According to the Human Gene Database (available at https://www.genecards.org/Search/Keyword?queryString=SLC35E2, accessed on 10 March 2021), SLC35E2A (Gene ID: 9906) and SLC35E2B (Gene ID: 728661) should be the correct entities for the TCGA HNSCC dataset. Here, SLC35E2A is linked to head and neck squamous cell carcinoma.