MMP7 and breast angiosarcoma: Yang L et al. detected serum MMP-7 levels in 135 infants under six months of age with cholestasis and established the optimal MMP-7 cutoff value in BA patients as 52.85 ng/mL, with a sensitivity of 98.67%, a specificity of 95.00%, and a negative predictive value of 98.28% [8].