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Baker S, Lechner L, Liu M, Chang JS, Cruz-Lim EM, Mou B, Jiang W, Bergman A, Schellenberg D, Alexander A, Berrang T, Bang A, Chng N, Matthews Q, Carolan H, Hsu F, Miller S, Atrchian S, Chan E, Ho C, Mohamed I, Lin A, Huang V, Mestrovic A, Hyde D, Lund C, Pai H, Valev B, Lefresne S, Arbour G, Yu I, Tyldesley S, Olson RA. Upfront Versus Delayed Systemic Therapy in Patients With Oligometastatic Cancer Treated With SABR in the Phase 2 SABR-5 Trial. Int J Radiat Oncol Biol Phys 2024; 118:1497-1506. [PMID: 38220069 DOI: 10.1016/j.ijrobp.2024.01.008] [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: 08/07/2023] [Revised: 01/02/2024] [Accepted: 01/03/2024] [Indexed: 01/16/2024]
Abstract
PURPOSE The optimal sequencing of local and systemic therapy for oligometastatic cancer has not been established. This study retrospectively compared progression-free survival (PFS), overall survival (OS), and SABR-related toxicity between upfront versus delay of systemic treatment until progression in patients in the SABR-5 trial. METHODS AND MATERIALS The single-arm phase 2 SABR-5 trial accrued patients with up to 5 oligometastases across SABR-5 between November 2016 and July 2020. Patients received SABR to all lesions. Two cohorts were retrospectively identified: those receiving upfront systemic treatment along with SABR and those for whom systemic treatment was delayed until disease progression. Patients treated for oligoprogression were excluded. Propensity score analysis with overlap weighting balanced baseline characteristics of cohorts. Bootstrap sampling and Cox regression models estimated the association of delayed systemic treatment with PFS, OS, and grade ≥2 toxicity. RESULTS A total of 319 patients with oligometastases underwent treatment on SABR-5, including 121 (38%) and 198 (62%) who received upfront and delayed systemic treatment, respectively. In the weighted sample, prostate cancer was the most common primary tumor histology (48%) followed by colorectal (18%), breast (13%), and lung (4%). Most patients (93%) were treated for 1 to 2 metastases. The median follow-up time was 34 months (IQR, 24-45). Delayed systemic treatment was associated with shorter PFS (hazard ratio [HR], 1.56; 95% CI, 1.15-2.13; P = .005) but similar OS (HR, 0.90; 95% CI, 0.51-1.59; P = .65) compared with upfront systemic treatment. Risk of grade 2 or higher SABR-related toxicity was reduced with delayed systemic treatment (odds ratio, 0.35; 95% CI, 0.15-0.70; P < .001). CONCLUSIONS Delayed systemic treatment is associated with shorter PFS without reduction in OS and with reduced SABR-related toxicity and may be a favorable option for select patients seeking to avoid initial systemic treatment. Efforts should continue to accrue patients to histology-specific trials examining a delayed systemic treatment approach.
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Affiliation(s)
- Sarah Baker
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada.
