Immuno-phenotypic and Immuno-histochemistry analyses were positive for Cyclin D1 (Fig. 5), CD5 (Fig. 6), CD20 (Fig. 7) and BCL2 (Fig. 8), but negative for CD10, CD23 and BCL6, which confirms which confirmed the diagnosis of stage IV mantle cell lymphoma with intact bowel resection margins. This evidence concerns the gene CCND1 and mantle cell lymphoma.