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American Journal of Pathology, Vol 118, 85-95, Copyright © 1985 by American Society for Investigative Pathology

REGULAR ARTICLES

Desmin is a specific marker for rhabdomyosarcomas of human and rat origin

M Altmannsberger, K Weber, R Droste and M Osborn

Putative human rhabdomyosarcoma (RMS) has been divided into two groups according to desmin content. Twenty-five tumors with histologic features consistent with but not necessarily sufficient to prove a diagnosis of RMS were desmin-positive. More than 95% of the tumor cells were desmin-positive, suggesting a muscle origin and supporting the diagnosis of RMS. Nine tumors for which the preferred first histologic diagnosis was also RMS were desmin-negative. Reexamination of the original histologic slides together with results from intermediate filament typing resulted in a diagnosis other than RMS for all tumors in this second group, and in several instances other tests were used to prove the correctness of the final diagnosis. The results on human material were extended to a rat model system in which RMS was induced by nickel sulfide. Again, all 24 tumors tested were desmin-positive. Vimentin was coexpressed in a varying percentage of tumor cells in RMS of human and rat origin. The results show that desmin is an excellent marker for rhabdomyosarcoma, yielding few if any false-positive or false-negative results in frozen or alcohol-fixed material.


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Copyright © 1985 by the American Society for Investigative Pathology.