Siavash Atrchian, MD FRCPC

Clinical Assistant Professor
Division of Radiation Oncology and Developmental Radiotherapeutics
UBC Department of Surgery

Active Staff, Radiation Oncologist
Department of Radiation Oncology
BC Cancer – Kelowna

BC Cancer – Kelowna
Sindi Ahluwalia Hawkins Centre for the Southern Interior
399 Royal Avenue
Kelowna BC V1Y 5L3

Phone: 250.979.6645
Fax: 250.712.3911

Special Interests

  • SABR (Stereotactic Ablative Radiotherapy)
  • Treatment of Lung, Breast and GI Malignancies
  • Role of Microbiome in Cancer Development
  • Cancer Care improvements and outcomes

Selected Publications and Abstracts

Baker S, Jiang W, Mou B, Lund C, Liu M, Bergman A, Schellenberg D, Alexander A, Carolan H, Atrchian S, Chng N, Matthews Q, Arbour G, Benny A, Tyldesley S, Olson R Progression-Free Survival and Local Control After SABR for up to 5 Oligometastases: An Analysis from the Population-Based Phase 2 SABR-5 Trial
Int J Radiat Oncol Biol Phys. 2022 Jun 3:S0360-3016(22)00542-9.doi: 10.1016/j.ijrobp.2022.05.033

Baker S, Mou B, Jiang W, Liu M, Bergman A, Schellenberg D, Alexander A, Carolan H, Atrchian S, Berrang T, Bang A, Chng N, Matthews Q, Tyldesley S, Olson R
Predictors of Early Polymetastatic Relapse After SABR for up to 5 Oligometastases: A Secondary Analysis of the Phase 2 SABR-5 Trial
Int J Radiat Oncol Biol Phys. 2022Jul 13:S0360-3016(22)00708-8. doi: 10.1016/j.ijrobp.2022.06.094

Baker S, Mou B, Jiang W, Liu M, Bergman A, Schellenberg D, Alexander A, Carolan H,  Atrchian S, Berrang T, Bang A, Chng N, Matthews Q, Tyldesley S, Olson R
Validation of the prognostic utility of ESTRO/EORTC oligometastatic disease classification: A secondary analysis from the population-based phase II SABR-5 Trial
Int J Radiat Oncol Biol Phys. 2022

Wong J, Huang V, Giambattista J, Teke T, Kolbeck C, Giambattista J,  Atrchian S
Training and Validation of Deep Learning-Based Auto-Segmentation Models for Lung Stereotactic Ablative Radiotherapy Using Retrospective Radiotherapy Planning Contours
Frontiers in Oncology, 07 June 2021

Lin T, Atrchian S, Humer M, Siever J, Lin A
Clinical Outcomes of Pancoast Tumors Treated with Trimodality Therapy
Journal of Thoracic Disease, 2021 Jun;13 (6):3529-3538. doi: 10.21037/jtd-21-380

Murchison S, DeVries K, Atrchian S
Patient Outcomes with Dose Escalation Using Modern Radiotherapy Techniques: A Retrospective Review of Anal Cancer Treated at a Large Academic Institution Between 2010-16
Cureus. 2020 Oct 16;12(10): e10989. doi: 10.7759/cureus.10989

Chen J, Douglass J, Prasath V, Neace M, Atrchian S, Manjili MH, Shokouhi S, Habibi M
The microbiome and breast cancer: A review
Breast Cancer Res Treat. 2019 Dec; 178(3):493-496. doi: 10.1007/s10549-019-05407-5. Epub 2019 Aug 27

Atrchian S, Sadeghi P, Cwajna W, Helyer L, Rheaume D, Nolan M, Sadeghi P, Rutledge R, Calverley V, Bennet S, Robar J
Improvement of Consistency in Delineation Breast Lumpectomy Cavity Using Surgical Clips
J Surg Res. 2018 Jan; 221:30-34. doi: 10.1016/j.jss.2017.07.033

Wu E, Sit D, Derocher H, Lin T, Lin A, Sauciuc D, Murchison S, Siever J, Atrchian S
A British Columbia based population study on the treatment and long-term outcomes of Thymoma: A 25-Year Retrospective Review
ASTRO 2022, San Antonio, USA, CARO 2022, Toronto, Canada

Sit D, Vojnits K, Yang H, Chen K, Zhao B, Rao S, Lee L, Davies J, Yang H, Pakpour S, Atrchian S
High-quality DNA extraction and gut microbial detection to evaluate pathologic response following neoadjuvant treatment for locally advanced rectal cancer
CARO 2022, Toronto, Canada

Atrchian S, Darud M, Chow S, Ito C, Ponte K, Lali, A
Improving No-Show rates at BC Cancer – Kelowna using SMS reminders
International Forum on Quality and Safety in Healthcare 2022, Gothenburg, Sweden

Robert Olson, W Jiang, M Liu, A Bergman, D Schellenberg, B Mou, A Alexander, H Carolan, F Hsu, S Miller, S Atrchian, E Chan, C Ho, I Mohamed, A Lin, T Berrang, A Bang, N Chng, Q Matthews, V Huang, A Mestrovic, D Hyde, C Lund, H Pai, B Valev, S Lefresne, S Tyldesley
Population-based phase II trial of SABR for up to 5 Oligometastases: Preliminary Results of the SABR-5 trial
ASTRO 2021, Chicago, USA

Atrchian S, Lin A, Lucas S, Rajapakshe R, Lali A, Germain F
Adjuvant Radiation Treatment Using High Tangent Technique in Breast Carcinomas: Review of Our Experience at BC Cancer Kelowna
CARO 2020, Toronto, Canada, ASTRO 2020, Miami, USA

Mou B, McGregor S, Baliski C, Atrchian S, Lucas S, Lin A, Germain F, Mohamed I
Wait times for adjuvant breast radiotherapy in the British Columbia Southern Interior
CARO 2017, Toronto, Canada

Atrchian S, Hsu F, Badragan I, Yu R
Supine vs. Prone positioning on reproducibility and acute toxicity for rectal cancer
CARO 2013, Montreal, Canada

Atrchian S, Hollenhorst H, Wilke D, Rajaraman M
Intensity Modulated Radiation Therapy (IMRT) versus Chemo-IMRT in the treatment of stage III-IV Pharyngeal carcinoma: A retrospective study at the Nova Scotia Cancer Center
CARO 2009, Quebec City, Canada