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Nakazono M, Urabe F, Iwatani K, Imai Y, Tashiro K, Honda M, Koike Y, Shimomura T, Sato S, Takahashi H, Miki K, Aoki M, Kimura T. Patients with PSA below 0.2 ng/mL at 8 years post high-dose-rate brachytherapy have an extremely low risk of subsequent recurrence. Int J Urol 2023; 30:1147-1154. [PMID: 37650359 DOI: 10.1111/iju.15289] [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: 04/13/2023] [Accepted: 08/17/2023] [Indexed: 09/01/2023]
Abstract
OBJECTIVES We have analyzed the long-term follow-up data of patients with prostate cancer (PCa) who underwent high-dose-rate brachytherapy (HDR-BT) and external beam radiotherapy (EBRT) combined with long-term androgen deprivation therapy (ADT). The objective was to determine the optimal time for cessation of PSA monitoring after HDR-BT. METHODS We included 309 patients with clinical stage T1c-T4 N0-1 M0 PCa who received HDR-BT and EBRT combined with long-term ADT between 2005 and 2018. We stratified the patients based on their prostate-specific antigen (PSA) levels and identified the factors associated with biochemical recurrence (BCR) and clinical progression (CP). RESULTS The median follow-up duration was 98 months (range: 31-207 months). Among the 306 patients, 76 developed BCR and 47 developed CP subsequently. We found that the PSA levels at 3, 5, and 8 years significantly correlated with the oncological outcomes of brachytherapy. No patient with a PSA level ≤ 0.2 ng/mL at 8 years later developed BCR or CP. CONCLUSION Our long-term data suggest that in the presence of a PSA level ≤ 0.2 ng/mL at 8 years later, PSA monitoring may be safely discontinued due to the extremely low risk of subsequent oncological events. The data presented in this study will assist clinicians in determining the optimal management strategy for patients with PCa following HDR-BT and EBRT combined with long-term ADT.
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Affiliation(s)
- Minoru Nakazono
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Fumihiko Urabe
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Kosuke Iwatani
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Yu Imai
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Kojiro Tashiro
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Mariko Honda
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Yusuke Koike
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Tatsuya Shimomura
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Shun Sato
- Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan
| | - Hiroyuki Takahashi
- Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan
| | - Kenta Miki
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
| | - Manabu Aoki
- Department of Radiology, The Jikei University School of Medicine, Tokyo, Japan
| | - Takahiro Kimura
- Department of Urology, The Jikei University School of Medicine, Tokyo, Japan
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Mee SF, Polan DF, Dewaraja YK, Cuneo KC, Gemmete JJ, Evans JR, Lawrence TS, Dow JS, Mikell JK. Stereotactic body radiation therapy (SBRT) following Yttrium-90 ( 90Y) selective internal radiation therapy (SIRT): a feasibility planning study using 90Y delivered dose. Phys Med Biol 2023; 68:065003. [PMID: 36780696 PMCID: PMC10001703 DOI: 10.1088/1361-6560/acbbb5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 02/13/2023] [Indexed: 02/15/2023]
Abstract
Objective.90Y selective internal radiation therapy (SIRT) treatment of hepatocellular carcinoma (HCC) can potentially underdose lesions, as identified on post-therapy PET/CT imaging. This study introduces a methodology and explores the feasibility for selectively treating SIRT-underdosed HCC lesions, or lesion subvolumes, with stereotactic body radiation therapy (SBRT) following post-SIRT dosimetry.Approach. We retrospectively analyzed post-treatment PET/CT images of 20 HCC patients after90Y SIRT. Predicted tumor response from SIRT was quantified based on personalized post-therapy dosimetry and corresponding response models. Predicted non-responding tumor regions were then targeted with a hypothetical SBRT boost plan using a framework for selecting eligible tumors and tumor subregions. SBRT boost plans were compared to SBRT plans targeting all tumors irrespective of SIRT dose with the same prescription and organ-at-risk (OAR) objectives. The potential benefit of SIRT followed by a SBRT was evaluated based on OAR dose and predicted toxicity compared to the independent SBRT treatment.Main results. Following SIRT, 14/20 patients had at least one predicted non-responding tumor considered eligible for a SBRT boost. When comparing SBRT plans, 10/14 (71%) SBRTboostand 12/20 (60%) SBRTaloneplans were within OAR dose constraints. For three patients, SBRTboostplans were within OAR constraints while SBRTaloneplans were not. Across the 14 eligible patients, SBRTboostplans had significantly less dose to the healthy liver (decrease in mean dose was on average ± standard deviation, 2.09 Gy ± 1.99 Gy, ) and reduced the overall targeted PTV volume (39% ± 21%) compared with SBRTalone.Significance. A clinical methodology for treating HCC using a synergized SIRT and SBRT approach is presented, demonstrating that it could reduce normal tissue toxicity risk in a majority of our retrospectively evaluated cases. Selectively targeting SIRT underdosed HCC lesions, or lesion subvolumes, with SBRT could improve tumor control and patient outcomes post-SIRT and allow SIRT to function as a target debulking tool for cases when SBRT is not independently feasible.
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Affiliation(s)
- Stephen F Mee
- Department of Radiology, University of Michigan, Ann Arbor, MI, United States of America.,School of Medicine, Wayne State University, Detroit, MI, United States of America
| | - Daniel F Polan
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States of America
| | - Yuni K Dewaraja
- Department of Radiology, University of Michigan, Ann Arbor, MI, United States of America
| | - Kyle C Cuneo
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States of America
| | - Joseph J Gemmete
- Department of Radiology, University of Michigan, Ann Arbor, MI, United States of America
| | - Joseph R Evans
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States of America
| | - Theodore S Lawrence
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States of America
| | - Janell S Dow
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States of America
| | - Justin K Mikell
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States of America
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Ni L, Chen K, Phuong C, Sabbagh AR, Wong AC, Mohamad O, Hsu IC. Outcomes of salvage high dose-rate brachytherapy with or without pelvic external beam radiotherapy in patients with palpable local recurrence of prostate cancer after radical prostatectomy. Brachytherapy 2023; 22:304-309. [PMID: 36623988 DOI: 10.1016/j.brachy.2022.12.002] [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: 07/12/2022] [Revised: 10/10/2022] [Accepted: 12/07/2022] [Indexed: 01/09/2023]
Abstract
PURPOSE This study aims to evaluate the outcomes and toxicities in patients with palpable local recurrence of prostate cancer after radical prostatectomy (RP), who were treated with salvage high dose-rate brachytherapy (HDR-BT) with or without pelvic external beam radiotherapy (EBRT). METHODS This retrospective review included patients with palpable local recurrence of prostate cancer after RP who underwent salvage HDR-BT at a single institution between 2002 and 2020. HDR-BT regimens included 950 cGy x 2 (N = 4) or 1500 cGy x 1 (N = 2) combined with EBRT; or monotherapy with 950 cGy x 4 (N = 1) or 800 cGy x 2 (N = 1). Toxicity was graded according to CTCAE Version 5.0. RESULTS A total of 8 patients were included. Median follow-up was 49 months (range: 9-223 months). Median age at time of salvage brachytherapy was 68 years (range: 59-85 years). Seven out of 8 patients were alive at last follow-up. There have been no locoregional recurrences. Three patients developed distant metastatic disease. One patient developed acute grade 3 urinary obstruction requiring catheterization, which lasted for 1 day postbrachytherapy. One patient developed late grade 3 urinary incontinence 18 months after brachytherapy. There were no other grade 2+ toxicities. CONCLUSIONS This study demonstrates the safety and efficacy of salvage HDR-BT in the setting of palpable local recurrence of prostate cancer after RP, with durable locoregional control and acceptable rates of toxicity. HDR-BT should be further explored as an option for dose-escalated salvage radiotherapy after prior radical prostatectomy.
