PTPN1 and metabolic dysfunction-associated steatotic liver disease: Furthermore, PTP1B plays an essential role in the development of various diseases, such as inflammation, cardiovascular diseases, prostate cancer, breast cancer, neurological disorders, metabolic dysfunction‐associated steatotic liver disease (MASLD), and cellular senescence.[12, 13, 14–15] Therefore, PTP1B has attracted particular attention as a therapeutic target.