| | | | - Mitchell Liu
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | - Jee Suk Chang
- Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea
| | - Ella Mae Cruz-Lim
- University of British Columbia; BC Cancer-Kelowna, Department of Radiation Oncology, Kelowna, BC, Canada
| | - Ben Mou
- University of British Columbia; BC Cancer-Kelowna, Department of Radiation Oncology, Kelowna, BC, Canada
| | - Will Jiang
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada
| | - Alanah Bergman
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | - Devin Schellenberg
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada
| | - Abraham Alexander
- University of British Columbia; BC Cancer-Victoria, Department of Radiation Oncology, Victoria, BC, Canada
| | - Tanya Berrang
- University of British Columbia; BC Cancer-Victoria, Department of Radiation Oncology, Victoria, BC, Canada
| | - Andrew Bang
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | - Nick Chng
- University of British Columbia; BC Cancer-Prince George, Department of Radiation Oncology, Prince George, BC, Canada
| | - Quinn Matthews
- University of British Columbia; BC Cancer-Prince George, Department of Radiation Oncology, Prince George, BC, Canada
| | - Hannah Carolan
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | - Fred Hsu
- University of British Columbia; BC Cancer-Abbotsford, Department of Radiation Oncology, Abbotsford, BC, Canada
| | - Stacey Miller
- University of British Columbia; BC Cancer-Prince George, Department of Radiation Oncology, Prince George, BC, Canada
| | - Siavash Atrchian
- University of British Columbia; BC Cancer-Kelowna, Department of Radiation Oncology, Kelowna, BC, Canada
| | - Elisa Chan
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | - Clement Ho
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada
| | - Islam Mohamed
- University of British Columbia; BC Cancer-Kelowna, Department of Radiation Oncology, Kelowna, BC, Canada
| | - Angela Lin
- University of British Columbia; BC Cancer-Kelowna, Department of Radiation Oncology, Kelowna, BC, Canada
| | - Vicky Huang
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada
| | - Ante Mestrovic
- BC Cancer-Victoria, Department of Radiation Oncology, Victoria, BC, Canada
| | - Derek Hyde
- University of British Columbia; BC Cancer-Kelowna, Department of Radiation Oncology, Kelowna, BC, Canada
| | - Chad Lund
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada
| | - Howard Pai
- University of British Columbia; BC Cancer-Victoria, Department of Radiation Oncology, Victoria, BC, Canada
| | - Boris Valev
- University of British Columbia; BC Cancer-Victoria, Department of Radiation Oncology, Victoria, BC, Canada
| | - Shilo Lefresne
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | | | - Irene Yu
- University of British Columbia; BC Cancer-Surrey, Department of Radiation Oncology, Surrey, BC, Canada
| | - Scott Tyldesley
- University of British Columbia; BC Cancer-Vancouver, Department of Radiation Oncology, Vancouver, BC, Canada
| | - Rob A Olson
- University of British Columbia; BC Cancer-Prince George, Department of Radiation Oncology, Prince George, BC, Canada
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Olson R, Abraham H, Leclerc C, Benny A, Baker S, Matthews Q, Chng N, Bergman A, Mou B, Dunne EM, Schellenberg D, Jiang W, Chan E, Atrchian S, Lefresne S, Carolan H, Valev B, Tyldesley S, Bang A, Berrang T, Clark H, Hsu F, Louie AV, Warner A, Palma DA, Howell D, Barry A, Dawson L, Grendarova P, Walker D, Sinha R, Tsai J, Bahig H, Thibault I, Koul R, Senthi S, Phillips I, Grose D, Kelly P, Armstrong J, McDermott R, Johnstone C, Vasan S, Aherne N, Harrow S, Liu M. Single vs. multiple fraction non-inferiority trial of stereotactic ablative radiotherapy for the comprehensive treatment of oligo-metastases/progression: SIMPLIFY-SABR-COMET. BMC Cancer 2024; 24:171. [PMID: 38310262 PMCID: PMC10838428 DOI: 10.1186/s12885-024-11905-7] [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: 12/18/2023] [Accepted: 01/21/2024] [Indexed: 02/05/2024] Open
Abstract
BACKGROUND Radiotherapy delivery regimens can vary between a single fraction (SF) and multiple fractions (MF) given daily for up to several weeks depending on the location of the cancer or metastases. With limited evidence comparing fractionation regimens for oligometastases, there is support to explore toxicity levels to nearby organs at risk as a primary outcome while using SF and MF stereotactic ablative radiotherapy (SABR) as well as explore differences in patient-reported quality of life and experience. METHODS This study will randomize 598 patients in a 1:1 ratio between the standard arm (MF SABR) and the experimental arm (SF SABR). This trial is designed as two randomized controlled trials within one patient population for resource efficiency. The primary objective of the first randomization is to determine if SF SABR is non-inferior to MF SABR, with respect to healthcare provider (HCP)-reported grade 3-5 adverse events (AEs) that are related to SABR. Primary endpoint is toxicity while secondary endpoints include lesional control rate (LCR), and progression-free survival (PFS). The second randomization (BC Cancer sites only) will allocate participants to either complete quality of life (QoL) questionnaires only; or QoL questionnaires and a symptom-specific survey with symptom-guided HCP intervention. The primary objective of the second randomization is to determine if radiation-related symptom questionnaire-guided HCP intervention results in improved reported QoL as measured by the EuroQoL-5-dimensions-5levels (EQ-5D-5L) instrument. The primary endpoint is patient-reported QoL and secondary endpoints include: persistence/resolution of symptom reporting, QoL, intervention cost effectiveness, resource utilization, and overall survival. DISCUSSION This study will compare SF and MF SABR in the treatment of oligometastases and oligoprogression to determine if there is non-inferior toxicity for SF SABR in selected participants with 1-5 oligometastatic lesions. This study will also compare patient-reported QoL between participants who receive radiation-related symptom-guided HCP intervention and those who complete questionnaires alone. TRIAL REGISTRATION Clinicaltrials.gov identifier: NCT05784428. Date of Registration: 23 March 2023.
