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Zhang J, Gao J, Jiang S, Mao J, Chu L, Chu X, Yang X, Li Y, Guo T, Zhou Y, Xu D, Hu J, Chu Q, Ni J, Zhu Z. Oligo-residual disease in PD-1/PD-L1 inhibitor-treated metastatic non-small cell lung cancer: incidence, pattern of failure, and clinical value of local consolidative therapy. Cancer Immunol Immunother 2024; 73:140. [PMID: 38833011 DOI: 10.1007/s00262-024-03720-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Accepted: 05/02/2024] [Indexed: 06/06/2024]
Abstract
OBJECTIVES To investigate the feasibility and potential clinical value of local consolidative therapy (LCT) in PD-1/PD-L1 inhibitor-treated metastatic non-small cell lung cancer (NSCLC). MATERIALS AND METHODS PD-1/PD-L1 inhibitor-treated metastatic NSCLC patients with measurable disease in three academic centers were screened and those with adequate follow-up were included. Oligo-residual disease (ORD) was defined as residual tumors limited to three organs and five lesions evaluated at the best response among patients with partial response or stable disease after PD-1/PD-L1 inhibitors. Oligometastatic and multiple-metastatic disease (OMD/MMD) were similarly classified at baseline. Locoregional interventions, administered after effective treatment of PD-1/PD-L1 inhibitors and before initial disease progression, were defined as LCT. Patterns of initial progressive disease (PD) were classified as involving only residual sites (RP), only new sites (NP), or a combination of both (BP). RESULTS Among the 698 patients included, ORD was documented in 73 (47.1%) of 155 patients with baseline OMD and 60 (11.0%) of 543 patients with baseline MMD. With a median follow-up of 31.0 (range, 6.0-53.0) months, 108 patients with ORD developed initial PD, with RP, NP, and BP occurring in 51 (47%), 23 (21.3%), and 34 (31.5%), respectively. Among the 133 patients with ORD, those receiving LCT (n = 43) had longer progression-free survival (HR = 0.58, 95% CI 0.40-0.85, p = 0.01) and overall survival (HR = 0.49, 95% CI 0.30-0.79, p < 0.0001). CONCLUSION ORD occurs with a clinically relevant frequency among PD-1/PD-L1 inhibitor-treated metastatic NSCLC patients and LCT may provide extra survival benefits in those with ORD.
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Affiliation(s)
- Jinmeng Zhang
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Jie Gao
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Shanshan Jiang
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Jiuang Mao
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Li Chu
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Xiao Chu
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Xi Yang
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Yida Li
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Tiantian Guo
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Yue Zhou
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Dayu Xu
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China
| | - Jie Hu
- Department of Pulmonary Medicine, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Qian Chu
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jianjiao Ni
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China.
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China.
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China.
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China.
| | - Zhengfei Zhu
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Shanghai, 200032, China.
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, 200032, China.
- Shanghai Clinical Research Center for Radiation Oncology, Shanghai, China.
- Shanghai Key Laboratory of Radiation Oncology, Shanghai, 200032, China.
