In enteropathy-associated T-cell lymphoma (types 1 and 2), primary cutaneous CD4 + small/medium T-cell lymphoma, peripheral T-cell lymphoma, NOS, and ALCL, ALK-negative, the error rates were 38.9, 75.0, 12.6, and 16.2%, respectively. This evidence concerns the gene ALK and T-cell non-Hodgkin lymphoma.