Koen Zwart

ORCID: 0000-0002-0369-4509
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About
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Research Areas
  • Colorectal Cancer Treatments and Studies
  • Genetic factors in colorectal cancer
  • Colorectal and Anal Carcinomas
  • Gastric Cancer Management and Outcomes
  • Lung Cancer Treatments and Mutations
  • Cancer Immunotherapy and Biomarkers
  • Cancer Genomics and Diagnostics
  • Hepatocellular Carcinoma Treatment and Prognosis
  • Atrial Fibrillation Management and Outcomes
  • Cardiac Valve Diseases and Treatments
  • Cancer Treatment and Pharmacology
  • Viral-associated cancers and disorders
  • Radiomics and Machine Learning in Medical Imaging
  • Infective Endocarditis Diagnosis and Management
  • Advanced Radiotherapy Techniques
  • Mycobacterium research and diagnosis
  • Cancer Diagnosis and Treatment
  • Metabolism, Diabetes, and Cancer
  • Cardiovascular and Diving-Related Complications
  • Enhanced Recovery After Surgery
  • Surgical site infection prevention
  • Stoma care and complications
  • Colorectal Cancer Surgical Treatments
  • Melanoma and MAPK Pathways
  • Pancreatic function and diabetes

Utrecht University
2023-2025

University Medical Center Utrecht
2016-2025

Meander Medisch Centrum
2021

Wilhelmina Children's Hospital
2018

Current knowledge on prognostic biomarkers (especially BRAFV600E /RAS mutations) in metastatic colorectal cancer (mCRC) is mainly based mCRC patients with proficient mismatch repair (pMMR) tumors. It uncertain whether these have the same value deficient (dMMR) This observational cohort study combined a population-based Dutch (2014-2019) and large French multicenter (2007-2017). All histologically proven dMMR tumor were included. In our real-world data of 707 patients, 438 treated first-line...

10.1002/cam4.6223 article EN cc-by Cancer Medicine 2023-06-16

Abstract The treatment landscape for metastatic colorectal cancer (mCRC) has evolved into a continuum of care with an essential role biomarkers and molecular subgroups. Treatment guidelines are primarily based on trial results; however, populations outcomes differ from clinical practice. To support the interpretation results to assist in tailored patient counseling, we evaluated real‐world patterns according RAS/BRAF status. We included all patients diagnosed BRAF V600E ‐mutated mCRC...

10.1002/ijc.35410 article EN cc-by-nc-nd International Journal of Cancer 2025-03-13

Background Immune checkpoint inhibitors (ICIs) are the gold standard therapy in patients with deficient mismatch repair (dMMR)/microsatellite instability-high (MSI-H) metastatic colorectal cancer (mCRC). A significant proportion of show resistance, making identification determinants response crucial. Growing evidence supports role sex determining susceptibility to anticancer therapies, but data is lacking for MSI-H CRC. Methods In this real-world cohort comprising 624 mCRC receiving ICIs, we...

10.1136/jitc-2024-010598 article EN cc-by-nc-nd Journal for ImmunoTherapy of Cancer 2025-02-01

130 Background: Maintenance treatment with capecitabine and bevacizumab after capecitabine, oxaliplatin, therapy in metastatic colorectal cancer (mCRC) is shown to be effective observation as an acceptable alternative. Metastatic burden might aid shared decision-making the aim of this exploratory analysis assess prognostic predictive value number total volume metastases mCRC patients included CAIRO3 study. Methods: Patients study liver and/or lung were included. Every individual metastasis...

10.1200/jco.2024.42.3_suppl.130 article EN Journal of Clinical Oncology 2024-01-20
Sietske C. van Nassau Marinde J. G. Bond Ilva Scheerman Jesper van Breeschoten Rob Kessels and 81 more Liselot B. Valkenburg-van Iersel Henk M.W. Verheul Tineke E. Buffart Leonie J. Mekenkamp V.E.P.P. Lemmens Miriam Koopman Guus M. Bol Mirte Mayke Streppel Leon van Hout Maartje Los Zonne L. M. Hofman Lonneke W. Kessels Erica H A Groen Lieke L H van Huis-Tanja Felix E. de Jongh Louise J. M. Alferink Hans‐Martin Otten Els J E Wink-van Gestel Ankie M.T. van der Velden Dirkje W. Sommeijer Sadaf Oliai Araghi Loes M Latten-Jansen Milou S Keusters Brigitte C.M. Haberkorn Arie J. Verschoor Carolien Haazer Geert‐Jan Creemers Nikki F T Henckens Frank Jeurissen Karin E M de Nijs Ronald Hoekstra Judith J Zwartjens Mathijs P. Hendriks Arthur D van Leeuwen Hester van Cruijssen P Werner Wendy E C J Heuts Peter Nieboer Natascha A. J. B. Peters Marly van Cranenbroek Theo van Voorthuizen Frederiek Terheggen Merel Pieters Mark P.S. Sie Lieke H. J. Simkens Julia G L Olislagers Miriam L. Wumkes Roel Janssen Leontine E.A.M.M. Spierings Esther van Staveren Iris Kats Allert H. Vos Josca J Heier Edwin A. van Breugel Jeroen Vincent Marjan A. Davidis Teunie Sepers Johan J. B. Janssen Berend B O Broeren Linda M. H. van de Winkel Sieneke A Hiddink Annemarie Conijn-Mensink Stefanie van Lunteren Annette A. van Zweeden Magda Vergouwe Brian M J Scholtes Serge E. Dohmen Marcia Ijzer Jaap de Boer Kees C J A Punt Geraldine R. Vink Patricia A. H. Hamers Karel C Smit Maarten A. Huismans Emerens G E Wensink Suzanna J. Schraa Karlijn L. van Rooijen Jeroen W. G. Derksen Anne M. May Koen Zwart Jeanine M J Roodhart