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Affiliation(s)
- Lisa Ni
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA
| | - Katherine Chen
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA
| | - Christina Phuong
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA
| | - Ali R Sabbagh
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA
| | - Anthony C Wong
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA
| | - Osama Mohamad
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA
| | - I-Chow Hsu
- University of California San Francisco, Department of Radiation Oncology, San Francisco, CA.
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Pommier P, Ferré M, Blanchard P, Martin É, Peiffert D, Robin S, Hannoun-Lévi JM, Marchesi V, Cosset JM. Prostate cancer brachytherapy: SFRO guidelines 2021. Cancer Radiother 2021; 26:344-355. [PMID: 34955422 DOI: 10.1016/j.canrad.2021.11.019] [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: 10/19/2022]
Abstract
Prostate brachytherapy techniques are described, concerning both permanent seed implant and high dose rate brachytherapy. The following guidelines are presented: brachytherapy indications, implant procedure for permanent low dose rate implants and high dose rate with source projector, as well as dose and dose-constraints objectives, immediate postoperative management, post-treatment evaluation, and long-term follow-up.
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Affiliation(s)
- P Pommier
- Département de radiothérapie, centre Léon-Bérard, 28, rue Laennec, 69373 Lyon cedex 08, France.
| | - M Ferré
- Département de physique médicale, institut Paoli-Calmettes, 232, boulevard Sainte-Marguerite, 13009 Marseille, France
| | - P Blanchard
- Département de radiothérapie, institut Gustave-Roussy, 114, rue Édouard-Vaillant, 94805 Villejuif cedex, France
| | - É Martin
- Département de radiothérapie, centre Georges-François-Leclerc, 1, rue du Pr-Marion, BP 77980, 21079 Dijon cedex, France
| | - D Peiffert
- Service universitaire de radiothérapie, Institut de cancérologie de Lorraine centre Alexis-Vautrin, 6, avenue de Bourgogne, CS 30519, 54519 Vandœuvre-lès-Nancy cedex, France
| | - S Robin
- Département de radiothérapie, centre Léon-Bérard, 28, rue Laennec, 69373 Lyon cedex 08, France
| | - J-M Hannoun-Lévi
- Département de radiothérapie, centre Antoine-Lacassagne, 33, avenue de Valombrose, 06189 Nice cedex 2, France
| | - V Marchesi
- Unité de physique médicale, Institut de cancérologie de Lorraine centre Alexis-Vautrin, avenue de Bourgogne, 54519 Vandœuvre-lès-Nancy, France
| | - J M Cosset
- Centre de radiothérapie Charlebourg/La Défense, groupe Améthyst, 65, avenue Foch, 92250 La Garenne-Colombes, France
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Tamihardja J, Lutyj P, Kraft J, Lisowski D, Weick S, Flentje M, Polat B. Two-Weekly High-Dose-Rate Brachytherapy Boost After External Beam Radiotherapy for Localized Prostate Cancer: Long-Term Outcome and Toxicity Analysis. Front Oncol 2021; 11:764536. [PMID: 34900712 PMCID: PMC8660669 DOI: 10.3389/fonc.2021.764536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 11/12/2021] [Indexed: 12/16/2022] Open
Abstract
Purpose Evaluation of clinical outcome of two-weekly high-dose-rate brachytherapy boost after external beam radiotherapy (EBRT) for localized prostate cancer. Methods 338 patients with localized prostate cancer receiving definitive EBRT followed by a two-weekly high-dose-rate brachytherapy boost (HDR-BT boost) in the period of 2002 to 2019 were analyzed. EBRT, delivered in 46 Gy (DMean) in conventional fractionation, was followed by two fractions HDR-BT boost with 9 Gy (D90%) two and four weeks after EBRT. Androgen deprivation therapy (ADT) was added in 176 (52.1%) patients. Genitourinary (GU)/gastrointestinal (GI) toxicity was evaluated utilizing the Common Toxicity Criteria for Adverse Events (version 5.0) and biochemical failure was defined according to the Phoenix definition. Results Median follow-up was 101.8 months. 