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Ioannis Zavrakidis
Researcher at Netherlands Cancer Institute
Publications - 4
Citations - 57
Ioannis Zavrakidis is an academic researcher from Netherlands Cancer Institute. The author has contributed to research in topics: GiST & Sample size determination. The author has an hindex of 3, co-authored 4 publications receiving 29 citations.
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Quality of treatment and surgical approach for rectal gastrointestinal stromal tumour (GIST) in a large European cohort
Nikki S. IJzerman,Nikki S. IJzerman,Mahmoud Mohammadi,D Tzanis,Hans Gelderblom,Marco Fiore,Elena Fumagalli,Piotr Rutkowski,Elżbieta Bylina,Ioannis Zavrakidis,Neeltje Steeghs,Han J. Bonenkamp,Boudewijn van Etten,Dirk J. Grünhagen,Shahnawaz Rasheed,Paris Tekkis,Charles Honoré,Winan J. van Houdt,Jos A. van der Hage,Sylvie Bonvalot,Yvonne Schrage,Myles Smith +21 more
TL;DR: In European clinical practice for rectal GIST, LTR, LAR and APR have comparable local control,Multimodal approach is higher and tumour rupture less frequent in specialist centres compared to general hospitals.
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Metabolic biomarker–based BRAFV600 mutation association and prediction in melanoma
Hanna Saadani,Bernies van der Hiel,Else A. Aalbersberg,Ioannis Zavrakidis,John B. A. G. Haanen,Otto S. Hoekstra,Ronald Boellaard,Marcel P. M. Stokkel +7 more
TL;DR: B-rapidly accelerated fibrosarcoma valine 600 mutation status is not associated with, nor can it be predicted with, conventional PET features, whereas radiomics features were of low predictive value, and feature selection methods to influence predictive model performance were shown.
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Statistical analysis of longitudinal data on tumour growth in mice experiments
TL;DR: A linear regression model with an autoregressive (AR-1) covariance structure is an adequate model to analyse experiments that compare tumour growth rates between treatment groups, and is recommended as the least complex method for small to moderate sample sizes encountered in animal experiments.
Journal ArticleDOI
Oncological Outcome After Diagnostic Biopsies in Gastrointestinal Stromal Tumors: A Retrospective Cohort Study.
Winan J. van Houdt,Nikki S. IJzerman,Nikki S. IJzerman,Anne Marjolein Schrijver,Eva A. Huis in ’t Veld,Khin Thway,Robin L. Jones,Nicos Fotiadis,Andrew J. Hayes,Annemarie Bruining,Ioannis Zavrakidis,Frits van Coevorden,Neeltje Steeghs,Ron H.J. Mathijssen,Dirk C. Strauss,Myles Smith +15 more
TL;DR: Transluminal or transcutaneous biopsies for diagnosing GIST do not significantly alter the risk of local recurrent disease or DSS in multivariate Cox regressions and therisk of needle tract seeding after trans cutaneous biopsy was low.