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Moser R, Pfeiffer S, Cala L, Klein E, Kiechle M, Behzadi ST, Fallenberg E, Combs SE, Weber W, Borm KJ. Detecting Metastatic Patterns of Oligometastatic Breast Cancer: A Comparative Analysis of 18F-FDG PET/CT and Conventional CT Imaging. J Nucl Med 2024; 65:845-850. [PMID: 38637138 DOI: 10.2967/jnumed.123.266925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 03/05/2024] [Indexed: 04/20/2024] Open
Abstract
Metastasis-directed therapy has the potential to improve progression-free and overall survival in oligometastatic disease (OMD). For breast cancer, however, randomized trials have failed so far to confirm this finding. Because the concept of metastasis-directed therapy in OMD is highly dependent on the accuracy of the imaging modality, we aimed to assess the impact of 18F-FDG PET/CT on the definition of OMD in breast cancer patients. Methods: Eighty patients with a total of 150 18F-FDG PET/CT images (between October 2006 and January 2022) were enrolled in this retrospective study at the Technical University of Munich. The inclusion criteria were OMD, defined as 1-5 distant metastases, at the time of 18F-FDG PET/CT. For the current study, we systemically compared the metastatic pattern on 18F-FDG PET/CT with conventional CT. Results: At the time of 18F-FDG PET/CT, 21.3% of patients (n = 32) had a first-time diagnosis of metastatic disease, 40.7% (n = 61) had a previous history of OMD, and 38% (n = 57) had a previous history of polymetastatic disease. In 45.3% of cases, the imaging modality (18F-FDG PET/CT vs. conventional CT) had an impact on the assessment of whether OMD was present. An identical metastatic pattern was observed in only 32% of cases.18F-FDG PET/CT detected additional metastases in 33.3% of cases, mostly in the nonregional lymph node system. Conclusion: The use of 18F-FDG PET/CT had a substantial impact on the definition of OMD and detection of metastatic pattern in breast cancer. Our results emphasize the importance of establishing a standardized definition for imaging modalities in future trials and clinical practices related to metastasis-directed therapy in breast cancer patients.
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Affiliation(s)
- Rebecca Moser
- Department of Radiation Oncology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany
| | - Sophie Pfeiffer
- Department of Radiation Oncology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany
| | - Lisena Cala
- Department of Nuclear Medicine, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany
| | - Evelyn Klein
- Department of Obstetrics and Gynecology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich
| | - Marion Kiechle
- Department of Obstetrics and Gynecology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich
| | - Sophie T Behzadi
- Department of Radiation Oncology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany
| | - Eva Fallenberg
- Department of Obstetrics and Gynecology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich
| | - Stephanie E Combs
- Department of Radiation Oncology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany
- Department of Radiation Sciences, Germany Institute of Innovative Radiotherapy, Helmholtz Zentrum München, Oberschleißheim, Germany; and
- German Consortium for Translational Cancer Research, Munich, Germany
| | - Wolfgang Weber
- Department of Nuclear Medicine, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany
| | - Kai J Borm
- Department of Radiation Oncology, Klinikum Rechts der Isar, TUM School of Medicine and Health, Technical University Munich, Munich, Germany;
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Miller ED, Hitchcock KE, Romesser PB. Oligometastatic Colorectal Cancer: A Review of Definitions and Patient Selection for Local Therapies. J Gastrointest Cancer 2023; 54:1116-1127. [PMID: 36652155 PMCID: PMC10352468 DOI: 10.1007/s12029-022-00900-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/15/2022] [Indexed: 01/19/2023]
Abstract
PURPOSE Nearly one-third of patients diagnosed with colorectal cancer (CRC) will ultimately develop metastatic disease. While a small percentage of patients can be considered for curative resection, more patients have limited disease that can be considered for local therapy. Challenges remain in defining oligometastatic CRC as well as developing treatment strategies guided by high level evidence. METHODS In this review, we present the challenges in defining oligometastatic CRC and summarize the current literature on treatment and outcomes of local therapy in patients with metastatic CRC. RESULTS For patients with liver- and/or lung-confined CRC metastases, surgical resection is the standard of care given the potential for long-term progression-free and overall survival. For patients with liver- or lung-confined disease not amenable to surgical resection, non-surgical local therapies, such as thermal ablation, hepatic arterial infusion pump (HAIP), or stereotactic body radiation therapy (SBRT), should be considered. For patients with more advanced disease, such as lymph node or bony metastases, the role of metastasis-directed therapy is controversial. Emerging data suggests that SBRT to ablate all metastases can improve progression-free and overall survival. CONCLUSION Multidisciplinary management is critical for patients with metastatic CRC due to the complexity of their cases and the nuanced patient, tumor, biological, and anatomical factors that must be weighed when considering local therapy. High-quality prospective randomized data in CRC are needed to further clarify the role of local ablative therapy in patients with unresectable oligometastatic CRC with ongoing studies including the RESOLUTE trial (ACTRN12621001198819) and the upcoming NCTN ERASur trial (NCT05673148).
