Since galectins, e.g., galectin-3, are often co-expressed with CD34 in cancers such as hepatocellular carcinoma [70] and can contribute to the tumor’s ability for immune invasion by increasing matrix metalloproteinase activities [71], there may be direct associations that merit further investigation, especially given the fact that serotonylation may increase PD-L1 expression [72]. The gene discussed is CD34; the disease is cancer.