In this study, we analyze risk factors for seroma evacuation more than 6 months after IORT.
We evaluated 120 patients with a mean follow-up of 27.8 months (range: 7–52 months). Fifty-one patients received IORT only and 69 were additionally treated with WBRT.
Seroma evacuation was performed 6–38 months after IORT. Two (3.9%) events were observed in the IORT group and 14 (20%) in the IORT + WBRT group. Univariate (Kaplan–Meier) analysis showed that addition of WBRT to IORT increased the risk of seroma evacuation [hazard ratio = 5.5, 95% confidence interval: 2.0–14.7, P = 0.011]. In a multivariate analysis (Cox proportional hazards regression), WBRT and axillary lymph node dissection were significant risk factors for seroma evacuation (model P value = 0.0025).
WBRT applied after IORT is associated with increased risk of seroma evacuation, which might be considered as a late side effect.
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