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Affiliation(s)
- Eric D Miller
- Department of Radiation Oncology, Ohio State University Comprehensive Cancer Center, 460 W. 10Th Ave., Room A209, Columbus, OH, 43210, USA.
| | - Kathryn E Hitchcock
- Department of Radiation Oncology, University of Florida Health, Gainesville, FL, USA
| | - Paul B Romesser
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
- Early Drug Development Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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3
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Izmailov T, Ryzhkin S, Borshchev G, Boichuk S. Oligometastatic Disease (OMD): The Classification and Practical Review of Prospective Trials. Cancers (Basel) 2023; 15:5234. [PMID: 37958408 PMCID: PMC10648904 DOI: 10.3390/cancers15215234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/15/2023] [Accepted: 10/26/2023] [Indexed: 11/15/2023] Open
Abstract
Oligometastatic disease (OMD) is currently known as an intermediate state of cancer, characterized by a limited number of systemic metastatic lesions for which local ablative therapy could be curative. Indeed, data from multiple clinical trials have illustrated an increase in overall survival (OS) for cancer patients when local ablative therapy was included in the systemic adjuvant therapy. Given that no driver and somatic mutations specific to OMD are currently established, the diagnosis of OMD is mainly based on the results of X-ray studies. In 2020, 20 international experts from the European Society for Radiotherapy and Oncology (ESTRO) and the European Organization for Research and Treatment of Cancer (EORTC) developed a comprehensive system for the characterization and classification of OMD. They identified 17 OMD characteristics that needed to be assessed in all patients who underwent radical local treatment. These characteristics reflect the tumor biology and clinical features of the disease underlying the development of OMD independently of the primary tumor type and the number of metastatic lesions. In particular, the system involves the characteristics of the primary tumor (e.g., localization, histology, TNM stage, mutational status, specific tumor markers), clinical parameters (e.g., disease-free interval, treatment-free interval), therapies (e.g., local, radical or palliative treatment, the numbers of the therapeutic regimens), and type of OMD (e.g., invasive). Based on the aforementioned criteria, an algorithm was introduced into the clinic to classify OMDs collectively according to their nomenclature. A history of polymetastatic disease (PMD) prior to OMD is used as a criterion to delineate between induced OMD (previous history of PMD after successful therapy) and genuine OMD (no history of PMD). Genuine OMD is divided into two states: recurrent OMD (i.e., after a previous history of OMD) and de novo OMD (i.e., a first newly diagnosed oligometastatic disease). de novo OMD is differentiated into synchronous and metachronous forms depending on the length of time from the primary diagnosis to the first evidence of OMD. In the case of synchronous OMD, this period is less than 6 months. Lastly, metachronous and induced OMD are divided into oligorecurrence, oligoprogression, and oligopersistence, depending on whether OMD is firstly diagnosed during an absence (oligo recurrence) or presence (oligoprogression or oligopersistence) of active systemic therapy. This classification and nomenclature of OMD are evaluated prospectively in the OligoCare study. In this article, we present a practical review of the current concept of OMD and discuss the available prospective clinical trials and potential future directions.
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Affiliation(s)
- Timur Izmailov
- Pirogov National Medical and Surgical Center, Ministry of Health of Russia, Moscow 127994, Russia; (T.I.); (G.B.)
- Department of Radiotherapy and Radiology, Russian Medical Academy of Continuous Professional Education, Moscow 127051, Russia;
| | - Sergey Ryzhkin
- Department of Radiotherapy and Radiology, Russian Medical Academy of Continuous Professional Education, Moscow 127051, Russia;
- Department of Hygiene, Kazan State Medical University, Kazan 420012, Russia
| | - Gleb Borshchev
- Pirogov National Medical and Surgical Center, Ministry of Health of Russia, Moscow 127994, Russia; (T.I.); (G.B.)
| | - Sergei Boichuk
- Department of Radiotherapy and Radiology, Russian Medical Academy of Continuous Professional Education, Moscow 127051, Russia;
- Department of Pathology, Kazan State Medical University, Kazan 420012, Russia
- “Biomarker” Research Laboratory, Institute of Fundamental Medicine and Biology, Kazan Federal University, Kazan 420008, Russia
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4
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Pasquier D, Bidaut L, Oprea-Lager DE, deSouza NM, Krug D, Collette L, Kunz W, Belkacemi Y, Bau MG, Caramella C, De Geus-Oei LF, De Caluwé A, Deroose C, Gheysens O, Herrmann K, Kindts I, Kontos M, Kümmel S, Linderholm B, Lopci E, Meattini I, Smeets A, Kaidar-Person O, Poortmans P, Tsoutsou P, Hajjaji N, Russell N, Senkus E, Talbot JN, Umutlu L, Vandecaveye V, Verhoeff JJC, van Oordt WMVDH, Zacho HD, Cardoso F, Fournier L, Van Duijnhoven F, Lecouvet FE. Designing clinical trials based on modern imaging and metastasis-directed treatments in patients with oligometastatic breast cancer: a consensus recommendation from the EORTC Imaging and Breast Cancer Groups. Lancet Oncol 2023; 24:e331-e343. [PMID: 37541279 DOI: 10.1016/s1470-2045(23)00286-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 06/06/2023] [Accepted: 06/09/2023] [Indexed: 08/06/2023]
Abstract
Breast cancer remains the most common cause of cancer death among women. Despite its considerable histological and molecular heterogeneity, those characteristics are not distinguished in most definitions of oligometastatic disease and clinical trials of oligometastatic breast cancer. After an exhaustive review of the literature covering all aspects of oligometastatic breast cancer, 35 experts from the European Organisation for Research and Treatment of Cancer Imaging and Breast Cancer Groups elaborated a Delphi questionnaire aimed at offering consensus recommendations, including oligometastatic breast cancer definition, optimal diagnostic pathways, and clinical trials required to evaluate the effect of diagnostic imaging strategies and metastasis-directed therapies. The main recommendations are the introduction of modern imaging methods in metastatic screening for an earlier diagnosis of oligometastatic breast cancer and the development of prospective trials also considering the histological and molecular complexity of breast cancer. Strategies for the randomisation of imaging methods and therapeutic approaches in different subsets of patients are also addressed.
