Lymphatic and blood vessels in sections of invasive breast cancer stained for D2-40 and CD31. Lymphatic vessel invasion stained for CD31(A) and D2-40 (B) in sections of breast tumors from the same case. In A, CD31 positive endothelium and in B, D2-40 positive endothelium (×400). Blood vessel invasion stained for CD31 (C) and D2-40 (D) in sections of breast tumors from the same case. In C, CD31 positive endothelium and in D, D2-40 negative endothelium (×400). In B and C, the endothelium of lymphatic vessels without invasion was also immunostained.