Quantitative Changes in Pro-Oncogenic and Tumor-Suppressing MicroRNA in the Regional Lymph Node during Photodynamic Therapy of Experimental Breast Cancer.

We studied quantitative changes in microRNAs in the axillary lymph node (regional lymph node of the mammary gland) and in the breast tumor tissue. The quantity of pro-oncogenic microRNAs (miR-21 and miR-221) in the regional lymph node decreased in the group after photodynamic therapy of the breast cancer. At the same time, the quantity of pro-oncogenic miR-27a remained decreased in this group, as well as in the group with breast cancer without treatment. The quantity of tumor-suppressing miR-429 in the regional lymph node after photodynamic therapy of breast cancer remained at the same level with the quantity in the group of rats with breast cancer without treatment.