Tumor cells with the plasmacytoid/signet ring-like morphology demonstrated strong expression of GATA-3 (Fig. 3a), pancytokeratin, CK7 (Fig. 3b) and CK20 (Fig. 3c), patchy expression of CD138, CK903, and p53, and focal expression of PAX-8. This evidence concerns the gene TP53 and neoplasm.