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Friedes C, Iocolano M, Lee SH, Li B, Duan L, Levin WP, Cengel KA, Sun LL, Aggarwal C, Marmarelis ME, Doucette A, Cohen RB, Xiao Y, Langer CJ, Bradley J, Feigenberg SJ, Yegya-Raman N. Patterns of Failure, Low-Volume Relapse, and Subsequent Ablative Management in Locally Advanced Non-Small Cell Lung Cancer Treated With Definitive Chemoradiation and Consolidation Immune Checkpoint Inhibitors. Int J Radiat Oncol Biol Phys 2024; 118:1435-1444. [PMID: 37866762 DOI: 10.1016/j.ijrobp.2023.10.005] [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: 06/19/2023] [Revised: 09/23/2023] [Accepted: 10/04/2023] [Indexed: 10/24/2023]
Abstract
PURPOSE The objective of this study was to describe the patterns of failure, frequency of low-volume relapse (LVR), and candidacy for ablative therapy at time of disease progression (PD) after chemoradiation and consolidative immunotherapy (CRT + ICI) in patients with stage III non-small cell lung cancer. METHODS AND MATERIALS We identified 229 consecutive patients with stage III non-small cell lung cancer treated with CRT + ICI between October 2017 and December 2021 at a single institution. PD was classified as isolated locoregional failure (LRF), isolated distant failure (DF), or synchronous LRF + DF. Any LRF was subclassified as in-field failure, marginal failure, or out-of-field failure. LVR was defined as 3 or fewer sites of PD in any number of organs. Ablative candidates were defined as having 5 or fewer sites of PD radiographically amenable to high-dose radiation or surgery. Time-to-event data were calculated using cumulative incidence analysis and Kaplan-Meier methods. Multivariable Cox modeling was used to examine the correlations between characteristics of relapse and postprogression survival. RESULTS Of the 229 patients, 119 (52%) had PD. Of these 119 patients, 20 (21%) had isolated LRF, 28 (24%) had synchronous LRF + DF, and 71 (60%) had isolated DF. Of the 48 patients with any LRF, 28 (58%) had in-field failure, 10 (21%) marginal failure, and 10 (21%) out-of-field failure. The cumulative incidence of LRF and DF was 13% (95% CI, 9.2%-18%) and 32% (95% CI, 26%-38%) at 1 year and 19% (95% CI, 14%-24%) and 39% (95% CI, 33%-46%) at 2 years, respectively. Overall, 64 patients (54%) were considered to have LVR. At time of PD, 60 patients (50%) were eligible for ablative therapy. Patients with LVR had longer median survival versus with high-volume relapse (37.4 vs 15.2 months, P < .001). On multivariable analysis, LVR (hazard ratio, 0.32; 95% CI, 0.18-0.56; P < .001) was associated with improved postprogression survival. CONCLUSIONS After CRT + ICI, approximately half of patients experience LVR at time of PD and are candidates for ablative therapies. Prospective trials are needed to validate the optimal treatment strategy for LVR.
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Affiliation(s)
- Cole Friedes
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
| | - Michelle Iocolano
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Sang Ho Lee
- Division of Physics, Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Bolin Li
- Division of Physics, Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Lian Duan
- Division of Physics, Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - William P Levin
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Keith A Cengel
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Lova L Sun
- Department of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Charu Aggarwal
- Department of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Melina E Marmarelis
- Department of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Abigail Doucette
- Department of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Roger B Cohen
- Department of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Ying Xiao
- Division of Physics, Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Corey J Langer
- Department of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Jeffrey Bradley
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Steven J Feigenberg
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
| | - Nikhil Yegya-Raman
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
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Tsai CJ, Yang JT, Shaverdian N, Patel J, Shepherd AF, Eng J, Guttmann D, Yeh R, Gelblum DY, Namakydoust A, Preeshagul I, Modi S, Seidman A, Traina T, Drullinsky P, Flynn J, Zhang Z, Rimner A, Gillespie EF, Gomez DR, Lee NY, Berger M, Robson ME, Reis-Filho JS, Riaz N, Rudin CM, Powell SN. Standard-of-care systemic therapy with or without stereotactic body radiotherapy in patients with oligoprogressive breast cancer or non-small-cell lung cancer (Consolidative Use of Radiotherapy to Block [CURB] oligoprogression): an open-label, randomised, controlled, phase 2 study. Lancet 2024; 403:171-182. [PMID: 38104577 PMCID: PMC10880046 DOI: 10.1016/s0140-6736(23)01857-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/27/2023] [Accepted: 08/31/2023] [Indexed: 12/19/2023]
Abstract
