SLC60A1 and thyroid cancer: To determine the role of MFSD4A-AS1 in lymphatic metastasis of PTC cells, we first examined the expression levels of MFSD4A-AS1 in a normal thyroid follicular epithelial cell line PTFE and seven thyroid cancer cell lines and found that MFSD4A-AS1 expression levels were higher to a different extent in thyroid cancer cells than that in PTFE cells (Supplementary Fig. 2A).