ERBB2 and breast cancer: No significant correlation was found between JAK1 expression and other clinicopathological factors, including age (P = 0.357), menopausal status (P = 0.514), histological grade (P = 0.662), ER status (P = 0.516), PR status (P = 0.708), HER2 status (P = 0.248), and breast cancer subtype (P = 0.567).