Table 2.

Morphological Features of 60 ALK-Positive Lymphomas

Morphological appearance	Number ALK+/tested	Tumor cells; Pattern of ALK positivity
Common	45 /68	23/45; all c+ n*
		15/45; many c+ n,† few n‡
		7/45; all c*
Lymphohistiocytic	6 /6	6/6; few c+ n,† many n‡
Small cell	5 /5	5/5; few c+ n,† many n‡
Giant cell	2 /6	1/2; all c+ n*
		1/2; all c*
Hodgkin’s like	2 /15	1/2; all c+ n*
		1/2; many c+ n,† many n‡
Total	60 /100

c, cytoplasmic; n, nuclear.

*Only large anaplastic cells (no small tumor cells were observed in these cases).

^†Mostly large anaplastic cells.

^‡Mostly small tumor cells.