BACKGROUND Most patients with metastatic cancer eventually develop resistance to systemic therapy, with some having limited disease progression (ie, oligoprogression). We aimed to assess whether stereotactic body radiotherapy (SBRT) targeting oligoprogressive sites could improve patient outcomes. METHODS We did a phase 2, open-label, randomised controlled trial of SBRT in patients with oligoprogressive metastatic breast cancer or non-small-cell lung cancer (NSCLC) after having received at least first-line systemic therapy, with oligoprogression defined as five or less progressive lesions on PET-CT or CT. Patients aged 18 years or older were enrolled from a tertiary cancer centre in New York, NY, USA, and six affiliated regional centres in the states of New York and New Jersey, with a 1:1 randomisation between standard of care (standard-of-care group) and SBRT plus standard of care (SBRT group). Randomisation was done with a computer-based algorithm with stratification by number of progressive sites of metastasis, receptor or driver genetic alteration status, primary site, and type of systemic therapy previously received. Patients and investigators were not masked to treatment allocation. The primary endpoint was progression-free survival, measured up to 12 months. We did a prespecified subgroup analysis of the primary endpoint by disease site. All analyses were done in the intention-to-treat population. The study is registered with ClinicalTrials.gov, NCT03808662, and is complete. FINDINGS From Jan 1, 2019, to July 31, 2021, 106 patients were randomly assigned to standard of care (n=51; 23 patients with breast cancer and 28 patients with NSCLC) or SBRT plus standard of care (n=55; 24 patients with breast cancer and 31 patients with NSCLC). 16 (34%) of 47 patients with breast cancer had triple-negative disease, and 51 (86%) of 59 patients with NSCLC had no actionable driver mutation. The study was closed to accrual before reaching the targeted sample size, after the primary efficacy endpoint was met during a preplanned interim analysis. The median follow-up was 11·6 months for patients in the standard-of-care group and 12·1 months for patients in the SBRT group. The median progression-free survival was 3·2 months (95% CI 2·0-4·5) for patients in the standard-of-care group versus 7·2 months (4·5-10·0) for patients in the SBRT group (hazard ratio [HR] 0·53, 95% CI 0·35-0·81; p=0·0035). The median progression-free survival was higher for patients with NSCLC in the SBRT group than for those with NSCLC in the standard-of-care group (10·0 months [7·2-not reached] vs 2·2 months [95% CI 2·0-4·5]; HR 0·41, 95% CI 0·22-0·75; p=0·0039), but no difference was found for patients with breast cancer (4·4 months [2·5-8·7] vs 4·2 months [1·8-5·5]; 0·78, 0·43-1·43; p=0·43). Grade 2 or worse adverse events occurred in 21 (41%) patients in the standard-of-care group and 34 (62%) patients in the SBRT group. Nine (16%) patients in the SBRT group had grade 2 or worse toxicities related to SBRT, including gastrointestinal reflux disease, pain exacerbation, radiation pneumonitis, brachial plexopathy, and low blood counts. INTERPRETATION The trial showed that progression-free survival was increased in the SBRT plus standard-of-care group compared with standard of care only. Oligoprogression in patients with metastatic NSCLC could be effectively treated with SBRT plus standard of care, leading to more than a four-times increase in progression-free survival compared with standard of care only. By contrast, no benefit was observed in patients with oligoprogressive breast cancer. Further studies to validate these findings and understand the differential benefits are warranted. FUNDING National Cancer Institute.
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Affiliation(s)
- Chiaojung Jillian Tsai
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA; Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada.
| | - Jonathan T Yang
- Department of Radiation Oncology, University of Washington, Seattle, WA, USA
| | - Narek Shaverdian
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Juber Patel
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Annemarie F Shepherd
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Juliana Eng
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - David Guttmann
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Randy Yeh
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA; Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Daphna Y Gelblum
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Azadeh Namakydoust
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Isabel Preeshagul
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Shanu Modi
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Andrew Seidman
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Tiffany Traina
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Pamela Drullinsky
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jessica Flynn
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Zhigang Zhang
- Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Andreas Rimner
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Erin F Gillespie
- Department of Radiation Oncology, University of Washington, Seattle, WA, USA
| | - Daniel R Gomez
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Nancy Y Lee
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Michael Berger
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Mark E Robson
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Jorge S Reis-Filho
- Department of Pathology and Laboratory Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Nadeem Riaz
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Charles M Rudin
- Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Simon N Powell
