B in serial sections of tissue arrays was summarized in Figure 5, in which each case has two tissue points on the same line. This evidence concerns the gene H2BC21 and invasive ductal breast carcinoma.