title: DNA index and S-phase in primary brain tumors. A comparison between fresh and deparaffinized specimens studied by flow cytometry.
abstract: Forty-nine primary intracranial tumors (33 astrocytomas, eight acoustic schwannomas, five oligodendrogliomas, and three miscellaneous tumors) were studied by flow cytometry. Each tumor specimen was divided into two portions: one was studied as an unfixed suspension stained with propidium iodide and the other after formalin fixation and paraffin embedding. The 50-microns sections from the paraffin blocks were deparaffinized, rehydrated, and enzymatically disintegrated, and the cells in suspension were stained with propidium iodide. Flow cytometry of the two portions showed a significant correlation between fresh and fixed specimens regarding the S-phase (r = 0.87) and a very close correlation fo the deoxyribonucleic acid (DNA) index (r = 0.95). When the 33 astrocytomas were analyzed separately, similar results were obtained (r = 0.86 for S-phase and r = 0.93 for DNA index, respectively). This study demonstrated a high correlation between fresh and fixed specimens for DNA ploidy and S-phase both in primary intracranial tumors in general and also in the selected subgroup of astrocytomas.
authors.affiliation: Department of Neurosurgery, University Hospital, Linköping, Sweden.
authors.forename: L
authors.initials: L
authors.lastname: Vavruch
authors.forename: S
authors.initials: S
authors.lastname: Eneström
authors.forename: J
authors.initials: J
authors.lastname: Carstensen
authors.forename: B
authors.initials: B
authors.lastname: Nordenskjöld
authors.forename: S
authors.initials: S
authors.lastname: Wingren
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001254:Astrocytoma / Q000235:genetics; D001932:Brain Neoplasms / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D004273:DNA, Neoplasm / Q000032:analysis*; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000235:genetics; D009837:Oligodendroglioma / Q000235:genetics; D011003:Ploidies; D012189:Retrospective Studies; D016196:S Phase / Q000235:genetics*; D016707:Tissue Fixation
chemical_list: D004273:DNA, Neoplasm