title: Pelvic insufficiency fracture after definitive radiotherapy for uterine cervical cancer: retrospective analysis of risk factors.
abstract: The purpose of this study is to determine the incidence, clinical characteristics and risk factors of postradiation pelvic insufficiency fracture (PIF) in women with uterine cervical cancer. We reviewed the medical records of 126 patients who received definitive radiotherapy (RT) for uterine cervical cancer between 2003 and 2009 at our institution. Among them, 99 patients who underwent at least one computed tomography (CT) or magnetic resonance imaging of the pelvis during their follow-up at more than 6 months were included in this analysis. The relationship between the incidence of PIF and several patient- and treatment-related factors was analyzed. The median follow-up period was 21 months. Of the 126 patients, 33 (with a total of 50 lesions) were diagnosed with PIF. The 2-year cumulative incidence was 32%. Univariate analysis showed that age ≥70 years (P= 0.0010), postmenopausal state (P = 0.0013), and lower CT density of bone and bone marrow (P= 0.020) significantly related to PIF. In a multivariate analysis, of the 59 patients whose CT densities were evaluable, lower CT density was the only significant factor associated with PIF (P = 0.0026). In conclusion, postradiation PIFs were detected in a considerable number of patients after definitive RT for cervical cancer. Predisposing factors were older age, postmenopausal state, and decreased density of bone and bone marrow on CT.
authors.affiliation: Department of Radiation Oncology Hyogo Cancer Center, 13-70 Kitaoji-Cho, Akashi, Hyogo 673-8558, Japan.
authors.forename: Haruka
authors.initials: H
authors.lastname: Uezono
authors.forename: Kayoko
authors.initials: K
authors.lastname: Tsujino
authors.forename: Keno
authors.initials: K
authors.lastname: Moriki
authors.forename: Fumiko
authors.initials: F
authors.lastname: Nagano
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Ota
authors.forename: Ryohei
authors.initials: R
authors.lastname: Sasaki
authors.forename: Toshinori
authors.initials: T
authors.lastname: Soejima
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D015775:Fractures, Stress / Q000453:epidemiology* / Q000532:radiotherapy*; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000293:injuries* / Q000528:radiation effects; D017698:Postmenopause; D011832:Radiation Injuries / Q000453:epidemiology*; D020266:Radiotherapy, Conformal / Q000706:statistics & numerical data*; D012307:Risk Factors; D017678:Sex Distribution; D016896:Treatment Outcome
keywords: CT density; adverse event; pelvic insufficiency fracture; radiotherapy; uterine cervical cancer