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Affiliation(s)
- David Pasquier
- Academic Department of Radiation Oncology, Centre Oscar Lambret, Lille, France; University of Lille and CNRS, Centrale Lille, UMR 9189-CRIStAL, Lille, France.
| | - Luc Bidaut
- College of Science, University of Lincoln, Lincoln, UK
| | - Daniela Elena Oprea-Lager
- Department of Radiology and Nuclear Medicine, Amsterdam University Medical Centers, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Nandita M deSouza
- The Institute of Cancer Research, London, UK; The Royal Marsden NHS Foundation Trust, Sutton, UK
| | - David Krug
- Department of Radiation Oncology, Universitaetsklinikum Schleswig-Holstein-Campus Kiel, Kiel, Germany
| | - Laurence Collette
- Former European Organisation for Research and Treatment of Cancer (EORTC), Brussels, Belgium
| | - Wolfgang Kunz
- Department of Radiology, University Hospital, LMU Munich, Munich, Germany
| | - Yazid Belkacemi
- AP-HP, Radiation Oncology Department, Henri Mondor University Hospital, Créteil, France; INSERM Unit 955 (-Bio), IMRB, University of Paris-Est (UPEC), Créteil, France
| | - Maria Grazia Bau
- Azienda Ospedaliera Città della Salute e della Scienza di Torino, Ospedale Sant'Anna, Turin, Italy
| | - Caroline Caramella
- Hôpital Marie Lannelongue, Groupe Hospitalier Paris Saint-Joseph, Paris, France
| | - Lioe-Fee De Geus-Oei
- Department of Radiology, Leiden University Medical Center, Leiden, Netherlands; Biomedical Photonic Imaging Group, University of Twente, Enschede, Netherlands; Department of Radiation Science and Technology, Delft University of Technology, Delft, Netherlands
| | - Alex De Caluwé
- Radiotherapy Department, Institut Jules Bordet, Université Libre de Bruxelles, Brussels, Belgium
| | | | - Olivier Gheysens
- Department of Nuclear Medicine, Institut de Recherche Expérimentale et Clinique (IREC), Cliniques Universitaires Saint-Luc, Institut du Cancer Roi Albert II, UCLouvain, Brussels, Belgium
| | - Ken Herrmann
- Department of Nuclear Medicine, University of Duisburg-Essen, Essen, Germany; German Cancer Consortium (DKTK), University Hospital Essen, Essen, Germany
| | - Isabelle Kindts
- Department of Radiation Oncology, Cancer Centre, General Hospital Groeninge, Kortrijk, Belgium
| | - Michalis Kontos
- National and Kapodistrian University of Athens, Athens, Greece
| | - Sherko Kümmel
- Breast Unit, Kliniken Essen-Mitte, Essen, Germany; Charité - Universitätsmedizin Berlin, Department of Gynecology with Breast Center, Berlin, Germany
| | - Barbro Linderholm
- Department of Oncolgy, Sahlgrenska University Hospital, Gothenburg, Sweden; Institution of Clinical Sciences, Department of Oncology, Sahlgrenska Academy at Gothenburg University, Gothenburg , Sweden
| | | | - Icro Meattini
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence, Italy; Radiation Oncology Unit, Oncology Department, Azienda Ospedaliero Universitaria Careggi, Florence, Italy
| | - Ann Smeets
- Department of Surgical Oncology, University Hospitals Leuven, KU Leuven, Leuven, Belgium
| | - Orit Kaidar-Person
- Oncology Institute, Sheba Tel Hashomer, Ramat Gan, Israel; Tel-Aviv University, Tel-Aviv, Israel
| | - Philip Poortmans
- Department of Radiation Oncology, Iridium Netwerk, Antwerp, Belgium; University of Antwerp, Antwerp, Belgium
| | - Pelagia Tsoutsou
- Hôpitaux Universitaires de Genève, Site de Cluse-Roseraie, Geneva, Switzerland
| | - Nawale Hajjaji
- Medical Oncology Department, Centre Oscar Lambret, Lille, France; Laboratoire Protéomique, Réponse Inflammatoire, et Spectrométrie De Masse (PRISM), Inserm U1192, Lille, France
| | - Nicola Russell
- Department of Radiotherapy, The Netherlands Cancer Institute-Antoni Van Leeuwenhoekziekenhuis, Amsterdam, Netherlands
| | | | - Jean-Noël Talbot
- Institut National des Sciences et Techniques Nucléaires, CEA-Saclay, Paris, France
| | - Lale Umutlu
- Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany
| | | | - Joost J C Verhoeff
- Department of Radiotherapy, University Medical Center Utrecht, Utrecht, Netherlands
| | | | - Helle D Zacho
- Department of Nuclear Medicine, Aalborg University Hospital, Aalborg, Denmark
| | - Fatima Cardoso
- Breast Unit, Champalimaud Clinical Centre, Champalimaud Foundation, Lisbon, Portugal
| | - Laure Fournier
- Université Paris Descartes Sorbonne Paris Cité, Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Paris, France
| | - Frederieke Van Duijnhoven
- Department of Surgical Oncology, The Netherlands Cancer Institute-Antoni Van Leeuwenhoekziekenhuis, Amsterdam, Netherlands
| | - Frédéric E Lecouvet
- Department of Radiology, Institut de Recherche Expérimentale et Clinique (IREC), Cliniques Universitaires Saint-Luc, Institut du Cancer Roi Albert II, UCLouvain, Brussels, Belgium
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Miglietta F, Visani L, Marini S, Griguolo G, Vernaci GM, Bottosso M, Dieci MV, Meattini I, Guarneri V. Oligometastatic breast cancer: Dissecting the clinical and biological uniqueness of this emerging entity. Can we pursue curability? Cancer Treat Rev 2022; 110:102462. [PMID: 36087503 DOI: 10.1016/j.ctrv.2022.102462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 11/25/2022]
