In a cohort of patients with 51 tumour sections and 37 sections of adjacent normal tissues, low YTHDC1 level was detected in malignant tumour by IHC assay (Figure S3G,H), as well as in 16 paired tumour/peri‐tumour samples by quantitative real‐time PCR (Figure S3I). The gene discussed is YTHDC1; the disease is cancer.