title: Solitary fibrous tumors and hemangiopericytomas of the meninges: overlapping pathological features and common prognostic factors suggest the same spectrum of tumors.
abstract: Meningeal solitary fibrous tumors (SFTs) and hemangiopericytomas (HPCs) are distinct entities in the World Health Organization (WHO) classification of central nervous system (CNS) tumors while they belong to the same spectrum of tumors in other locations. Well-defined histological prognostic factors are also lacking for these tumors. In order to clarify the relationship between SFT and HPC and to find histological and immunohistochemical prognostic factors, we carried out a retrospective study in 89 patients. The following histological parameters were recorded: hypercellularity, collagenic areas, cytonuclear atypias, necrosis, mitotic count per 10 high-power fields, vasculo-nervous adherences defined by engulfment of vessel or nerve by the tumor, brain infiltration. We found overlapping histological and immunohistochemical features between SFT and HPC. The most relevant histological prognostic factors in the whole cohort for both progression-free survival (PFS) and overall survival (OS) in univariate analysis were hypercellularity, high mitotic count (>5 per 10 high-power fields) and necrosis. On the basis of these results, we propose a new grading scheme for these tumors which was of pronostic value for both PFS and OS in uni- and multivariate analysis. As extent of surgery was also a prognostic factor for both PFS and OS in univariate analysis, we propose that management of SFT/HPC might be based both on quality of removal and histological grade.
authors.affiliation: Department of Pathology and Neuropathology, Timone Hospital, Marseille, France. corinne.bouvier@univmed.fr
authors.forename: Corinne
authors.initials: C
authors.lastname: Bouvier
authors.forename: Philippe
authors.initials: P
authors.lastname: Métellus
authors.forename: André Maues
authors.initials: AM
authors.lastname: de Paula
authors.forename: Alexandre
authors.initials: A
authors.lastname: Vasiljevic
authors.forename: Anne
authors.initials: A
authors.lastname: Jouvet
authors.forename: Jacques
authors.initials: J
authors.lastname: Guyotat
authors.forename: Karima
authors.initials: K
authors.lastname: Mokhtari
authors.forename: Pascale
authors.initials: P
authors.lastname: Varlet
authors.forename: Henry
authors.initials: H
authors.lastname: Dufour
authors.forename: Dominique
authors.initials: D
authors.lastname: Figarella-Branger
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008577:Meningeal Neoplasms / Q000401:mortality* / Q000473:pathology*; D008579:Meningioma / Q000401:mortality / Q000473:pathology*; D008875:Middle Aged; D011379:Prognosis; D054364:Solitary Fibrous Tumors / Q000401:mortality / Q000473:pathology*; D016019:Survival Analysis; D055815:Young Adult
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