Abstract
Metastatic breast cancer represents an incurable condition, however, the increasing interest towards the oligometastatic entity is now challenging this assumption. Up to 20% of patients with metastatic breast cancer present with oligometastatic disease, which refers to metastatic breast cancer presenting or recurring with limited metastatic burden. In the last years, progressive advancements in imaging techniques, the growing availability of minimally invasive locoregional treatments, alongside the increasing expectations from a patient perspective, have contributed to rising the awareness towards this emerging entity. In the present work we comprehensively reviewed available evidence regarding oligometastatic breast cancer, focusing on clinical and biological notions virtually supporting the adoption of a curative approach when treating this condition. We also discussed main areas of uncertainties, providing a research agenda that may guide and fine-tune the future investigation in this field.
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Affiliation(s)
- Federica Miglietta
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Luca Visani
- Radiation Oncology Unit, Oncology Department, Azienda Ospedaliero Universitaria Careggi, Florence, Italy
| | - Sabrina Marini
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Gaia Griguolo
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Grazia Maria Vernaci
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Michele Bottosso
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Maria Vittoria Dieci
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy
| | - Icro Meattini
- Radiation Oncology Unit, Oncology Department, Azienda Ospedaliero Universitaria Careggi, Florence, Italy; Department of Experimental and Clinical Biomedical Sciences "M. Serio", University of Florence, Florence, Italy
| | - Valentina Guarneri
- Department of Surgery, Oncology and Gastroenterology, University of Padova, Padova, Italy; Division of Oncology 2, Istituto Oncologico Veneto IRCCS, Padova, Italy.
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6
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De Rose F, Meduri B, Carmen De Santis M, Ferro A, Marino L, Ray Colciago R, Gregucci F, Vanoni V, Apolone G, Di Cosimo S, Delaloge S, Cortes J, Curigliano G. Rethinking breast cancer follow-up based on individual risk and recurrence management. Cancer Treat Rev 2022; 109:102434. [DOI: 10.1016/j.ctrv.2022.102434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/27/2022] [Accepted: 06/28/2022] [Indexed: 12/01/2022]
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7
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Integrated 18F-FDG PET/CT parameter defines metabolic oligometastatic non-small cell lung cancer. Nucl Med Commun 2022; 43:1026-1033. [DOI: 10.1097/mnm.0000000000001599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Kahán Z, Szántó I, Dudás R, Kapitány Z, Molnár M, Koncz Z, Mailáth M. Breast Cancer Survivorship Programme: Follow-Up, Rehabilitation, Psychosocial Oncology Care. 1st Central-Eastern European Professional Consensus Statement on Breast Cancer. Pathol Oncol Res 2022; 28:1610391. [PMID: 35721327 PMCID: PMC9200958 DOI: 10.3389/pore.2022.1610391] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 04/29/2022] [Indexed: 02/04/2023]
Abstract
Follow-up includes ongoing contact with and health education of the patient, surveillance and control of the adverse effects of surgery, oncological therapies or radiotherapy, screening of metachronous cancers, and comprehensive (physical, psychological and social) patient rehabilitation, which may be enhanced by a healthy lifestyle. Primary attention should be paid to early detection and, when needed, curative treatment of local/regional tumour recurrences. Similarly, with the hope of curative solution, it is important to recognize the entity of a low-mass and relatively indolent recurrence or metastasis (oligometastasis); however, there is still no need to investigate distant metastases by routine diagnostic imaging or assess tumour markers. Below there is a list of possible sources of support, with respect to adjuvant hormone therapy continued during long-term care, social support resources, pivotal points and professional opportunities for physical and mental rehabilitation. Individual solutions for specific issues (breast cancer risk/genetic mutation, pregnancy) are provided by constantly widening options. Ideally, a complex breast cancer survivorship programme is practised by a specially trained expert supported by a cooperative team of oncologists, surgeons, breast radiologists, social workers, physiotherapists, psycho-oncologists and psychiatrists. The approach of follow-up should be comprehensive and holistic.