<h3>Importance</h3> Triplet chemotherapy with fluorouracil, folinic acid, oxaliplatin, and irinotecan plus bevacizumab (FOLFOXIRI-B) is an effective first-line treatment option for patients metastatic colorectal cancer (mCRC). However, the degree of implementation FOLFOXIRI-B in daily practice unknown. <h3>Objectives</h3> To evaluate current adoption rate mCRC investigate perspectives medical oncologists toward this option. <h3>Design, Setting, Participants</h3> This 1-week, multicenter,...

10.1001/jamanetworkopen.2021.24766 article EN cc-by-nc-nd JAMA Network Open 2021-09-10

3589 Background: Approximately 10-15% of patients with metastatic colorectal cancer (mCRC) have BRAF V600E mutated tumors. Encorafenib plus cetuximab (EC) combination treatment was approved following the results randomized phase III BEACON trial and is currently recommended for all pretreated -mutant mCRC. Selection in controlled trials based on restrictive eligibility criteria often not representative patient population daily clinical practice. Complementary real-world effectiveness studies...

10.1200/jco.2023.41.16_suppl.3589 article EN Journal of Clinical Oncology 2023-06-01

Mitral regurgitation (MR) grading by two-dimensional transthoracic echocardiography is challenging, but important to determine the best treatment strategy in patients with MR. Current guidelines advocate an integrative approach, although no recommendation provided on how do so. An easy-to-use index will be helpful for standardized and reproducible MR grading.Eleven echocardiographic parameters were retrospectively evaluated 145 moderate or severe Parameters scored positive negative MR, where...

10.1111/echo.13636 article EN Echocardiography 2017-08-22

Partial denervation of the wrist can benefit patients with chronic pain. A complication partial is loss proprioception and hypesthesia on dorsal side hand. Our aim to evaluate whether sensory branches posterior interosseous nerve could contribute sensation. The branching pattern was studied in 20 cadaveric hands. terminal reached metacarpophalangeal joints three specimens (15%), midshaft metacarpals carpometacarpal 11 (55%), scapholunate joint (15%). finding that reach indicates may...

10.1002/ca.23486 article EN Clinical Anatomy 2019-10-03

Abstract Sodium-glucose cotransporter 2 (SGLT2) inhibitors include a relatively new class of glucose-lowering drugs that reduce plasma glucose concentrations by inhibiting proximal tubular reabsorption in the kidney, while increasing its excretion urine. Recent large randomised controlled trials have demonstrated many these agents occurrence major adverse cardiovascular events, hospitalisation for heart failure, death and/or chronic kidney disease progression patients with and without type...

10.1007/s12471-021-01580-9 article EN Netherlands Heart Journal 2021-06-16

Cancer has become an important cause of death in solid organ transplant patients. The malignancies patients with transplants is multifactorial, but the use intensive immunosuppression regarded as factor. We describe spontaneous, complete regression colon cancer liver metastases, without initiation antitumor therapy, a patient after modulation immunosuppressants. Case Presentation. A 59-year-old female was admitted fever, general discomfort, and elevated enzymes. She had received single lung...

10.1155/2023/9643370 article EN cc-by Case Reports in Transplantation 2023-01-12

It is unclear whether curative-intent local therapy of metastases similar benefit for the biological distinct subgroup patients with deficient mismatch repair (dMMR) metastatic colorectal cancer (mCRC) compared proficient (pMMR) mCRC.In this nationwide study, recurrence-free (RFS) and overall survival (OS) were analyzed in dMMR versus pMMR mCRC who underwent treatment between 2015 2018. Subgroup analyses performed resection liver (CRLM) cytoreductive surgery ± hyperthermic intraperitoneal...

10.1245/s10434-023-13974-7 article EN cc-by Annals of Surgical Oncology 2023-08-01

65 Background: Data on clinical treatment outcomes of systemic non-immunotherapy in patients with MSI-H mCRC are limited due to low incidence. Real world data can support the interpretation immunotherapy studies. Our aim is provide insight treated non-immunotherapy. Methods: We describe an observational cohort study real-world from Netherlands Cancer Registry during 2015-2018 (N=383) and trial-based three prospective phase III first-line trials: CAIRO, CAIRO2 CAIRO3 (N=54). investigated...

10.1200/jco.2023.41.4_suppl.65 article EN Journal of Clinical Oncology 2023-01-24
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