Establishment and Characterization of Two Human Mixed Mesodermal Tumor Cell Lines From the Same Patient

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Abstract
A cell line designated HIRS-BM was established from fluid aspirated from the sternal bone marrow of a 16-year-old female. Another cell line (HIRS-PB) was derived from the peripheral blood of the same patient. Both lines grew well, multilayering rapidly without contact inhibition, and 62 serial passages were successively done within 28 months. Both cultures contained spindle- or fibrous-shaped cells that revealed neo-plastic and pleomorphic features, and these cells were characterized as possessing cross-striations in the cytoplasm. The cross-striations were detected by phosphotungstic acid hematoxylin stain. Some elongated cells were stained positively with anti-myoglobin by use of periodic acid-Schiff methods. The primary tumor in the uterus was diagnosed as a mixed mesodermal tumor composed of adenocarcinoma and rhabdomyosarcoma cells. The karyotype exhibited hyperploidy and large submetacentric marker chromosomes, and the modal chromosome number was 84. No difference was found between the 2 cell lines except for growth behavior and heterotransplantability. HIRS-BM cells grew more rapidly and were highly transplantable. The HIRS-BM cells were transplanted into the subcutis of BALB/c nude mice and produced mixed mesodermal tumors resembling the uterine tumor, while the HIRS-PB cells could not be transplanted. Due to the histo-genesis of the mixed mesodermal tumor being's obscure with histologic observations only, this study was performed to obtain data by tissue culture of the tumor and resulted in support of the combination theory reported in the literature in regard to tumor.

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