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Affiliation(s)
- Zsuzsanna Kahán
- Department of Oncotherapy, University of Szeged, Szeged, Hungary
| | - István Szántó
- St. George's General Teaching Hospital, Székesfehérvár, Hungary
| | - Rita Dudás
- Department of Oncotherapy, University of Szeged, Szeged, Hungary
| | | | - Mária Molnár
- Oncoradiology Centre, Bács-Kiskun County Hospital, Kecskemét, Hungary
| | - Zsuzsa Koncz
- Institute of Behavioural Sciences, Semmelweis University, Budapest, Hungary
| | - Mónika Mailáth
- Institute of Oncology, University of Debrecen, Debrecen, Hungary
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9
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Abdel-Aty H, James ND. The role of radiotherapy in oligometastatic hormone-sensitive prostate cancer. Curr Opin Urol 2022; 32:277-282. [PMID: 35249966 DOI: 10.1097/mou.0000000000000980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW The aim of this article is to review the role of radiotherapy in the management of oligometastatic hormone-sensitive prostate cancer (HSPC). RECENT FINDINGS The M1|RT STAMPEDE trial showed a survival advantage to prostate radiotherapy in newly diagnosed oligometastatic HSPC. The combination of prostate radiotherapy with systemic treatment is now the recommended standard of care. Metastases-directed therapy (MDT) with stereotactic ablative radiotherapy (SABR) in the STOMP and ORIOLE trial reported excellent local control and a survival advantage in metachronous oligometastatic HSPC. Results were consistent with prostate cancer outcomes in the SABR-COMET trial and the NHS England Commissioning through Evaluation scheme (CtE). SABR in synchronous oligometastatic HSPC will be evaluated in a new comparison within the STAMPEDE trial. Current definition of oligometastatic HSPC is based on the number of metastatic lesions on conventional imaging (CT/MRI and Isotope bone scan). Novel imaging, such as PSMA PET/CT provide superior accuracy to conventional imaging. However, limited data exists on the role of novel imaging in determining subsequent clinical outcomes. SUMMARY Prostate radiotherapy improves survival and is standard of care with systemic treatment in newly diagnosed oligometastatic HSPC. The role of SABR in newly diagnosed oligometastatic HSPC is yet to be determined.
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Affiliation(s)
- Hoda Abdel-Aty
- Division of Radiotherapy and Imaging, The Institute of Cancer Research
- Department of Radiotherapy, The Royal Marsden NHS Foundation Trust, London, UK
| | - Nicholas D James
- Division of Radiotherapy and Imaging, The Institute of Cancer Research
- Department of Radiotherapy, The Royal Marsden NHS Foundation Trust, London, UK
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10
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Imaging of Oligometastatic Disease. Cancers (Basel) 2022; 14:cancers14061427. [PMID: 35326586 PMCID: PMC8946296 DOI: 10.3390/cancers14061427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/03/2022] [Accepted: 03/08/2022] [Indexed: 11/22/2022] Open
Abstract
Simple Summary The imaging of oligometastatic disease (OMD) is challenging as it requires precise loco-regional staging and whole-body assessment. The combination of imaging modalities is often required. The more accurate imaging tool will be selected according to tumor type, the timing with regard to measurement and treatment, metastatic location, and the patient’s individual risk for metastasis. The most commonly used modalities are contrast-enhanced computed tomography (CT), magnetic resonance imaging and metabolic and receptor-specific imaging, particularly, 18F-fluorodesoxyglucose positron emission tomography/CT, used alone or in combination. Abstract Oligometastatic disease (OMD) is an emerging state of disease with limited metastatic tumor burden. It should be distinguished from polymetastatic disease due the potential curative therapeutic options of OMD. Imaging plays a pivotal role in the diagnosis and follow-up of patients with OMD. The imaging tools needed in the case of OMD will differ according to different parameters, which include primary tumor type, timing between measurement and treatment, potential metastatic location and the patient’s individual risk for metastasis. In this article, OMD is defined and the use of different imaging modalities in several oncologic situations are described in order to better understand OMD and its specific implication for radiologists.
