Figure 2.

A. The tumour was mainly composed of abundant spindle cells. The tumour was absent of glands except that one elongated and narrow gland was displayed here after widely sectioned. (HE × 50) B. The tumour cells were gathered and abundant, whereas collagen was relatively rare. (HE × 100) C. Collagen bundles among the tumour cells were rather ample. (HE × 100) D. The tumour cells displayed inconspicuous eosinophilic or amphophilic cytoplasm, and striking and vesicular nuclei with coarse chromatin or obvious nucleoli. Mitoses were easily found. (HE × 400) E. CD10 was strongly and diffusely positive. (MaxVision method ×200) F. EGFR was strongly and diffusely positive. (MaxVision method × 200).