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Centre intégré universitaire de santé
et de services sociaux de l'Est-de-l'Île-de-Montréal

Centre intégré universitaire de santé et de services sociaux de l'Est-de-l'Île-de-Montréal

Michael Yassa

Michael Yassa

Clinical Assistant Professor


Université de Montréal

Research Axes

Clinical research

Contact information

Dr. Yassa's practice and research focus mainly on radiation therapy for breast and prostate cancer, with an emphasis on alternative radiation therapy delivery methods to improve quality of care and quality of life.

  • Yassa M, Bahary JP, Bourguoin P, Belair M, Berthelet F, Bouthillier A. “Intra-parenchymal mesenchymal chondrosarcoma of the cerebellum: case report and review of the literature”. Journal of Neuro-Oncology. 2005; 74(3):329-31.
  • Yassa M, Fortin B, Lambert C, Fortin MA, Nguyen TV, Bahary JP. “Combined hypofractionated radiation and hormone therapy for the treatment of intermediate-risk prostate cancer”. International Journal of Radiation Oncology, Biology, Physics. 2008; 71(1):58-63.
  • Dejean C, Kantor G, Henriques Figueiredo B, Lisbona A, Mahé MA, Mervoyer A, Zefkili S, Yassa M, Giraud P. “Tomothérapie hélicoïdale : aspects techniques et applications cliniques” Bulletin du Cancer. 2010; 7:783-9.
  • Yassa M, Saliou M, De Rycke Y, Hemery C, Henni M, Bachaud J, Thiounn N, Cosset JM, Giraud P. “Male pattern baldness and the risk of prostate cancer”. Annals of Oncology. 2011;22(8):1824-7.
  • Giraud P, Kantor G, Yassa M, Zefkili S, Dejean C, Lisbona A, Campana F, Mahé MA. “Two-year clinical experience with tomotherapy: the french national cancer institute project on implementing new technology”. Cancer Investigation. 2011; 29(8):557-63.
  • Sylvestre A, Mahé MA, Lisbona A, Zefkili S, Savignoni A, Bonnette P, Barthes FL, Paris E, Perigaud C, Yassa M, Giraud P. “Mesothelioma at era of helical tomotherapy: Results of two institutions in combining chemotherapy, surgery and radiotherapy”. Lung Cancer. 2011;74(3):486-91.
  • Yassa M, Hijal T, Giraud P. “Prostate cancer and androgenic alopecia”. Expert Review of Endocrinology and Metabolism. 2012; 7(2):169-173.
  • Vavassis P, Nguyen DH, Bahary JP, Yassa M. “Hypofractionated radiotherapy in prostate cancer”. Expert Review in Anticancer Therapy. 2012; 12(7):965-72.
  • Yassa M, Vavassis P, Niazi T. “Whole-pelvic radiation therapy in the context of hypofractionation for high-risk prostate cancer patients: a step forward. In regard to Kaidar-Person et al.” International Journal of Radiation Oncology, Biology, Physics. 2013;87(4):634-5.
  • Hathout L, Hijal T, Théberge V, Fortin B, Vulpe H, Hogue JC, Lambert C, Bahig H, Provencher L, Vavassis P, Yassa M. “Hypofractionated radiotherapy for breast ductal carcinoma in situ”. International Journal of Radiation Oncology, Biology, Physics. 2013;87(5):1058-63.
  • Fawaz ZS, Yassa M, Nguyen DH, Vavassis P. “Implantation de marqueurs fiduciels intraprostatiques avant radiothérapie : taux de complications et technique”. Cancer Radiotherapie. 2014;18(8):736-9.
  • Bahig H, Roussin É, Yassa M, Vavassis P, Lemaire C, Archambault L, Nguyen DH. “Partial kilovoltage cone beam computed tomography, complete kilovoltage cone beam computed tomography, and electronic portal images for breast radiation therapy: A dose-comparison study”. Practical Radiation Oncology. 2015;5(5):e521-9.
  • Tiberi D, Hijal T, Yassa M. “Radiothérapie externe hypofractionnée du cancer du sein localisé : où en est-on ? ”. Cancer Radiotherapie. 2015;19(6-7):426-30.
  • Moran MS, Zhao Y, Ma S, Kirova YM, Fourquet A, Chen PY, Hoffman KE, Hunt KK, Wong JS, Halasz L, Freedman GM, Prosnitz R, Yassa M, Nguyen DH, Hijal T, Haffty BG, Wai ES, Truong P. “The benefit of radiation therapy boost for ductal carcinoma in situ (DCIS) after whole breast radiation therapy: Analysis of outcomes from ten pooled academic institutions”. JAMA Oncology. 2017;3(8):1060-68.
  • Tiberi D, Vavassis P, Nguyen DH, Yassa M. “Hypofractionated radiotherapy for high-risk prostate cancer: an update”
    Expert Review of Endocrinology and Metabolism. 2017;12(3):199-205. **Auteur principal.


  • MD CM

    McGill University

  • Residency in radiation oncology

    Université de Montréal

  • Fellowship

    Hôpital Européen Georges Pompidou