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11
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Hu X, Li H, Kang X, Wang X, Pang H, Liu C, Zhang J, Wang Y. Efficacy and Safety of Local Radiotherapy to All Oligometastatic Sites in Elderly Patients with Metachronous Oligometastatic Cancers After Initial Treatment for the Primary Tumor. Cancer Manag Res 2021; 13:9247-9259. [PMID: 34955655 PMCID: PMC8694577 DOI: 10.2147/cmar.s345871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/06/2021] [Indexed: 12/04/2022] Open
Abstract
Background and Purpose This study aimed to investigate the efficacy and safety of maintenance therapy combined with local radiotherapy at all oligometastatic sites (LRTOS) in elderly patients with metachronous oligometastatic cancers (MOC). Patients and Methods A total of 242 elderly patients with MOC (≤5 metastases) and primary tumor well controlled after definitive treatment was retrospectively analyzed between August 2014 and February 2020 at Beijing Geriatric Hospital and Air Force General Hospital. Patients were divided into maintenance therapy group (maintenance therapy alone) and local radiotherapy group (maintenance therapy combined with LRTOS). Results There were 86 patients in the local radiotherapy group and 156 patients in the maintenance therapy group. The median length of follow-up was 36 months (range, 8.0–62 months). Median overall survival (mOS) was 25 months (95% CI: 21.1–28.9) in the local radiotherapy group and 16 months (95% CI: 14.5–17.6) in the maintenance therapy group (p < 0.001). Multivariate analyses demonstrated that LRTOS (hazard ratio (HR) = 0.49, 95% confidence interval (CI): 0.35–0.67, p < 0.001), good Eastern Cooperative Oncology Group Performance Status (ECOG PS, HR = 0.69, 95% CI: 0.49–0.97, p = 0.032), longer duration between diagnosis of primary tumor and occurrence of progression (HR = 0.87, 95% CI: 0.78–0.97, p = 0.015), and subsequent systemic treatment (HR = 0.52, 95% CI: 0.38–0.72, p < 0.001) were independent predictors of good OS. In patients who did not receive subsequent systemic treatment, their mOS was 21 months (95% CI: 12.8–29.2) for those treated with LRTOS and 14 months (95% CI: 11.4–16.6) for those who did not receive local radiotherapy (p = 0.001). Further multivariate analysis showed that LRTOS was the only independent factor for predicting good OS (HR = 0.47, 95% CI: 0.26–0.83, p = 0.010). Patients with metachronous oligometastatic lung cancer, colorectal cancer, prostate cancer, and breast cancer had higher survival benefits following LRTOS. Most patients suffered from grade 1–2 toxicities, but no treatment-related death was recorded. Conclusion This retrospective study shows that elderly patients with MOC treated with LRTOS may have better survival outcomes.
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Affiliation(s)
- Xiaolong Hu
- Department of Radiation Oncology, Beijing Geriatric Hospital, Beijing, People's Republic of China
| | - Hongqi Li
- Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China
| | - Xiaoli Kang
- Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China
| | - Xuan Wang
- Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China
| | - Haifeng Pang
- Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China
| | - Chen Liu
- Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China
| | - Jianchun Zhang
- Department of Radiation Oncology, Beijing Geriatric Hospital, Beijing, People's Republic of China
| | - Yingjie Wang
- Department of Radiation Oncology, Air Force General Hospital, Beijing, People's Republic of China
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12
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Lacaze JL, Aziza R, Chira C, De Maio E, Izar F, Jouve E, Massabeau C, Pradines A, Selmes G, Ung M, Zerdoud S, Dalenc F. Diagnosis, biology and epidemiology of oligometastatic breast cancer. Breast 2021; 59:144-156. [PMID: 34252822 PMCID: PMC8441842 DOI: 10.1016/j.breast.2021.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 05/31/2021] [Accepted: 06/23/2021] [Indexed: 11/01/2022] Open
Abstract
Does oligometastatic breast cancer (OMBC) deserve a dedicated treatment? Although some authors recommend multidisciplinary management of OMBC with a curative intent, there is no evidence proving this strategy beneficial in the absence of a randomized trial. The existing literature sheds little light on OMBC. Incidence is unknown; data available are either obsolete or biased; there is no consensus on the definition of OMBC and metastatic sites, nor on necessary imaging techniques. However, certain proposals merit consideration. Knowledge of eventual specific OMBC biological characteristics is limited to circulating tumor cell (CTC) counts. Given the data available for other cancers, studies on microRNAs (miRNAs), circulating tumor DNA (ctDNA) and genomic alterations should be developed Finally, safe and effective therapies do exist, but results of randomized trials will not be available for many years. Prospective observational cohort studies need to be implemented.
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Affiliation(s)
- Jean-Louis Lacaze
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département d'Oncologie Médicale, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France.
| | - Richard Aziza
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département d'Imagerie Médicale, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Ciprian Chira
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département de Radiothérapie, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Eleonora De Maio
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département d'Oncologie Médicale, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Françoise Izar
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département de Radiothérapie, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Eva Jouve
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département de Chirurgie, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Carole Massabeau
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département de Radiothérapie, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Anne Pradines
- Institut Claudius Regaud (ICR), Département Biologie Médicale Oncologique, Centre de Recherche en Cancérologie de Toulouse, (CRCT), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), INSERM UMR-1037, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Gabrielle Selmes
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département de Chirurgie, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Mony Ung
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département d'Oncologie Médicale, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Slimane Zerdoud
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département de Médecine Nucléaire, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
| | - Florence Dalenc
- Institut Claudius Regaud (ICR), Institut Universitaire du Cancer de Toulouse-Oncopole (IUCT-O), Département d'Oncologie Médicale, Université de Toulouse, UPS, 1 av. Irène Joliot Curie, 31059, Toulouse Cedex 9, France
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13
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Mat Lazim N, Elliott M, Wykes J, Clark J. Oligometastases in head and neck carcinoma and their impact on management. ANZ J Surg 2021; 91:2617-2623. [PMID: 33634950 DOI: 10.1111/ans.16622] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 01/12/2021] [Accepted: 01/14/2021] [Indexed: 12/14/2022]
Abstract
Historically, patients with head and neck squamous cell carcinoma (HNSCC) with distant metastases were regarded as palliative. Oligometastasis (OM) refers to patients with a limited number of distant metastatic deposits. Treatment of patients with OMs has been reported in patients with lung, colon, breast, prostate and brain malignancies. Selected patients with oligometastatic HNSCC have a higher probability of durable disease control and cure and these patients should be treated aggressively. Treatment options for patients with HNSCC OMs include single or combinations of the three arms of cancer treatment, that is surgery, radiotherapy and chemotherapy/immunotherapy. To date, there are limited studies reporting the management of OM with head and neck malignancy. This review will give insights into the management of OMs in HNSCC.
