The final classification consisted of (i) tumor areas (FOXL2+/COL1A1−, considered pure tumor) and (ii) collagen-rich areas, including FOXL2−/COL1A1+ stroma, FOXL2+/COL1A1+ stroma, and FOXL2+/COL1A1+ fibromatous tumor. The gene discussed is COL1A1; the disease is neoplasm.