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Biomedical subjects

R Halder

Publications and source records attributed to R Halder.

3 recordsLinked to original sources

Melagenina. An analysis of published and other available data.

The placenta should be an excellent source of factors which might be efficacious in the treatment of vitiligo. Proof, however, for that hypothesis is lacking. Numerous claims have been made about Melagenina. It would appear to be nontoxic if we were to assume that the medication does not contain infectious agents. The ease of application certainly is of value for patients with vitiligo who wish to try some therapy for their disease. Practically, it is very costly to travel to Cuba and to export Melagenina. The cost of shipping on airplanes plus import duties make the price very high. Unfortunately, the inconvenience of the travel and the costs cannot necessarily be offset by the claims to efficacy. The biochemistry, assays for biological activity and the pharmacology studies as reported do not stand up to rigorous and acceptable scientific standards. The medication clearly needs further and intensive study. Now that the barriers between countries are being dismantled, it is hoped that the Cuban team will be able to travel to other laboratories outside of Cuba where they can continue animal studies as well as studies on melanocytes growing in culture. In addition, it is hoped that they will be able to share more about the pharmacology, the chemistry, the isolation and other chemical properties of the medication. These results can be published and will stand up to scrutiny by the world's medical and scientific community. Until that time, patients and their physicians must recognize the uncertain quality of the claims as well as the high financial cost and potential risk of using Melagenina either within or outside of Cuba.

Cuba

Alkaptonuria.

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Adult

Determination of optimal topical photochemotherapy for vitiligo.

The efficacy of topical 8-methoxypsoralen (8-MOP) in varying concentrations and vehicles was assessed in 73 vitiligo patients. The response rates in different anatomic sites were also assessed. Seven patients (9%) had 100% repigmentation; 26 (36%) had 50% or greater repigmentation, 29 (40%) had some degree of pigment return, but less than 50%; 11 (15%) had no repigmentation. Results suggest that neither concentration of drug nor vehicle is a crucial factor for inducing repigmentation of vitiliginous patches on the face, trunk, and extremities. Low-dose 8-MOP (0.1%) was as effective as high dose 8-MOP (0.5%, 1%), while causing fewer side effects. However, when treating recalcitrant areas (distal extremities), 1% 8-MOP may be the most efficacious preparation for topical photochemotherapy. A phototoxic response preceded repigmentation in all cases. The following responses were obtained for the various anatomic sites treated: 56% of facial lesions; 35% of trunk areas; 36% of the extremities, and 13% of the recalcitrant areas had greater than 50% repigmentation.

Administration, Topical