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Affiliation(s)
- Robert Olson
- University of British Columbia, Vancouver, Canada.
- University of Northern British Columbia, Prince George, Canada.
- BC Cancer - Prince George, 1215 Lethbridge Street, Prince George, BC, V2M7A9, Canada.
- Department of Radiation Oncology, BC Cancer - Centre for the North, 1215 Lethbridge Street, Prince George, British Columbia, V2M 7E9, Canada.
| | - Hadassah Abraham
- BC Cancer - Prince George, 1215 Lethbridge Street, Prince George, BC, V2M7A9, Canada
| | - Curtis Leclerc
- University of British Columbia, Vancouver, Canada
- BC Cancer - Prince George, 1215 Lethbridge Street, Prince George, BC, V2M7A9, Canada
| | | | - Sarah Baker
- BC Cancer - Surrey, Surrey, British Columbia, Canada
| | - Quinn Matthews
- BC Cancer - Prince George, 1215 Lethbridge Street, Prince George, BC, V2M7A9, Canada
| | - Nick Chng
- BC Cancer - Prince George, 1215 Lethbridge Street, Prince George, BC, V2M7A9, Canada
| | - Alanah Bergman
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
| | - Benjamin Mou
- BC Cancer - Kelowna, Kelowna, British Columbia, Canada
| | - Emma M Dunne
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
| | | | - Will Jiang
- BC Cancer - Surrey, Surrey, British Columbia, Canada
| | - Elisa Chan
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
| | | | - Shilo Lefresne
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
| | - Hannah Carolan
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
| | - Boris Valev
- BC Cancer- Victoria, Victoria, British Columbia, Canada
| | | | - Andrew Bang
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
| | - Tanya Berrang
- BC Cancer- Victoria, Victoria, British Columbia, Canada
| | - Haley Clark
- BC Cancer - Surrey, Surrey, British Columbia, Canada
| | - Fred Hsu
- BC Cancer- Abbotsford, Abbotsford, British Columbia, Canada
| | - Alexander V Louie
- Department of Radiation Oncology, Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
| | - Andrew Warner
- Department of Oncology, London Health Sciences Centre, London, Ontario, Canada
| | - David A Palma
- Department of Oncology, London Health Sciences Centre, London, Ontario, Canada
| | - Doris Howell
- Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | | | - Laura Dawson
- Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | | | - Debra Walker
- Patient partner, BC Cancer-Prince George, Prince George, BC, Canada
| | - Rishi Sinha
- Tom Baker Cancer Centre, Calgary, Alberta, Canada
| | - Jillian Tsai
- Princess Margaret Cancer Centre, Toronto, Ontario, Canada
| | - Houda Bahig
- Centre Hospitalier de l'Université de Montréal (CHUM), Montréal, Québec, Canada
| | | | - Rashmi Koul
- Cancer Care Manitoba, Winnipeg, Manitoba, Canada
| | | | - Iain Phillips
- Western General Hospital/Edinburgh Cancer Centre, Edinburgh, Scotland
| | - Derek Grose
- Beatson West of Scotland Cancer Centre, Glasgow, Scotland
| | - Paul Kelly
- Bon Secours Radiotherapy Cork (In Partnership with UPMC Hillman Cancer Centre), Cork, Ireland
| | | | | | - Candice Johnstone
- Medical College of Wisconsin, Milwaukee, Wisconsin, United States of America
| | - Srini Vasan
- Precision Cancer Center, Ashland, Kentucky, United States of America
| | - Noel Aherne
- Riverina Cancer Care Centre, Wagga Wagga, New South Wales, Australia
| | - Stephen Harrow
- Western General Hospital/Edinburgh Cancer Centre, Edinburgh, Scotland
| | - Mitchell Liu
- BC Cancer - Vancouver, Vancouver, British Columbia, Canada
