The mean cyst amylase levels in both the positive and negative string sign groups were similar (43671 ± 110,505 unit/lit vs. 39,303 ± 76,505 unit/lit, respectively, p = 0.4), however, the cyst level of CEA was significantly higher among the positive string sign group (1283 ± 2536 ng/mL) vs. the negative string sign group (449 ± 1216 ng/mL) (p = 0.03). This evidence concerns the gene CEACAM5 and cyst.