Extranodal NK/T-cell lymphoma, nasal type:a clinicopathological analysis of 28 cases / 临床与实验病理学杂志

ABSTRACT

Purpose To study the clinicopathologic features, diagnosis and differential diagnosis of extranodal NK/T-cell lymphoma, nasal type ( EN-NK/TCL) . Methods Twenty-eight cases of EN-NK/TCL were analyzed according to WHO classification of tumors of haematopoietic and lymphoid tissues, the cases were studied by microscopy, immunohistochemistry and in situ hybridization. Results In 28 cases, the male to female ratio was 1 ∶ 1. 2. The mean age was 46 years, with the median of 44. 5. Eighteen cases involved nasal cavity, 5 cases of skin, and 1 case of tonsil, upper palate, root of tongue, adrenal glands and gastric, respectively. The main presentation was nasal obstruction in cases with nasal involvement, and the cases with skin involvement present with rash, ulcer, plaque or nodular mass. Patients might be accompanied by B-type symptoms, lymphoadenopathy or with multiple sites involvement. The tumor cells were small, medium, large-sized, or mixed, and angiocentric and angiodestructive growth pattern was frequently pres-ent. Most cases were mixed with inflammatory cells infiltration. The typical immunophenotype was T-cell ( the most sensitive, CD3ε) , CD56 and cytotoxic markers. In situ hybridization for EBER was positive. Ten cases were followed up, and 1 case died. Conclusions The most common site of EN-NK/TCL is nasal cavity, followed by skin. EN-NK/TCL can be definitely diagnosed by integration of pathological morphology, immunophenotype and in situ hybridization of EBER.