PLoS ONE (Jan 2017)

Risk stratification for venous thromboembolism in patients with testicular germ cell tumors.

  • Angelika Bezan,
  • Florian Posch,
  • Ferdinand Ploner,
  • Thomas Bauernhofer,
  • Martin Pichler,
  • Joanna Szkandera,
  • Georg C Hutterer,
  • Karl Pummer,
  • Thomas Gary,
  • Hellmut Samonigg,
  • Joerg Beyer,
  • Thomas Winder,
  • Thomas Hermanns,
  • Christian D Fankhauser,
  • Armin Gerger,
  • Michael Stotz

DOI
https://doi.org/10.1371/journal.pone.0176283
Journal volume & issue
Vol. 12, no. 4
p. e0176283

Abstract

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BACKGROUND:Patients with testicular germ cell tumors (TGCT) have an increased risk for venous thromboembolism (VTE). We identified risk factors for VTE in this patient cohort and developed a clinical risk model. METHODS:In this retrospective cohort study at the Medical University of Graz we included 657 consecutive TGCT patients across all clinical stages. A predictive model for VTE was developed and externally validated in 349 TGCT patients treated at the University Hospital Zurich. RESULTS:Venous thromboembolic events occurred in 34 (5.2%) patients in the Graz cohort. In univariable competing risk analysis, higher clinical stage (cS) and a retroperitoneal lymphadenopathy (RPLN) were the strongest predictors of VTE (p<0.0001). As the presence of a RPLN with more than 5cm in greatest dimension without coexisting visceral metastases is classified as cS IIC, we constructed an empirical VTE risk model with the following four categories (12-month-cumulative incidence): cS IA-B 8/463 patients (1.7%), cS IS-IIB 5/86 patients (5.9%), cS IIC 3/21 patients (14.3%) and cS IIIA-C 15/70 patients (21.4%). This risk model was externally validated in the Zurich cohort (12-month-cumulative incidence): cS IA-B (0.5%), cS IS-IIB (6.0%), cS IIC (11.1%) and cS IIIA-C (19.1%). Our model had a significantly higher discriminatory performance than a previously published classifier (RPLN-VTE-risk-classifier) which is based on the size of RPLN alone (AUC-ROC: 0.75 vs. 0.63, p = 0.007). CONCLUSIONS:According to our risk stratification, TGCT patients with cS IIC and cS III disease have a very high risk of VTE and may benefit from primary thromboprophylaxis for the duration of chemotherapy.