RT Journal Article T1 Evaluation of needle biopsy as a potential risk factor for local recurrence of Wilms tumour in the SIOP WT 2001 trial. A1 Irtan, Sabine A1 Van-Tinteren, Harm A1 Graf, Norbert A1 van-den-Heuvel-Eibrink, Marry M A1 Heij, Hugo A1 Bergeron, Christophe A1 de-Camargo, Beatriz A1 Acha, Tomas A1 Spreafico, Filippo A1 Vujanic, Gordan A1 Powis, Mark A1 Okoye, Bruce A1 Wilde, Jim A1 Godzinski, Jan A1 Pritchard-Jones, Kathy K1 Biopsy K1 Local relapse K1 SIOP WT 2001 K1 Wilms tumour AB The impact of biopsying Wilms tumour (WT) at diagnosis on assigning the tumour stage and recommended treatment remains controversial. To address this important question, we analysed the potential association of all types of biopsy with local recurrence in patients treated in the SIOP WT 2001 trial, where needle biopsy was permitted without 'upstaging' the tumour to stage III. Only open biopsy required treatment as stage III. Among 2971 patients with unilateral WT (stages I-IV), 420 relapsed (139 local). Risk factors for recurrence were analysed by Cox proportional hazard methods. Biopsy was performed in 969 of 2971 (33%) patients (64% cutting needle, 30% fine needle aspiration [FNA] and 6% open biopsy). Biopsied patients were older, with larger tumours and a greater proportion with high-risk histology. In multivariate analysis that included all factors associated with local recurrence in univariate analysis, only high-risk histology (hazard ratio [HR] = 2.32; 95% confidence interval [CI]: 1.58-3.42, p= This post hoc analysis provides some reassurance that needle biopsy is not an independent adverse factor for either local recurrence or survival after adjustment for all relevant risk factors. Needle biopsy should not be an automatic criterion to 'upstage' WT. PB Elsevier YR 2019 FD 2019-06-01 LK http://hdl.handle.net/10668/14075 UL http://hdl.handle.net/10668/14075 LA en NO Irtan S, Van Tinteren H, Graf N, van den Heuvel-Eibrink MM, Heij H, Bergeron C, et al. Evaluation of needle biopsy as a potential risk factor for local recurrence of Wilms tumour in the SIOP WT 2001 trial. Eur J Cancer. 2019 Jul;116:13-20 DS RISalud RD Sep 12, 2025