Abstract
It was believed for a long time, in both experimental and clinical fields that every cancer had its own malignancy and progressed into a more malignant state after a certain period. In other words, the cancer phenotype was stable and if it changed, it progressed only towards a more malignant state. Cancerization was thought to be irreversible. Ten years ago, Yoshida et al. [43] concluded that an irreversible change in a benign direction can very rarely occur in tumor cells. In viral carcinogenesis in vitro, Macpherson [25] demonstrated a revertant colony derived from cloned transformed cells. Braun [4] discussed the reversal of tumor growth from the viewpoint of gene regulation. Recently, Sugimura [40] also stressed a certain phenotypic change of a tumor as “decarcinogenesis” in his enzymic study of tumors. In the clinical field, as Everson and Cole [6] noted, spontaneous regression of human cancer definitely occurs.
This study was partly supported by a Grant-in-Aid from the Ministry of Education, and the Ministry of Health and Welfare, Government of Japan.
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We thank Mr. T. Nashiro for his skilful assistance in electron microscopy.
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Sugano, H., Furusawa, M., Kawaguchi, T., Ikawa, Y. (1973). Differentiation of Tumor Cells. In: Grundmann, E. (eds) Special Topics in Carcinogenesis. Recent Results in Cancer Research, vol 44. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-80786-2_6
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