15 (4.4%)/115 (34.0%)/208 (61.5%) patients had low-/intermediate-/high-risk cancer according to the D`Amico risk classification. Estimated 5-year and 10-year biochemical relapse-free survival (bRFS) was 84.7% and 75.9% for all patients. The estimated 5-year bRFS was 93.3%, 93.4% and 79.5% for low-, intermediate- and high-risk disease, respectively. The estimated 10-year freedom from distant metastasis (FFM) and overall survival (OS) rates were 86.5% and 70.0%. Cumulative 5-year late GU toxicity and late GI toxicity grade ≥ 2 was observed in 19.3% and 5.0% of the patients, respectively. Cumulative 5-year late grade 3 GU/GI toxicity occurred in 3.6%/0.3%. Conclusions Two-weekly HDR-BT boost after EBRT for localized prostate cancer showed an excellent toxicity profile with low GU/GI toxicity rates and effective long-term biochemical control.
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Affiliation(s)
- Jörg Tamihardja
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
| | - Paul Lutyj
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
| | - Johannes Kraft
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
| | - Dominik Lisowski
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
| | - Stefan Weick
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
| | - Michael Flentje
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
| | - Bülent Polat
- Department of Radiation Oncology, University of Würzburg, Würzburg, Germany
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Hjälm-Eriksson M, Nilsson S, Brandberg Y, Johansson H, Lennernäs B, Lundell G, Castellanos E, Ullén A. High rate of local control and cure at 10 years after treatment of prostate cancer with external beam radiotherapy and high-dose-rate brachytherapy: a single centre experience. Acta Oncol 2021; 60:1301-1307. [PMID: 34498986 DOI: 10.1080/0284186x.2021.1953706] [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: 10/20/2022]
Abstract
BACKGROUND AND PURPOSE To analyse the cumulative incidence of any failure (AF), prostate cancer-specific failure (PCSF), any death (AD), prostate cancer-specific death (PCSD), and local control in 2387 men with prostate cancer (PC), consecutively treated with combined high-dose-rate brachytherapy (HDRBT) and external beam radiotherapy (EBRT) from 1998 to 2010. MATERIAL AND METHODS A retrospective, single-institution study of men with localised PC. The mean age was 66 years and 54.7% had high-risk PC according to the Cambridge prognostic group (CPG) classification. The treatment was delivered as EBRT (2 Gy × 25) and HDRBT (10 Gy × 2) with combined androgen blockade (CAB). The median follow-up was 10.2 years. RESULTS The cumulative incidence of PCSD at 10 years was 5% [CI 95% 0.04-0.06]. The 10 years PCSD per risk group were: low (L) 0.4%, intermediate favourable (IF) 1%, intermediate unfavourable (IU) 4.3%, high-risk favourable (HF) 5.8%, and high-risk unfavourable (HU) 13.9%. The PCSF rate at 10 years was 16.5% [CI 95% 0.15-0.18]. The PCSF per risk group at 10 years were: L 2.5%, IF 5.5%, IU 15.9%, HF 15.6%, and HU 38.99%. PCSF occurred in 399 men, of whom 15% were found to have local failure. The estimated frequency of local failure in the entire cohort was 1.2%. CONCLUSIONS HDRBT combined with EBRT is an effective treatment with long-term overall survival and excellent local control for patients with PC. The low rate of local recurrence among men with relapse suggests that these patients were micro metastasised at time of treatment, which calls for improved methods to detect disseminated disease.