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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Friedes C, Yegya-Raman N, Zhang S, Iocolano M, Cohen RB, Aggarwal C, Thompson JC, Marmarelis ME, Levin WP, Cengel KA, Ciunci CA, Singh AP, D'Avella C, Davis CW, Langer CJ, Feigenberg SJ. Patterns of Failure in Metastatic NSCLC Treated With First Line Pembrolizumab and Use of Local Therapy in Patients With Oligoprogression. Clin Lung Cancer 2024; 25:50-60.e6. [PMID: 37813713 DOI: 10.1016/j.cllc.2023.09.002] [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: 06/05/2023] [Revised: 08/14/2023] [Accepted: 09/13/2023] [Indexed: 10/11/2023]
Abstract
INTRODUCTION The patterns of failure (POF) for metastatic non-small-cell lung cancer (mNSCLC) treated with immunotherapy are not well established. METHODS We conducted a retrospective cohort study of mNSCLC that received first-line pembrolizumab with or without chemotherapy at a single academic center from 2015 to 2021. We defined POF with 2 classifications: 1) local, regional, or distant failure, or 2) failure in existing lesions, new lesions, or a combination. Oligoprogression was defined as disease progression (PD) in ≤3 sites of failure. Overall survival (OS) was measured via Kaplan-Meier and modelled with Cox regression. RESULTS Of 298 patients identified, 198 had PD. Using POF classification 1, most failures were distant (43.9%) or a combination of locoregional and distant (34.4%). For POF classification 2, failures occurred in a combination of new and existing lesions (45.0%), existing lesions alone (33.3%), or in new lesions only (21.7%). Oligoprogression occurred in 39.9% (n = 79) cases. Median OS was higher in the following: PD in existing lesions vs. new or new + existing lesions (28.7 vs. 20.2 vs. 13.9 months, P < .001) and oligoprogression vs. polyprogression (35.1 vs. 12.2 months, P < .001). In oligoprogression, median OS was better for those who received radiation to all sites of PD (62.2 months) than for those who changed systemic therapy (22.9 months, P = .007). On multivariable analysis, radiation for oligoprogression (HR 0.35, 95% CI: 0.20-0.62, P < .001) was associated with improved OS. CONCLUSIONS In mNSCLC treated with pembrolizumab, oligoprogression is relatively common. Randomized data are needed to define the benefits of radiation in oligoprogressive mNSCLC.
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Affiliation(s)
- Cole Friedes
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA.
| | - Nikhil Yegya-Raman
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Siqi Zhang
- Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia, PA
| | - Michelle Iocolano
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Roger B Cohen
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Charu Aggarwal
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Jeffrey C Thompson
- Division of Pulmonary, Allergy, and Critical Care, University of Pennsylvania Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Melina E Marmarelis
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - William P Levin
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Keith A Cengel
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Christine A Ciunci
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Aditi P Singh
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Christopher D'Avella
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Christiana W Davis
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Corey J Langer
- Division of Hematology/Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Steven J Feigenberg
- Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
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Tam A, Eustace N, Kassardjian A, West H, Williams TM, Amini A. The Emerging Role of Radiotherapy in Oligoprogressive Non-Small Cell Lung Cancer. Surg Oncol Clin N Am 2023; 32:497-514. [PMID: 37182989 DOI: 10.1016/j.soc.2023.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Oligoprogressive disease (OPD) is an emerging concept that describes patients who have progression of disease in a limited number of metastatic sites while on systemic therapy. Growing evidence has suggested the integration of local ablative therapy with systemic agents in patients with OPD further improves survival. In oligoprogressive non-small cell lung cancer, stereotactic body radiotherapy may have an important role in the effective local control of selective progressing metastases, which may translate to better patient outcomes. This review explores the treatment paradigm of this subset of patients and provides an update on the current existing literature on this topic.
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Affiliation(s)
- Andrew Tam
- Department of Radiation Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, CA, USA
| | - Nicholas Eustace
- Department of Radiation Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, CA, USA
| | - Ari Kassardjian
- Department of Radiation Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, CA, USA
| | - Howard West
- Department of Medical Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, CA, USA
| | - Terence M Williams
- Department of Radiation Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, CA, USA
| | - Arya Amini
- Department of Radiation Oncology, City of Hope National Medical Center, 1500 East Duarte Road, Duarte, CA, USA.