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Kao J, Eckardt P, Mceachron J, Atalla C, Sangal A. Predicting long‑term survival following involved site radiotherapy for oligometastases. Oncol Lett 2024; 27:82. [PMID: 38249809 PMCID: PMC10797312 DOI: 10.3892/ol.2024.14216] [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: 05/13/2023] [Accepted: 08/25/2023] [Indexed: 01/23/2024] Open
Abstract
The majority of cancer-associated mortalities are due to distant metastases, and systemic therapy alone is generally not curative. Patients with oligometastases are amenable to involved site radiotherapy with the possibility of long-term disease-free survival; however, prognostic factors remain poorly defined. The present retrospective, single institution study consisted of consecutive adult patients with oligometastases from solid tumor malignancy referred to a single high volume radiation oncologist between January 2014 and December 2021. Oligometastases were defined as ≤5 extracranial or intracranial metastatic lesions where all sites of active disease are treatable, including patients requiring treatment of the primary tumor and/or regional lymph nodes. The study population consisted of 130 patients with 207 treated distant metastases. Radical radiotherapy was administered to all areas of known residual disease and included stereotactic radiotherapy (median dose, 27 Gy in 3 fractions) or intensity modulated radiotherapy (median dose, 50 Gy in 15 fractions). At a median follow-up of 28.8 months, the median overall survival was 37.9 months with a 4-year overall survival of 41.1%. The median progression-free survival was 12.3 months and the 4-year progression-free survival was 22.6%. On multivariate an1alysis, the strongest predictors of overall survival were age, ECOG performance status, primary prostate, breast or kidney tumor and pre-radiation serum albumin (P≤0.01 for all). Overall, the present study demonstrated that long-term overall survival was possible after radical treatment for oligometastases and identified potential prognostic factors.
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Affiliation(s)
- Johnny Kao
- Department of Radiation Oncology, Good Samaritan University Hospital, West Islip, NY 11795, USA
- Cancer Institute, Good Samaritan University Hospital, West Islip, NY 11795, USA
| | - Patricia Eckardt
- Department of Nursing, Good Samaritan University Hospital, West Islip, NY 11795, USA
| | - Jennifer Mceachron
- Division of Gynecologic Oncology, Good Samaritan University Hospital, West Islip, NY 11795, USA
| | - Christopher Atalla
- Division of Urology, Good Samaritan University Hospital, West Islip, NY 11795, USA
| | - Ashish Sangal
- Cancer Institute, Good Samaritan University Hospital, West Islip, NY 11795, USA
- Division of Hematology and Medical Oncology, Good Samaritan University Hospital, West Islip, NY 11795, USA
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4
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Dulaney C, Dover L. PROshot: SABR for Oligometastases, SABR for Renal Cell Carcinoma, Glioblastoma Multiforme Reirradiation, and Esophageal Squamous Cell Carcinoma. Pract Radiat Oncol 2023; 13:83-87. [PMID: 36868723 DOI: 10.1016/j.prro.2022.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/09/2022] [Accepted: 12/12/2022] [Indexed: 03/05/2023]
Affiliation(s)
- Caleb Dulaney
- Department of Radiation Oncology, Anderson Regional Health System, Meridian, Mississippi.
