Activity of thalidomide in AIDS-related Kaposi's sarcoma and correlation with HHV8 titre

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Abstract
A phase II study of thalidomide was conducted to evaluate its efficacy and toxicity in the treatment of cutaneous AIDS-related Kaposi's sarcoma (AIDSKS). To evaluate whether clinical response is correlated with titre of human herpesvirus 8 (HHV8) DNA in peripheral blood, levels were determined by serial end-point dilution at enrolment and 4-6 weeks later. Seventeen male HIVseropositive patients with histopathologically diagnosed KS were treated with thalidomide 100 mg orally once nightly for 8 weeks. Response evaluation was performed using AIDS Clinical Trials Group (ACTG) criteria and analysis was by intention to treat. Six of 17 patients achieved a partial response (35%: 95% confidence interval 10-61%). Eight patients withdrew (6 owing to toxicity, one to early progression and one to non-compliance). HHV8 DNA load decreased by at least 3log10 to undetectable levels in 3 of the 5 virologically assessable partial responders. This preliminary study demonstrates that thalidomide has activity in the treatment of AIDS-KS and that clinical response is associated with a reduction of HHV8 DNA titre in peripheral blood.

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