TERF1 and breast cancer: To understand how tRF‐1‐Ser and MBNL1 interact and regulate biological functions, we analysed transcriptome data from TCGA containing 1231 breast cancer cases, categorised based on the average TPM values of MBNL1 into high‐ and low‐expression groups (MBNL1_high and MBNL1_low, respectively).