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Affiliation(s)
- Norhafiza Mat Lazim
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, Malaysia
| | - Michael Elliott
- Department of Head and Neck Surgery, Chris O'Brien Lifehouse, Sydney, New South Wales, Australia.,School of Medicine, The University of Sydney, Sydney, New South Wales, Australia
| | - James Wykes
- Department of Head and Neck Surgery, Chris O'Brien Lifehouse, Sydney, New South Wales, Australia
| | - Jonathan Clark
- Department of Head and Neck Surgery, Chris O'Brien Lifehouse, Sydney, New South Wales, Australia
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14
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Corradini S, Niyazi M, Verellen D, Valentini V, Walsh S, Grosu AL, Lauber K, Giaccia A, Unger K, Debus J, Pieters BR, Guckenberger M, Senan S, Budach W, Rad R, Mayerle J, Belka C. X-change symposium: status and future of modern radiation oncology-from technology to biology. Radiat Oncol 2021; 16:27. [PMID: 33541387 PMCID: PMC7863262 DOI: 10.1186/s13014-021-01758-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 01/28/2021] [Indexed: 02/06/2023] Open
Abstract
Future radiation oncology encompasses a broad spectrum of topics ranging from modern clinical trial design to treatment and imaging technology and biology. In more detail, the application of hybrid MRI devices in modern image-guided radiotherapy; the emerging field of radiomics; the role of molecular imaging using positron emission tomography and its integration into clinical routine; radiation biology with its future perspectives, the role of molecular signatures in prognostic modelling; as well as special treatment modalities such as brachytherapy or proton beam therapy are areas of rapid development. More clinically, radiation oncology will certainly find an important role in the management of oligometastasis. The treatment spectrum will also be widened by the rational integration of modern systemic targeted or immune therapies into multimodal treatment strategies. All these developments will require a concise rethinking of clinical trial design. This article reviews the current status and the potential developments in the field of radiation oncology as discussed by a panel of European and international experts sharing their vision during the "X-Change" symposium, held in July 2019 in Munich (Germany).
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Affiliation(s)
- Stefanie Corradini
- Department of Radiation Oncology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany.
| | - Maximilian Niyazi
- Department of Radiation Oncology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Dirk Verellen
- Department of Radiotherapy, Iridium Network, Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Vincenzo Valentini
- Department of Radiation Oncology and Hematology, Fondazione Policlinico Universitario A.Gemelli IRCCS, Università Cattolica S. Cuore, Rome, Italy
| | | | - Anca-L Grosu
- Department of Radiation Oncology, Medical Center, Medical Faculty, University of Freiburg, Freiburg, Germany
- German Cancer Consortium (DKTK), Partner Site Freiburg, Freiburg, Germany
| | - Kirsten Lauber
- Department of Radiation Oncology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
| | - Amato Giaccia
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University, Stanford, USA
| | - Kristian Unger
- Integrative Biology Group, Helmholtz Zentrum Munich, Munich, Germany
| | - Jürgen Debus
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
| | - Bradley R Pieters
- Department of Radiation Oncology, Amsterdam University Medical Centers, Location Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Matthias Guckenberger
- Department of Radiation Oncology, University Hospital of Zurich, University of Zurich, Zurich, Switzerland
| | - Suresh Senan
- Department of Radiation Oncology, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Wilfried Budach
- Department of Radiation Oncology, Medical Faculty, Heinrich Heine University, Düsseldorf, Germany
| | - Roland Rad
- Center for Translational Cancer Research (TranslaTUM), TU Munich, Munich, Germany
| | - Julia Mayerle
- Department of Internal Medicine II, University Hospital, LMU, Munich, Germany
| | - Claus Belka
- Department of Radiation Oncology, University Hospital, LMU Munich, Marchioninistr. 15, 81377, Munich, Germany
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15
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Boon IS, Au Yong TP, Boon CS. Cancer oligometastases heterogeneity: Standardizing nomenclature. In regard to defining oligometastatic disease from a radiation oncology perspective: An ESTRO-ASTRO consensus document. Radiother Oncol 2020; 149:247-248. [DOI: 10.1016/j.radonc.2020.06.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 06/22/2020] [Indexed: 11/28/2022]
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16
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Guckenberger M, Lievens Y, Bouma AB, Collette L, Dekker A, deSouza NM, Dingemans AMC, Fournier B, Hurkmans C, Lecouvet FE, Meattini I, Méndez Romero A, Ricardi U, Russell NS, Schanne DH, Scorsetti M, Tombal B, Verellen D, Verfaillie C, Ost P. Characterisation and classification of oligometastatic disease: a European Society for Radiotherapy and Oncology and European Organisation for Research and Treatment of Cancer consensus recommendation. Lancet Oncol 2020; 21:e18-e28. [PMID: 31908301 DOI: 10.1016/s1470-2045(19)30718-1] [Citation(s) in RCA: 518] [Impact Index Per Article: 129.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 10/14/2019] [Accepted: 10/15/2019] [Indexed: 02/06/2023]
