The overall annual incidence of primary CTCL in the US in 1988 was 0-5-1-0 per 100 000 based on population data. However, the prevalence is much higher because most patients have low-grade disease and live long.2 Males (2-1) and the black population are affected more commonly.2,3 The incidence has increased during the past two decades but this almost certainly reflects improved diagnosis of earlier stages and possibly better registration, particularly in the US.3

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