title: Tumor cell proliferation and apoptosis associated with the Gamma Knife effect.
abstract: In this study, the expression of proliferating-cell nuclear antigen (PCNA) and Bcl-2 protein was examined in neurinomas, meningiomas, pituitary adenomas, and malignant lymphomas before treatment with Gamma Knife radiosurgery. Tumor volume was rapidly reduced by radiosurgery in all malignant lymphomas and in some benign tumors. The latter had been characterized by strong positive immunohistochemical staining for PCNA and Bcl-2. Radiation-induced apoptosis is thought to contribute to the low-dose effects of Gamma Knife radiosurgery. A population with a large proportion of proliferating cells may be susceptible to the induction of apoptosis, and the presence of Bcl-2 may not suppress this Gamma Knife effect.
authors.affiliation: Department of Neurosurgery, Nara Medical University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Tsuzuki
authors.forename: S
authors.initials: S
authors.lastname: Tsunoda
authors.forename: T
authors.initials: T
authors.lastname: Sakaki
authors.forename: N
authors.initials: N
authors.lastname: Konishi
authors.forename: Y
authors.initials: Y
authors.lastname: Hiasa
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: E
authors.initials: E
authors.lastname: Yoshino
mesh_terms: D017209:Apoptosis / Q000528:radiation effects*; D001932:Brain Neoplasms / Q000737:chemistry / Q000276:immunology / Q000473:pathology / Q000601:surgery*; D002455:Cell Division / Q000528:radiation effects; D006801:Humans; D008223:Lymphoma / Q000737:chemistry / Q000276:immunology / Q000473:pathology / Q000601:surgery; D009363:Neoplasm Proteins / Q000032:analysis*; D009419:Nerve Tissue Proteins / Q000032:analysis*; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000032:analysis; D016634:Radiosurgery / Q000009:adverse effects*
chemical_list: D009363:Neoplasm Proteins; D009419:Nerve Tissue Proteins; D018809:Proliferating Cell Nuclear Antigen; D019253:Proto-Oncogene Proteins c-bcl-2