| | - Laura Dover
- Department of Radiation Oncology, Ascension St Vincent's East, Birmingham, Alabama
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5
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Eufemon Cereno R, Mou B, Baker S, Chng N, Arbour G, Bergman A, Liu M, Schellenberg D, Matthews Q, Huang V, Mestrovic A, Hyde D, Alexander A, Carolan H, Hsu F, Miller S, Atrchian S, Chan E, Ho C, Mohamed I, Lin A, Berrang T, Bang A, Jiang W, Lund C, Pai H, Valev B, Lefresne S, Tyldesley S, Olson RA. Should organs at risk (OARs) be prioritized over target volume coverage in stereotactic ablative radiotherapy (SABR) for oligometastases? a secondary analysis of the population-based phase II SABR-5 trial. Radiother Oncol 2023; 182:109576. [PMID: 36822355 DOI: 10.1016/j.radonc.2023.109576] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/26/2023] [Accepted: 02/12/2023] [Indexed: 02/23/2023]
Abstract
BACKGROUND AND PURPOSE Stereotactic ablative radiotherapy (SABR) for oligometastases may improve survival, however concerns about safety remain. To mitigate risk of toxicity, target coverage was sacrificed to prioritize organs-at-risk (OARs) during SABR planning in the population-based SABR-5 trial. This study evaluated the effect of this practice on dosimetry, local recurrence (LR), and progression-free survival (PFS). METHODS This single-arm phase II trial included patients with up to 5 oligometastases between November 2016 and July 2020. Theprotocol-specified planning objective was to cover 95 % of the planning target volume (PTV) with 100 % of the prescribed dose, however PTV coverage was reduced as needed to meet OAR constraints. This trade-off was measured using the coverage compromise index (CCI), computed as minimum dose received by the hottest 99 % of the PTV (D99) divided by the prescription dose. Under-coverage was defined as CCI < 0.90. The potential association between CCI and outcomes was evaluated. RESULTS 549 lesions from 381 patients were assessed. Mean CCI was 0.88 (95 % confidence interval [CI], 0.86-0.89), and 196 (36 %) lesions were under-covered. The highest mean CCI (0.95; 95 %CI, 0.93-0.97) was in non-spine bone lesions (n = 116), while the lowest mean CCI (0.71; 95 % CI, 0.69-0.73) was in spine lesions (n = 104). On multivariable analysis, under-coverage did not predict for worse LR (HR 0.48, p = 0.37) or PFS (HR 1.24, p = 0.38). Largest lesion diameter, colorectal and 'other' (non-prostate, breast, or lung) primary predicted for worse LR. Largest lesion diameter, synchronous tumor treatment, short disease free interval, state of oligoprogression, initiation or change in systemic treatment, and a high PTV Dmax were significantly associated with PFS. CONCLUSION PTV under-coverage was not associated with worse LR or PFS in this large, population-based phase II trial. Combined with low toxicity rates, this study supports the practice of prioritizing OAR constraints during oligometastatic SABR planning.
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Affiliation(s)
- Reno Eufemon Cereno
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Kelowna, British Columbia, Canada
| | - Benjamin Mou
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Kelowna, British Columbia, Canada
| | - Sarah Baker
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Surrey, British Columbia, Canada
| | - Nick Chng
- British Columbia Cancer, Prince George, British Columbia, Canada
| | - Gregory Arbour
- University of British Columbia, British Columbia, Canada
| | - Alanah Bergman
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Mitchell Liu
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Devin Schellenberg
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Surrey, British Columbia, Canada
| | - Quinn Matthews
- British Columbia Cancer, Prince George, British Columbia, Canada
| | - Vicky Huang
- British Columbia Cancer, Surrey, British Columbia, Canada
| | - Ante Mestrovic
- British Columbia Cancer, Victoria, British Columbia, Canada
| | - Derek Hyde
- British Columbia Cancer, Kelowna, British Columbia, Canada
| | - Abraham Alexander
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Victoria, British Columbia, Canada
| | - Hannah Carolan
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Fred Hsu
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Abbotsford, British Columbia, Canada
| | - Stacy Miller
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Prince George, British Columbia, Canada
| | - Siavash Atrchian
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Kelowna, British Columbia, Canada
| | - Elisa Chan
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Clement Ho
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Surrey, British Columbia, Canada
| | - Islam Mohamed
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Kelowna, British Columbia, Canada
| | - Angela Lin
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Kelowna, British Columbia, Canada
| | - Tanya Berrang
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Victoria, British Columbia, Canada
| | - Andrew Bang
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Will Jiang
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Prince George, British Columbia, Canada
| | - Chad Lund
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Surrey, British Columbia, Canada
| | - Howard Pai
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Victoria, British Columbia, Canada
| | - Boris Valev
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Victoria, British Columbia, Canada
| | - Shilo Lefresne
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Scott Tyldesley
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Vancouver, British Columbia, Canada
| | - Robert A Olson
- University of British Columbia, British Columbia, Canada; British Columbia Cancer, Prince George, British Columbia, Canada.
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