Human T-cell lymphotropic virus type I and adult T-cell leukemia/lymphoma outside Japan and the Caribbean Basin.

Ninety-six patients with the diagnosis of adult T-cell leukemia/lymphoma (ATLL) were identified in countries outside Japan and the Caribbean Basin. Seventy-four of these patients were initially diagnosed in the United States; 25 of 52 patients whose places of birth were known had been born in the United States. The detection of 14 patients born in the southeastern United States, all black, indicates a group deserving particular attention for studies of human T-cell lymphotropic virus type I (HTLV-I), a suspected etiologic agent in most cases of ATLL. Although geographic clustering of ATLL in areas endemic for HTLV-I, particularly southwest Japan and the Caribbean Basin, is a dramatic feature of this disease, a review of the literature indicates that HTLV-I-associated ATLL probably occurs sporadically in a much wider distribution, the disease being diagnosed in native-born African, Chinese, European, and Latin American patients. A registry for ATLL cases is suggested, to assist in the identification of risk factors for this disease and, at the same time, improve case definitions and early diagnosis.

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