Summary
Eleven benign giant cell tumors of bone were studied in the electron microscope, and the fine structural localization of acid phosphatase was elucidated. Three distinct cell types are always present in these tumors: stromal cells type 1; stromal cells type 2; and multinucleated giant cells. Small mononuclear cells may also occur, but are not likely to be actively participating in the neoplastic process.
The range of variability in the fine structure of the different cell types constituting this tumor has been established. Variations in appearances include: a) presence of nuclear pseudoinclusions in stromal cells type 1 and multinucleated giant cells; b) aberrations in the structure of the rough surfaced endoplasmic reticulum in the same cell types; c) occurrence of ruffled borders, ectoplasmic layers and cytoplasmic labyrinths containing acid phosphatase in the giant cells. Some giant cells show evidence of marked phagocytic activity and contain large and numerous residual bodies carrying acid phosphatase.
The significance of the interrelations between the different cell types are discussed and the possible role of stromal cells type 2 in immunological mechanisms directed against the tumor cells are mentioned.
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This investigation has been aided by a grant from the Swedish Cancer Society (grant 77:64, project No. 617-B77-06XA)
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Aparisi, T., Arborgh, B. & Ericsson, J.L.E. Giant cell tumor of bone. Virchows Arch. A Path. Anat. and Histol. 381, 159–178 (1979). https://doi.org/10.1007/BF01257881
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DOI: https://doi.org/10.1007/BF01257881