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Aquilano M, Loi M, Visani L, Livi L, Nuyttens JJ. Is stereotactic body radiotherapy an effective treatment in metastatic lung cancer with oligoprogressive disease? Acta Oncol 2023; 62:298-304. [PMID: 36905644 DOI: 10.1080/0284186x.2023.2186187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Abstract
BACKGROUND Oligoprogression (OPD) is defined as a condition where limited progression (1-3 metastases) is observed in patients undergoing systemic cancer treatment. In this study we investigated the impact of stereotactic body radiotherapy (SBRT) in patients with OPD from metastatic lung cancer. MATERIAL AND METHODS Data from a cohort of consecutive patients with SBRT treated between June 2015 and August 2021 were collected. All extracranial metastatic sites of OPD from lung cancer were included. Dose regimens consisted of mainly 24 in 2 fractions, 30-51 Gy in 3 fractions, 30-55 Gy in 5 fractions, 52.5 Gy in 7 fractions and 44-56 Gy in 8 fractions. Kaplan-Meier method was used to calculate Overall Survival (OS), Local Control (LC), and Disease-Free Survival (DFS) from the start date of SBRT to the event. RESULTS Sixty-three patients, 34 female and 29 males were included. Median age was 75 years (range 25-83). All patients received concurrent systemic treatment before the start of the SBRT: 19 chemotherapy (CT), 26 CT plus immunotherapy (IT) or Tyrosin kinase inhibitors (TKI) and 18 IT/TKI. SBRT was delivered to the lung (n = 29), mediastinal node (n = 9), bone (n = 7), adrenal gland (n = 19), other visceral metastases (1) and other node metastases (n = 4). After a median follow-up of 17 months, median OS was 23 months. LC was 93% at 1 year and 87% at 2 years. DFS was 7 months. According to our results, there was no statistically significant correlation between prognostic factors and OS after SBRT in OPD patients. CONCLUSIONS Median DFS was 7 months, translating into the continuation of effective systemic treatment as other metastases grow slowly. In patients with oligoprogression disease, SBRT is a valid and efficient treatment that may enable postponing the switch of systemic line.
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Affiliation(s)
| | - Mauro Loi
- Department of Radiation Oncology, University of Florence, Florence, Italy
| | - Luca Visani
- Department of Radiation Oncology, University of Florence, Florence, Italy
| | - Lorenzo Livi
- Department of Biomedical, Experimental and Clinical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Joost J Nuyttens
- Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
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7
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Shepherd AF, Rimner A. Radiation strategy and techniques for metastatic pleural disease from thymic malignancies: extended abstract. MEDIASTINUM (HONG KONG, CHINA) 2022; 6:27. [PMID: 36164364 PMCID: PMC9385872 DOI: 10.21037/med-21-61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 06/01/2022] [Indexed: 06/16/2023]
Affiliation(s)
- Annemarie F Shepherd
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Andreas Rimner
- Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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Cheung P, Patel S, North SA, Sahgal A, Chu W, Soliman H, Ahmad B, Winquist E, Niazi T, Patenaude F, Lim G, Heng DYC, Dubey A, Czaykowski P, Wong RKS, Swaminath A, Morgan SC, Mangat R, Keshavarzi S, Bjarnason GA. Stereotactic Radiotherapy for Oligoprogression in Metastatic Renal Cell Cancer Patients Receiving Tyrosine Kinase Inhibitor Therapy: A Phase 2 Prospective Multicenter Study. Eur Urol 2021; 80:693-700. [PMID: 34399998 DOI: 10.1016/j.eururo.2021.07.026] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/29/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Despite the paucity of prospective evidence, stereotactic radiotherapy (SRT) is increasingly being considered in the setting of oligoprogression to delay the need to change systemic therapy. OBJECTIVE To determine the local control (LC), progression-free survival (PFS), cumulative incidence of changing systemic therapy, and overall survival (OS) after SRT to oligoprogressive metastatic renal cell carcinoma (mRCC) lesions in patients who are on tyrosine kinase inhibitor (TKI) therapy. DESIGN, SETTING, AND PARTICIPANTS A prospective multicenter study was performed to evaluate the use of SRT in oligoprogressive mRCC patients. Patients with mRCC who had previous stability or response after ≥3 mo of TKI therapy were eligible if they developed progression of five of fewer metastases. Thirty-seven patients with 57 oligoprogressive tumors were enrolled. INTERVENTION Oligoprogressive tumors were treated with SRT, and the same TKI therapy was continued afterward. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS Competing risk analyses and the Kaplan-Meir methodology were used to report the outcomes of interest. RESULTS AND LIMITATIONS The median duration of TKI therapy prior to study entry was 18.6 mo; 1-yr LC of the irradiated tumors was 93% (95% confidence interval [CI] 71-98%). The median PFS after SRT was 9.3 mo (95% CI 7.5-15.7 mo). The cumulative incidence of changing systemic therapy was 47% (95% CI 32-68%) at 1 yr, with a median time to change in systemic therapy of 12.6 mo (95% CI 9.6-17.4 mo). One-year OS was 92% (95% CI 82-100%). There were no grade 3-5 SRT-related toxicities. CONCLUSIONS LC of irradiated oligoprogressive mRCC tumors was high, and the need to change systemic therapy was delayed for a median of >1 yr. PATIENT SUMMARY The use of stereotactic radiotherapy in metastatic kidney cancer patients, who develop growth of a few tumors while on oral targeted therapy, can significantly delay the need to change to the next line of drug therapy.
