Our results are in accordance with previous studies on GPRC5A in other tumors, including head and neck squamous cell carcinoma (Liu et al., 2017), pancreatic cancer (Jahny et al., 2017), lung cancer (Zhong et al., 2015), and leukemia (Chen et al., 2010). Here, GPRC5A is linked to head and neck squamous cell carcinoma.