Fig. 1. Comparison of sarcosine metabolism-related proteins among normal breast tissue, invasive ductal carcinoma (IDC), and invasive lobular carcinoma (ILC). ILC was found to have a higher expression rate of PIPOX than IDC. H&E, hematoxylin and eosin; GNMT, glycine N-methyltransferase; SARDH, sarcosine dehydrogenase; PIPOX, l-pipecolic acid oxidase.