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Affiliation(s)
- Marie Hjälm-Eriksson
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
- Department of Oncology, Capio S:t Göran’s Hospital, Stockholm, Sweden
| | - Sten Nilsson
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
- Department of Pelvic Cancer, Genitourinary Oncology and Urology Unit, Karolinska University Hospital, Stockholm, Sweden
| | - Yvonne Brandberg
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
- Department of Pelvic Cancer, Psychosocial Unit, Karolinska University Hospital, Stockholm, Sweden
| | - Hemming Johansson
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
| | - Bo Lennernäs
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
| | - Göran Lundell
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
| | - Enrique Castellanos
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
- Department of Pelvic Cancer, Genitourinary Oncology and Urology Unit, Karolinska University Hospital, Stockholm, Sweden
| | - Anders Ullén
- Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden
- Department of Pelvic Cancer, Genitourinary Oncology and Urology Unit, Karolinska University Hospital, Stockholm, Sweden
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The effectiveness of high-dose-rate brachytherapy with external beam radiotherapy for clinically locally advanced and node-positive prostate cancer: long-term results of a retrospective study. Int J Clin Oncol 2021; 26:2310-2317. [PMID: 34494172 DOI: 10.1007/s10147-021-02023-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 08/24/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND No standard treatment exists for locally advanced prostate cancer (PC). This study evaluated the long-term treatment outcomes and toxicity in patients with clinically locally advanced and/or lymph node (LN)-positive PC who underwent high-dose-rate brachytherapy (HDR-BT) with external beam radiotherapy (EBRT). METHODS The treatment outcomes and toxicities of 152 patients with PC who underwent HDR-BT with EBRT and had at least 2 years of observation were examined. The treatment dose was 19- and 13-Gy HDR-BT in two and single fractions, respectively, both combined with external irradiation of 46 Gy in 23 fractions. Long-term androgen deprivation therapy (ADT) for patients harboring very high-risk tumors was used in combination. RESULTS The median observation period was 59.7 (24.4-182.1) months. The 5-year prostate cancer-specific and recurrence-free (RFS) survival rates were 99.0% and 91.8%, respectively, with only two PC mortalities. When 5-year RFS was examined for each parameter, RFS was significantly lower in pre-radiotherapy (pre-RT) prostate-specific antigen (PSA) > 0.5 ng/mL (77.1%; p = 0.008), and presence of LN metastasis (68.1%; p = 0.017). Multivariable analysis demonstrated that pre-RT PSA (HR, 4.68; 95% CI, 1.39-15.67; p = 0.012) and presence of LN metastasis (HR, 4.70; 95% CI, 1.24-17.74; p = 0.022) were independent recurrence predictors. The 5-year cumulative incidence rate of grade ≥ 2 toxicities in genitourinary and gastrointestinal tracts were 15.4% and 1.3%, respectively. CONCLUSIONS HDR-BT combined with EBRT and long-term ADT shows promising disease control and tolerant toxicities for clinically locally advanced and LN-positive PC.
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Choudhury A, Henry Md Frcr A, Mitin Md PhD T, Chen Md Mph R, Joseph Md Frcr N, Spratt Md PhD DE. Photons, Protons, SBRT, Brachytherapy-What Is Leading the Charge for the Management of Prostate Cancer? A Perspective From the GU Editorial Team. Int J Radiat Oncol Biol Phys 2021; 110:1114-1121. [PMID: 34171236 DOI: 10.1016/j.ijrobp.2021.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 01/03/2021] [Indexed: 01/22/2023]
Affiliation(s)
- Ananya Choudhury
- Department of Clinical Oncology, Christie NHS Foundation Trust, Manchester, United Kingdom; Division of Cancer Sciences, University of Manchester and Christie NHS Foundation Trust, Manchester, United Kingdom.
