Comparison of the transcriptional expression of SLC30A family genes in gastric tumor tissues and normal tissues indicated that mRNA expression of SLC30A1-3, 5–7, and 9 was significantly upregulated in cancer tissues compared to non-cancerous tissues in GC patients, while SLC30A4 was downregulated in the former compared to the latter (Fig. 1A and Figure S3). Here, SLC30A4 is linked to gastric cancer.