He found that NKD1 was up-regulated in the colorectal cancer cell line SW480, gastric cancer cell line TMK1, and pancreatic cancer cell line Hs700T, while NKD2 was up-regulated in the gastric cancer cell line MKN45, pancreatic cancer cell line BxPC-3, and esophageal cancer cell lines TE6, and TE13, indicating NKD1 and NKD2 might be candidate tumor suppressors [70]. This evidence concerns the gene NKD2 and neoplasm.