To investigate whether LOXL1 overexpression was induced by LOXL1 DNA amplification in GC tissue samples, we calculated Pearson-Correlation between DNA copy number variation and mRNA expression of LOXL1 using a publicly available online portal, LinkedOmics, that includes multi-omics data from all 32 TCGA cancer types [28]. Here, LOXL1 is linked to cancer.