OPN1SW and breast cancer: At 14 days, representative images of picrosirius red staining showed similar predominance of red-orange birefringence in all experimental groups, corresponding to fine and disorganized collagen fibers with higher mean in the BC group (average 12.2%), but without significant difference in relation to the other BCP, BT, and BTP (means 10.5%, 9.14%, and 7.21%, respectively) (Figure 4A1,A2,C3).