title: Mechanism of tumor growth and metastasis; an alternate hypothesis.
abstract: The author proposes that malignant tumors increase in size not only by cell division, but also by transforming neighboring normal cells into malignant ones. Further, tumor metastasis may occur by humoral mechanisms, in addition to, physical migration of malignant cells.
mesh_terms: D002455:Cell Division; D002471:Cell Transformation, Neoplastic; D009362:Neoplasm Metastasis; D009369:Neoplasms / Q000473:pathology*