THE CORRELATION OF PERITUMORAL CLEFTS WITH MYOFIBROBLASTIC STROMAL REACTION IN INVASIVE DUCTAL BREAST CARCINOMA
Tanja Leniček, Marina Kos
Aim: To determine the correlation of peritumoral retraction clefts and myofibroblastic stromal reaction in invasive breast carcinomas of no special type. Methods: Peritumoral clefts were analyzed in 100 invasive ductal breast carcinomas. Stromal reaction was analyzed immunohistochemically with CD34, vimentin and smooth muscle actin (SMA). Results: Peritumoral clefts were found in 92% of invasive carcinoma tissue and were absent in surrounding normal tissue and around ducts of in situ component. The extent of peritumoral clefts ranged from 5% to 100% and correlated significantly with the quantity of SMA+ stromal myofibroblasts, increased tumor size, pT stage, presence of lymph node metastasis and the rate of positive lymph nodes. Extensive peritumoral clefts (in >30% of tumor tissue) correlated significantly with higher quantity of SMA+ myofibroblasts, higher frequency of lymph node metastases and higher rate of positive lymph nodes. Conclusion: Peritumoral retraction clefts are morphological expression of the phenotypic changes of tumor stromal cell that acquire myofibroblastic characteristics.