Fig. 1

The primary phyllodes tumor in the left breast had leaf-like architecture of epithelial cells and high-grade malignant stromal overgrowth (H&E, ×4 (a), magnificent). The tumor partially containing 1.0 × 0.9 cm SCC in the primary site: SCC partially have contact with epithelial cells of phyllodes tumor (H&E, ×4 (b), magnificent). AE1/3 was positive on SCC and negative on the phyllodes tumor (×10 (c), magnificent). H&E, hematoxylin and eosin; SCC, squamous cell carcinoma