Previous studies have suggested that CTSL is required for cell cycle progression of colorectal cancer cells (Tamhane et al., 2016) and glioma cells (Zhang et al., 2015), with a similar observation made in our examination of CTSV in thyroid carcinoma cells (Al-Hashimi et al., 2020a). The gene discussed is CTSV; the disease is thyroid gland carcinoma.