STAT3 and malignant colon neoplasm: Next, although STAT3 expression in NK cells was lower in patients with gastric, sigmoid, and colon cancer in comparison to the healthy volunteers group, the difference did not reach statistical significance: MFI values were 827 ± 614 in patients (n = 4) versus 2523 ± 1609 in healthy donors (n = 13) (p = 0.061) (Fig. 5).