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Affiliation(s)
- Patrick Cheung
- Department of Radiation Oncology, Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Samir Patel
- Division of Radiation Oncology, Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, Canada
| | - Scott A North
- Division of Medical Oncology, Department of Oncology, Cross Cancer Institute, University of Alberta, Edmonton, AB, Canada
| | - Arjun Sahgal
- Department of Radiation Oncology, Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - William Chu
- Department of Radiation Oncology, Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Hany Soliman
- Department of Radiation Oncology, Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Belal Ahmad
- Division of Radiation Oncology, Department of Oncology, London Health Sciences Centre, Western University, London, ON, Canada
| | - Eric Winquist
- Division of Medical Oncology, Department of Oncology, London Health Sciences Centre, Western University, London, ON, Canada
| | - Tamim Niazi
- Division of Radiation Oncology, Department of Oncology, Jewish General Hospital, McGill University, Montreal, QC, Canada
| | - Francois Patenaude
- Department of Oncology, Jewish General Hospital, McGill University, Montreal, QC, Canada
| | - Gerald Lim
- Division of Radiation Oncology, Department of Oncology, Tom Baker Cancer Centre, University of Calgary, Calgary, AB, Canada
| | - Daniel Yick Chin Heng
- Division of Medical Oncology, Department of Oncology, Tom Baker Cancer Centre, University of Calgary, Calgary, AB, Canada
| | - Arbind Dubey
- Department of Radiation Oncology, CancerCare Manitoba, University of Manitoba, Winnipeg, MB, Canada
| | - Piotr Czaykowski
- Department of Medical Oncology and Hematology, CancerCare Manitoba, University of Manitoba, Winnipeg, MB, Canada
| | - Rebecca K S Wong
- Radiation Medicine Program, Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Anand Swaminath
- Department of Oncology, Juravinski Cancer Centre, McMaster University, Hamilton, ON, Canada
| | - Scott C Morgan
- Division of Radiation Oncology, Department of Radiology, The Ottawa Hospital Cancer Centre, University of Ottawa, Ottawa, ON, Canada
| | | | - Sareh Keshavarzi
- Department of Biostatistics, Princess Margaret Cancer Centre, Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
| | - Georg A Bjarnason
- Division of Medical Oncology, Department of Medicine, Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, ON, Canada.
