ERBB2 and triple-negative breast carcinoma: However, there were no significant association between MMP1 expression and other clinicopathologic factors including age, tumor location, differential grade, lymph node infiltration, and HER2 and triple-negative breast cancer (TNBC) status (p = 0.377, 0.856, 0.394, 0.5, 0.861 and 0.188, respectively).