MMP13 and breast cancer: This study aimed to evaluate 1) the diagnostic value of circulating MMP1, MMP8 and MMP13 in breast cancer patients, 2) the prognostic value of plasma MMP1, MMP8 and MMP13 in breast cancer by correlating their levels with standard prognostic factors, 3) the diagnostic value of circulating MMP1, MMP8 and MMP13 in inflammatory breast cancer which is characterized by a particularly aggressive behaviour and poor prognosis [20].