FOLR1 and cancer: We queried the RNA sequencing dataset in the Cancer Cell Line Encyclopedia (https://depmap.org/portal/gene/FOLR1; ref. 20) to examine the FOLR1 expression in common HGSC cell lines (21) as well as some non-HGSC cell lines; high expression of FOLR1 was noted in most HGSC cell lines in comparison with the A2780 cell line, which was used as a FORL1low control (Supplementary Table S3; refs. 20, 22).