Eva C Rijkmans1, Corrie A M Marijnen2, Baukelien van Triest3, Martijn Ketelaars2, Annemieke Cats4, Akin Inderson5, Roy P J van den Ende2, Mirjam S Laman2, Ellen M Kerkhof2, Remi A Nout2. 1. Leiden University Medical Center LUM, Department of Radiation Oncology, the Netherlands. Electronic address: e.c.rijkmans@lumc.nl. 2. Leiden University Medical Center LUM, Department of Radiation Oncology, the Netherlands. 3. The Netherlands Cancer Institute, Department of Radiotherapy, Amsterdam, the Netherlands. 4. The Netherlands Cancer Institute, Department of Gastrointestinal Oncology, Amsterdam, the Netherlands. 5. Leiden University Medical Center LUMC, Department of Gastroenterology and Hepatology Leiden, the Netherlands.
Abstract
PURPOSE: The HERBERT study was a dose-finding feasibility study of a high-dose rate endorectal brachytherapy (HDREBT) boost after external beam radiotherapy (EBRT) in elderly patients with rectal cancer who were unfit for surgery. This analysis evaluates the association of patient, tumor and dosimetric parameters with tumor response and toxicity after HDREBT in definitive radiotherapy for rectal cancer. PATIENTS AND METHODS: The HERBERT study included 38 inoperable patients with T2-3N0-1 rectal cancer. Thirteen fractions of 3 Gy EBRT were followed by three weekly HDREBT applications of 5-8 Gy per fraction. Clinical and dosimetric parameters were tested for correlation with clinical complete response (cCR), sustained partial/complete response (SR), patient reported bowel symptoms, physician reported acute and late proctitis (CTCAE v3) and endoscopically scored toxicity. RESULTS: Thirty-five patients completed treatment and were included in the current analyses. Twenty of 33 evaluable patients achieved a cCR, the median duration of a sustained response was 32 months. Tumor volume at diagnosis showed a strong association with clinical complete response (OR 1.15; p = 0.005). No dose-response correlation was observed in this cohort. Prescribed dose to the brachytherapy CTV (D90) correlated with acute and late physician reported proctitis while CTV volume, CTV width and high dose regions in the CTV (D1cc/D2cc) were associated with endoscopic toxicity at the tumor site. CONCLUSION: Tumor volume is the most important predictive factor for tumor response and a higher dose to the brachytherapy CTV increases the risk of severe clinically and endoscopically observed proctitis after definitive radiotherapy in elderly patients with rectal cancer.
PURPOSE: The HERBERT study was a dose-finding feasibility study of a high-dose rate endorectal brachytherapy (HDREBT) boost after external beam radiotherapy (EBRT) in elderly patients with rectal cancer who were unfit for surgery. This analysis evaluates the association of patient, tumor and dosimetric parameters with tumor response and toxicity after HDREBT in definitive radiotherapy for rectal cancer. PATIENTS AND METHODS: The HERBERT study included 38 inoperable patients with T2-3N0-1 rectal cancer. Thirteen fractions of 3 Gy EBRT were followed by three weekly HDREBT applications of 5-8 Gy per fraction. Clinical and dosimetric parameters were tested for correlation with clinical complete response (cCR), sustained partial/complete response (SR), patient reported bowel symptoms, physician reported acute and late proctitis (CTCAE v3) and endoscopically scored toxicity. RESULTS: Thirty-five patients completed treatment and were included in the current analyses. Twenty of 33 evaluable patients achieved a cCR, the median duration of a sustained response was 32 months. Tumor volume at diagnosis showed a strong association with clinical complete response (OR 1.15; p = 0.005). No dose-response correlation was observed in this cohort. Prescribed dose to the brachytherapy CTV (D90) correlated with acute and late physician reported proctitis while CTV volume, CTV width and high dose regions in the CTV (D1cc/D2cc) were associated with endoscopic toxicity at the tumor site. CONCLUSION:Tumor volume is the most important predictive factor for tumor response and a higher dose to the brachytherapy CTV increases the risk of severe clinically and endoscopically observed proctitis after definitive radiotherapy in elderly patients with rectal cancer.
Authors: Antonio Caycedo-Marulanda; Sunil V Patel; Chris P Verschoor; Johanna P Uscategui; Sami A Chadi; Gabriela Moeslein; Manish Chand; Yasuko Maeda; John R T Monson; Steven D Wexner; Julio Mayol Journal: World J Surg Date: 2020-10-08 Impact factor: 3.352
Authors: Emmanouil Fokas; Ane Appelt; Alexandra Gilbert; David Sebag-Montefiore; Claus Rödel; Robert Glynne-Jones; Geerard Beets; Rodrigo Perez; Julio Garcia-Aguilar; Eric Rullier; J Joshua Smith; Corrie Marijnen; Femke P Peters; Maxine van der Valk; Regina Beets-Tan; Arthur S Myint; Jean-Pierre Gerard; Simon P Bach; Michael Ghadimi; Ralf D Hofheinz; Krzysztof Bujko; Cihan Gani; Karin Haustermans; Bruce D Minsky; Ethan Ludmir; Nicholas P West; Maria A Gambacorta; Vincenzo Valentini; Marc Buyse; Andrew G Renehan Journal: Nat Rev Clin Oncol Date: 2021-08-04 Impact factor: 66.675