Interestingly, the collagen gene cluster expressions were significantly associated with the presence of cirrhosis (p = 0.0085, 0.04, and 0.0283 for COL6A1, COL6A2, and COL6A3, respectively) but not with the survival of BA patients and age at Kasai procedure (Table 3). Here, COL6A2 is linked to breast angiosarcoma.