| | - Ann Henry Md Frcr
- Department of Clinical Oncology, Leeds Teaching Hospitals NHS Trust and the University of Leeds, Leeds, United Kingdom
| | - Timur Mitin Md PhD
- Knight Cancer Institute, Department of Radiation Medicine, Oregon Health and Science University, Portland, Oregon
| | - Ronald Chen Md Mph
- Department of Radiation Oncology, University of Kansas, Kansas City, Kansas
| | - Nuradh Joseph Md Frcr
- General Hospital Chilaw, Ministry of Health, Colombo, Sri Lanka; Sri Lanka Cancer Research Group
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Chen WC, Li Y, Lazar A, Altun A, Descovich M, Nano T, Ziemer B, Sudhyadhom A, Cunha A, Thomas H, Gottschalk A, Hsu IC, Roach M. Stereotactic Body Radiation Therapy and High-Dose-Rate Brachytherapy Boost in Combination With Intensity Modulated Radiation Therapy for Localized Prostate Cancer: A Single-Institution Propensity Score Matched Analysis. Int J Radiat Oncol Biol Phys 2020; 110:429-437. [PMID: 33385496 DOI: 10.1016/j.ijrobp.2020.12.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 12/01/2020] [Accepted: 12/22/2020] [Indexed: 01/31/2023]
Abstract
PURPOSE To perform a propensity-score matched analysis comparing stereotactic body radiation therapy (SBRT) boost and high-dose-rate (HDR) boost for localized prostate cancer. METHODS AND MATERIALS A single-institution retrospective chart review was conducted of men treated with pelvic external beam radiation therapy (EBRT) and SBRT boost (21 Gy and 19 Gy in 2 fractions) to the prostate for prostate cancer. A cohort treated at the same institution with HDR brachytherapy boost (19 Gy in 2 fractions) was compared. Propensity-score (PS) matching and multivariable Cox regression were used for analysis. Outcomes were biochemical recurrence freedom (BCRF) and metastasis freedom (MF). RESULTS One hundred thirty-one men were treated with SBRT boost and 101 with HDR boost with median follow-up of 73.4 and 186.0 months, respectively. In addition, 68.8% of men had high-risk and 26.0% had unfavorable-intermediate disease, and 94.3% received androgen deprivation therapy. Five- and 10-year unadjusted BCRF was 88.8% and 85.3% for SBRT and 91.8% and 74.6% for HDR boost (log-rank P = .3), and 5- and 10-year unadjusted MF was 91.7% and 84.3% for SBRT and 95.8% and 82.0% for HDR (log-rank P = .8). After adjusting for covariates, there was no statistically significant difference in BCRF (hazard ratio [HR] 0.81; 95% confidence interval [CI], 0.37-1.79; P = .6) or MF (HR 1.07; 95% CI, 0.44-2.57; P = .9) between SBRT and HDR boost. Similarly, after PS matching, there was no statistically significant difference between SBRT and HDR (BCRF: HR 0.66, 0.27-1.62, P = .4; MF: HR 0.84, 0.31-2.26, P = .7). Grade 3+ genitourinary and gastrointestinal toxicity in the SBRT cohort were 4.6% and 1.5%, and 3.0% and 0.0% in the HDR cohorts (P = .4, Fisher exact test). CONCLUSIONS SBRT boost plus pelvic EBRT for prostate cancer resulted in similar BCRF and MF to HDR boost in this single institution, PS matched retrospective analysis. Toxicity was modest. Prospective evaluation of SBRT boost for the treatment of unfavorable-intermediate and high-risk prostate cancer is warranted.
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Affiliation(s)
- William C Chen
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Yun Li
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Ann Lazar
- Division of Oral Epidemiology and Dental Public Health, University of California San Francisco, San Francisco, California; Division of Biostatistics, University of California San Francisco, San Francisco, California
| | - Aysu Altun
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Martina Descovich
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Tomi Nano
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Benjamin Ziemer
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Atchar Sudhyadhom
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Adam Cunha
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Horatio Thomas
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Alexander Gottschalk
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - I-Chow Hsu
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California
| | - Mack Roach
- Department of Radiation Oncology, University of California San Francisco, San Francisco, California.
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