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Chargari C, Escande A, Dupuis P, Thariat J. Reirradiation: A complex situation. Cancer Radiother 2022; 26:911-915. [PMID: 35987812 DOI: 10.1016/j.canrad.2022.06.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 06/17/2022] [Indexed: 10/15/2022]
Abstract
Reirradiation of a tumor recurrence or second cancer in a previously irradiated area is challenging due to lack of high-quality physical, radiobiological, clinical data and inherent substantial risks of toxicity with cumulative dose and uncertain tissue recovery. Yet, major advances have been made in radiotherapy techniques, that have the potential to achieve cure while limiting severe toxicity rates, but still much research is necessary to better appraise the therapeutic index in such a complex situation.
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Affiliation(s)
- C Chargari
- Radiation Oncology, Gustave Roussy Cancer Campus, Villejuif, France.
| | - A Escande
- Département universitaire de radiothérapie, centre Oscar-Lambret, 3, rue Frédéric-Combemale, 59000 Lille, France; Faculté de médecine Henri-Warembourg, université de Lille, 59000 Lille, France; UMR 9189, Centre de recherche en informatique, signal et automatique de Lille (Cristal), 59655 Villeneuve d'Ascq, France
| | - P Dupuis
- Léon Bérard Cancer Center, University of Lyon, 69373 Lyon, France
| | - J Thariat
- Francois Baclesse Cancer center. Laboratoire de Physique Corpusculaire/IN2P3-CNRS UMR 6534-ARCHADE, Unicaen-Université de Normandie, 14000 Caen, France
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Kuntz L, Le Fèvre C, Jarnet D, Keller A, Meyer P, Cox DG, Bund C, Antoni D, Cebula H, Noel G. Radionecrosis after repeated courses of radiotherapy under stereotactic conditions for brain metastases: Analysis of clinical and dosimetric data from a retrospective cohort of 184 patients. Cancer Radiother 2022; 26:692-702. [PMID: 35715354 DOI: 10.1016/j.canrad.2022.01.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 12/27/2021] [Accepted: 01/05/2022] [Indexed: 10/18/2022]
Abstract
PURPOSE Between 10 and 40% of patients with cancer will develop one or more brain metastases (BMs). Stereotactic radiotherapy (SRT) is part of the therapeutic arsenal for the treatment of de novo or recurrent BM. Its main interest is to delay whole brain radiation therapy (WBRT), which may cause cognitive toxicity. However, SRT is not exempt from long-term toxicity, and the most widely known SRT is radionecrosis (RN). The objective of this study was to analyze the occurrence of RN per BM and per patient. MATERIAL AND METHODS Between 2010 and 2020, data from 184 patients treated for 915 BMs by two to six SRT sessions for local or distant brain recurrence without previous or intercurrent WBRT were retrospectively reviewed. RN was examined on trimestral follow-up MRI and potentially confirmed by surgery or nuclear medicine. For each BM and SRT session plan, summation V12Gy, V14Gy, V21Gy and V23Gy isodoses were collected. Volumes of intersections were created between the 12Gy isodose at the first SRT and the 18Gy isodose of the following SRT (V18-12Gy). RESULTS At the end of follow-up, 23.0% of patients presented RN, and 6.3% of BM presented RN. Median follow-up of BM was 13.3 months (95%CI 18.3-20.8). The median interval between BM irradiation and RN was 8.7 months (95% CI 9.2-14.7). Six-, 12- and 24-month RN-free survival rates per BM were 75%, 54% and 29%, respectively. The median RN-free survival per patient was 15.3 months (95% CI 13.6-18.1). In multivariate analysis, the occurrence of RN per BM was statistically associated with local reirradiation (P<0.001) and the number of SRTs (P<0.001). In univariate analysis, the occurrence of RN per patient was statistically associated with the sum of all V18-12Gy (P=0.02). No statistical association was found in multivariate analysis. A sum of all V18-12Gy of less than 1.5ml was associated with a 14.6% risk of RN, compared with 35.6% when the sum of all V18-12Gy was superior to 1.5ml. The sum of all V18-12Gy larger than 1.5ml was associated with a 74% specificity and 53% sensitivity of RN (P<0.001). CONCLUSION Based on these results, a small number of BMs show RN during repeated SRT for local or distant recurrent BMs. Local reirradiation was the most predictive factor of brain RN. A V18-12Gy larger than 7.6ml in the case of local reirradiation or larger than 1.5ml in proximity reirradiation were prognostic factors of RN. The more BM patients need radiation therapy, and the longer they survive after irradiation, the higher their individual risk of developing RN.
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Affiliation(s)
- L Kuntz
- Radiation Therapy University Department, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - C Le Fèvre
- Radiation Therapy University Department, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - D Jarnet
- Medical Physics Unit, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - A Keller
- Radiation Therapy University Department, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - P Meyer
- Medical Physics Unit, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - D G Cox
- IRFAC, Inserm U1113, 3, avenue Molière, 67000 Strasbourg, France; Research and Development in Precision Medicine, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - C Bund
- Biophysics and Nuclear Medicine, University Hospitals of Strasbourg, 1, avenue Molière, 67200 Strasbourg, France
| | - D Antoni
- Radiation Therapy University Department, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France
| | - H Cebula
- Department of Neurosurgery, University Hospitals of Strasbourg, 1, avenue Molière, 67200 Strasbourg, France
| | - G Noel
- Radiation Therapy University Department, Institut de Cancérologie Strasbourg Europe (ICANS), 17, rue Albert-Calmette, 67200 Strasbourg, France.
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