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Oligoprogression in Non-Small Cell Lung Cancer. Cancers (Basel) 2021; 13:cancers13225823. [PMID: 34830977 PMCID: PMC8616478 DOI: 10.3390/cancers13225823] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 12/26/2022] Open
Abstract
Simple Summary Several retrospective studies present evidence of oligoprogressive disease (OPD) in patients with non-small cell lung cancer (NSCLC) with driver mutations such as EGFR. The strategy of local ablative therapy (LAT) with radiotherapy, followed by the continuation of the same anticancer drug therapy beyond progression disease, is recommended in the current NCCN guideline. Although evidence of the use of this strategy in the treatment of the driver mutation-negative NSCLC is missing, LAT with radiotherapy for OPD after combination therapy of immune checkpoint inhibitor with cytotoxic chemotherapy is expected. Tumors outside of the radiation field may further respond to the immune checkpoint inhibitors due to an abscopal effect. In the future, to achieve long-term survival in advanced NSCLC, it will be important to validate this treatment strategy via prospective comparative studies and to actively implement it in clinical practice. Abstract We reviewed the literature on oligoprogressive disease (OPD) and local ablative therapy (LAT) in patients with advanced non-small cell lung cancer (NSCLC). The frequency of OPD varies depending on its definition and is estimated to be between 15–47%. The implications of the strategy of continuing the same anticancer agents beyond progressive disease after LAT with radiation therapy for OPD are based on the concept of progression in which only a small number of lesions, not more than about four, proliferate after chemotherapy. In the case of OPD harboring driver mutations such as EGFR, prospective studies are underway. However, evidence from retrospective studies support this strategy, which is currently recommended in some guidelines. The prognosis in OPD cases during the administration of an immune checkpoint inhibitor (ICI) is relatively promising. Additionally, LAT with radiation for OPD after the first-line treatment of ICI with cytotoxic chemotherapy may overcome the resistance to the combination drug therapy due to an abscopal effect. To achieve long-term survival in advanced-stage NSCLC, it is important to verify the optimal method and timing of the therapy through prospective comparative studies as well as patient selection based on patient characteristics and biomarker levels.
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Meng C, Wei J, Tian J, Ma J, Liu N, Yuan Z, Zhao L, Wang P. Estimating survival and clinical outcome in advanced non-small cell lung cancer with bone-only metastasis using molecular markers. J Bone Oncol 2021; 31:100394. [PMID: 34703756 PMCID: PMC8524192 DOI: 10.1016/j.jbo.2021.100394] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 10/02/2021] [Accepted: 10/02/2021] [Indexed: 12/25/2022] Open
Abstract
Studies about prognostic factors of NSCLC patients with BOM are lacking. Five significant independent prognostic factors for them were found. We developed a GPA model to estimate life expectancy and to guide interventions. The more distal metastases to the spine, the worse the prognosis.
Objectives This retrospective study investigated prognostic factors in advanced non-small cell lung cancer (NSCLC) with bone-only metastasis, and developed a graded prognostic assessment (GPA) model to estimate patient survival. Methods The primary endpoint was overall survival. We investigated the patients with advanced NSCLC with bone-only metastasis at the initial diagnosis and diagnosed between 2013 and 2019 in our hospital. A log-rank test and Cox proportional hazards model were used to examine factors. A GPA model was developed in the training set based on the factors that were determined significant according to their hazard ratios and verified by the validation set. Results We finally included 220 patients for analysis. These patients were divided into two groups, 147 cases for the training cohort and 73 for the validation cohort. The following were significant independent prognostic factors, and were included in the GPA model: smoking; EGFR (epidermal growth factor receptor) sensitive/ALK (anaplastic lymphoma kinase) mutations; loss of weight; hypoalbuminemia; and primary site treated by surgery or radiotherapy. GPA score of nil was assigned to smoking, without sensitive mutations, loss of weight, hypoalbuminemia, and without local treatment of primary site; the corresponding superior alternatives were scored 1.5, 2.0, 1.5, 1.5, and 1.5, respectively. The median survival times of patients with GPA scores of nil to 3.0, 3.5 to 6.0, and 6.5 to 8.0 were 14.2, 29.5, and 56.6 months in the training set (P < 0.001) and 15.2, 31.2, and 54.0 months in the validation set (P < 0.001). Conclusion The survival time of patients with NSCLC with bone-only metastasis was dramatically influenced by the presence of the determined prognostic factors. The GPA model developed in this study may be a useful clinical tool to estimate the life expectancy of these patients, and guide treatment.
