IDO1 and gastric cancer: Using the genome-transcriptiomic data of gastric cancer (GC) cell lines from Cancer Cell Line Encyclopedia (CCLE), Xiang et al. found that upregulated COL12A1 and LOXL2 were associated with IDO1 expression, and further biological experiments verified that IDO1 and COL12A1 could synergistically improve GC metastasis (11).