Abstract
Oligometastatic disease has been proposed as an intermediate state between localised and systemically metastasised disease. In the absence of randomised phase 3 trials, early clinical studies show improved survival when radical local therapy is added to standard systemic therapy for oligometastatic disease. However, since no biomarker for the identification of patients with true oligometastatic disease is clinically available, the diagnosis of oligometastatic disease is based solely on imaging findings. A small number of metastases on imaging could represent different clinical scenarios, which are associated with different prognoses and might require different treatment strategies. 20 international experts including 19 members of the European Society for Radiotherapy and Oncology and European Organisation for Research and Treatment of Cancer OligoCare project developed a comprehensive system for characterisation and classification of oligometastatic disease. We first did a systematic review of the literature to identify inclusion and exclusion criteria of prospective interventional oligometastatic disease clinical trials. Next, we used a Delphi consensus process to select a total of 17 oligometastatic disease characterisation factors that should be assessed in all patients treated with radical local therapy for oligometastatic disease, both within and outside of clinical trials. Using a second round of the Delphi method, we established a decision tree for oligometastatic disease classification together with a nomenclature. We agreed oligometastatic disease as the overall umbrella term. A history of polymetastatic disease before diagnosis of oligometastatic disease was used as the criterion to differentiate between induced oligometastatic disease (previous history of polymetastatic disease) and genuine oligometastatic disease (no history of polymetastatic disease). We further subclassified genuine oligometastatic disease into repeat oligometastatic disease (previous history of oligometastatic disease) and de-novo oligometastatic disease (first time diagnosis of oligometastatic disease). In de-novo oligometastatic disease, we differentiated between synchronous and metachronous oligometastatic disease. We did a final subclassification into oligorecurrence, oligoprogression, and oligopersistence, considering whether oligometastatic disease is diagnosed during a treatment-free interval or during active systemic therapy and whether or not an oligometastatic lesion is progressing on current imaging. This oligometastatic disease classification and nomenclature needs to be prospectively evaluated by the OligoCare study.
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Affiliation(s)
- Matthias Guckenberger
- Department of Radiation Oncology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.
| | - Yolande Lievens
- Department for Radiation Oncology, Ghent University Hospital and Ghent University, Ghent, Belgium
| | - Angelique B Bouma
- European Organisation for Research and Treatment of Cancer Headquarters, Brussels, Belgium
| | - Laurence Collette
- European Organisation for Research and Treatment of Cancer Headquarters, Brussels, Belgium
| | - Andre Dekker
- Department of Radiation Oncology, School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, Netherlands
| | - Nandita M deSouza
- Division of Radiotherapy and Imaging, Institute of Cancer Research, Royal Marsden Hospital, London, UK
| | - Anne-Marie C Dingemans
- Department of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, Netherlands; Department of Respiratory Medicine, Erasmus Medical Center, Rotterdam, Netherlands
| | - Beatrice Fournier
- European Organisation for Research and Treatment of Cancer Headquarters, Brussels, Belgium
| | - Coen Hurkmans
- Department of Radiotherapy, Catharina Ziekenhuis, Eindhoven, Netherlands
| | - Frédéric E Lecouvet
- Radiology Department, Institut de Recherche Expérimentale et Clinique Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Icro Meattini
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, Florence, Italy; Radiation Oncology Unit, Azienda Ospedaliero-Universitaria Careggi, Florence, Italy
| | - Alejandra Méndez Romero
- Department of Radiation Oncology, Erasmus Medical Center, University Medical Center, Rotterdam, Netherlands
| | | | - Nicola S Russell
- Division of Radiotherapy, Netherlands Cancer Institute, Amsterdam, Netherlands
| | - Daniel H Schanne
- Department of Radiation Oncology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Marta Scorsetti
- Radiotherapy and Radiosurgery Department, Humanitas Clinical and Research Hospital, Istituto di Ricovero e Cura a Carattere Scientifico, Milan, Italy
| | - Bertrand Tombal
- Department of Urology, Cliniques Universitaires Saint Luc, Université Catholique de Louvain, Louvain-la-Neuve, Brussels, Belgium
| | - Dirk Verellen
- Iridium Kankernetwerk and University of Antwerp, Faculty of Medicine and Health Sciences, Antwerp, Belgium
| | | | - Piet Ost
- Department for Radiation Oncology, Ghent University Hospital and Ghent University, Ghent, Belgium
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