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Key Words
- ALK, anaplastic lymphoma kinase
- BOM, bone only metastasis
- Bone-only metastasis
- ECOG, Eastern Cooperative Oncology Group
- EGFR, epidermal growth factor receptor
- GPA, graded prognostic assessment
- Graded prognostic assessment model
- KRAS, kristen rat sarcoma
- MST, median survival time
- NSCLC, non-small cell lung cancer
- Non-small cell lung cancer
- OS, overall survival
- Prognostic factors
- SM, sensitive mutations
- SREs, skeletal-related events
- TKIs, tyrosine kinase inhibitors
- TNM, tumor-node-metastasis
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Affiliation(s)
- Chunliu Meng
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Jia Wei
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Jia Tian
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Jintao Ma
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Ningbo Liu
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Zhiyong Yuan
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Lujun Zhao
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
| | - Ping Wang
- Department of Radiation Oncology, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Tianjin Key Laboratory of Cancer Prevention and Therapy, Tianjin's Clinical Research Center for Cancer, Tianjin 300060, China
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Chen X, Chen H, Poon I, Erler D, Badellino S, Biswas T, Dagan R, Foote M, Louie AV, Ricardi U, Sahgal A, Redmond KJ. Late metastatic presentation is associated with improved survival and delayed wide-spread progression after ablative stereotactic body radiotherapy for oligometastasis. Cancer Med 2021; 10:6189-6198. [PMID: 34432390 PMCID: PMC8446561 DOI: 10.1002/cam4.4133] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 12/25/2022] Open
Abstract
Background Stereotactic body radiotherapy (SBRT) is increasingly used to treat oligometastatic disease (OMD), but the effect of metastasis timing on patient outcomes remains uncertain. Methods An international database of patients with OMD treated with SBRT was assembled with rigorous quality assurance. Early versus late metastases were defined as those diagnosed ≤24 versus >24 months from the primary tumor. Overall survival (OS), progression‐free survival (PFS), and incidences of wide‐spread progression (WSP) were estimated using multivariable Cox proportional hazard models stratified by primary tumor types. Results The database consists of 1033 patients with median follow‐up of 24.1 months (0.3–104.7). Late metastatic presentation (N = 427) was associated with improved OS compared to early metastasis (median survival 53.6 vs. 33.0 months, hazard ratio [HR] 0.59, 95% confidence interval [CI]: 0.47–0.72, p < 0.0001). Patients with non‐small cell lung cancer (NSCLC, N = 255, HR 0.49, 95% CI: 0.33–0.74, p = 0.0005) and colorectal cancer (N = 235, HR 0.50, 95% CI: 0.30–0.84, p = 0.008) had better OS if presenting with late metastasis. Late metastasis correlated with longer PFS (median 17.1 vs. 9.0 months, HR 0.71, 95% CI: 0.61–0.83, p < 0.0001) and lower 2‐year incidence of WSP (26.1% vs. 43.6%, HR 0.60, 95% CI: 0.49–0.74, p < 0.0001). Fewer WSP were observed in patients with NSCLC (HR 0.52, 95% CI: 0.33–0.83, p = 0.006) and kidney cancer (N = 63, HR 0.37, 95% CI: 0.14–0.97, p = 0.044) with late metastases. Across cancer types, greater SBRT target size was a significant predictor for worse OS. Conclusion Late metastatic presentation is associated with improved survival and delayed progression in patients with OMD treated with SBRT.
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Affiliation(s)
- Xuguang Chen
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, USA
| | - Hanbo Chen
- Department of Radiation Oncology, Sunnybrook Odette Cancer Center, University of Toronto, Toronto, ON, Canada
| | - Ian Poon
- Department of Radiation Oncology, Sunnybrook Odette Cancer Center, University of Toronto, Toronto, ON, Canada
| | - Darby Erler
- Department of Radiation Oncology, Sunnybrook Odette Cancer Center, University of Toronto, Toronto, ON, Canada
| | | | - Tithi Biswas
- University Hospitals Seidman Cancer Center, Case Western Reserve University, Cleveland, OH, USA
| | - Roi Dagan
- Department of Radiation Oncology, University of Florida, Jacksonville, FL, USA
| | - Matthew Foote
- Department of Radiation Oncology, University of Queensland, Princess Alexandra Hospital, Queensland, Australia
| | - Alexander V Louie
- Department of Radiation Oncology, Sunnybrook Odette Cancer Center, University of Toronto, Toronto, ON, Canada
| | | | - Arjun Sahgal
- Department of Radiation Oncology, Sunnybrook Odette Cancer Center, University of Toronto, Toronto, ON, Canada
| | - Kristin J Redmond
- Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, USA
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