Abstract
Skeletal muscle differentiation within a Wilms' tumor is a well-documented histopathologic entity thought to occur at a relatively low incidence and influence prognosis. A serum-free hormonally defined growth medium has been developed, allowing the long-term growth of the skeletal muscle component of Wilms' tumors. Eight Wilms' tumors have been grown under these conditions. Three cases grew a homogeneous population of cells which ultrastructurally displayed all stages of myogenesis through myotubule formation. They also possessed immunoreactivity for skeletal muscle myosin and myoglobin and synthesized the M and B subunits of creatine kinase. Of interest was the finding that the ability to yield skeletal muscle cultures was limited to those cases which exhibited skeletal muscle fibers in vivo. This technique is also a very sensitive marker for identifying Wilms' tumors possessing a myoid component. A second serum-free hormonally defined medium has also been developed that supports the long-term culture of a unique cell type from Wilms' tumors which contain a myoid component. These cells are spindle-shaped and exhibit all of the characteristics of early myoblasts.
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