Dr. Christiaan Simeon Michael Stevens – Oncologist / Hematologist | Barrie, ON

Dr. Christiaan Simeon Michael Stevens, a Radiation Oncologist, utilizes advanced radiation therapies to treat various forms of cancer, working as part of a multidisciplinary team. Practicing at St. Michael's Hospital in Barrie, ON, he is part of a dedicated healthcare team committed to providing compassionate and effective cancer care. His approach emphasizes patient-centered treatment, ensuring that each individual receives personalized plans tailored to their specific diagnosis and needs. Dr. Stevens's practice adheres to the highest standards set by the College of Physicians and Surgeons of Ontario (CPSO), maintaining rigorous quality and safety protocols. His expertise includes the precise planning and delivery of radiation therapy for a variety of cancer types, aiming to maximize treatment effectiveness while minimizing side effects.

He graduated with a Medical Degree from the University of Toronto in 2003 and has been practicing as a Radiation Oncologist for over 16 years since 2008. Dr. Stevens is certified as a RCPSC Specialist in Radiation Oncology, reflecting his specialized training and commitment to excellence in cancer treatment with radiation. His continuous professional development ensures that he stays current with emerging technologies and evidence-based practices in radiation oncology, providing patients access to the latest treatment options.

Driven by a philosophy of multidisciplinary collaboration, Dr. Stevens is dedicated to delivering evidence-based care with a compassionate approach. He believes in empowering patients through education and shared decision-making, supporting patients and their families throughout their cancer journey. Fluent in English and French, he strives to communicate clearly and empathetically, fostering trust and comfort in his practice. His commitment extends beyond treatment, aiming to improve quality of life and hope for every patient he serves in Barrie and the surrounding communities.

Dr. Christiaan Stevens has expertise in managing a wide range of conditions, including:

Hematologic Malignancies (Blood Cancers) Treated

• Waldenström's Macroglobulinemia: A rare type of non-Hodgkin lymphoma characterized by an overproduction of a protein called macroglobulin.
• Chronic Lymphocytic Leukemia (CLL) / Small Lymphocytic Lymphoma (SLL): A type of cancer that starts from white blood cells (lymphocytes) in the bone marrow, typically slow-growing.
• Chronic Myeloid Leukemia (CML): A type of cancer that starts in certain blood-forming cells of the bone marrow, often managed with targeted therapies.

Common Cancers (Solid Tumors) Treated

• Sarcomas (Bone & Soft Tissue - Systemic Therapy): Rare cancers arising from connective tissues, where medical oncologists administer chemotherapy or targeted therapies for advanced or metastatic disease.
• Brain & Central Nervous System (CNS) Tumors (Primary & Metastatic - Medical Oncology aspects): Malignant tumors of the brain and spinal cord, where medical oncologists may manage chemotherapy or targeted therapies as part of a multidisciplinary team.
• Colorectal Cancer (Colon & Rectal Cancer): Cancer that starts in the colon or rectum, often managed with surgery, chemotherapy, radiation (for rectal), and targeted therapies.

Common Areas/Cancers Treated with Radiation Oncology

• Gynecologic Cancers (e.g., Cervical, Uterine, Vaginal, Vulvar - Radiation Aspects): Application of external beam radiation and/or brachytherapy for cancers of the female reproductive tract.
• Breast Cancer (Adjuvant, Neoadjuvant, Palliative Radiation): Applying radiation after lumpectomy or mastectomy to reduce recurrence risk, or to treat metastatic disease.
• Thoracic Cancers (e.g., Lung Cancer, Esophageal Cancer, Mesothelioma): Using radiation therapy to treat cancers within the chest cavity, often combined with other modalities.

This list provides examples of common conditions treated and is not exhaustive. Cancer and blood disorders are complex, and treatment is highly individualized. For personalized advice, please discuss your specific situation with Dr. Christiaan Stevens or your referring physician.

• External Beam Radiation Therapy (EBRT) - 3D Conformal, IMRT, VMAT: Developing precise, individualized plans for delivering radiation using external machines (e.g., linear accelerators) with techniques like Intensity-Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT).
• Stereotactic Body Radiotherapy (SBRT) / Stereotactic Ablative Radiotherapy (SABR) / Stereotactic Radiosurgery (SRS): Delivering highly focused, high-dose radiation to precisely targeted tumors or lesions in the brain or body, often in a few treatment sessions.
• Image-Guided Radiation Therapy (IGRT): Utilizing advanced imaging during treatment delivery to precisely target tumors and adapt to changes, while minimizing exposure to healthy tissues.
• Palliative Radiation Therapy for Symptom Control: Using radiation to alleviate pain, bleeding, or obstruction caused by cancer.
• Performance Status Assessment & Treatment Eligibility Evaluation: Evaluating a patient's overall fitness and ability to tolerate specific anti-cancer treatments.
• Total Body Irradiation (TBI) - Component of Stem Cell Transplant Regimens: Radiation therapy delivered to the entire body, often used as part of the conditioning regimen before a bone marrow or stem cell transplant.
• Brachytherapy (Internal Radiation - LDR/HDR) for Specific Cancers: Planning and performing procedures where radioactive sources are placed directly into or near a tumor (e.g., for prostate, cervical, breast cancer).

Note: This list provides a general overview of services offered in Radiation Oncology (Cancer Treatment with Radiation). Treatment plans are highly individualized. Dr. Stevens provides a wide array of diagnostic, therapeutic, and supportive care options tailored to each patient's specific condition and needs. Please discuss with Dr. Stevens or your healthcare team for details relevant to your care.

All medical services and treatments are provided in accordance with the standards of practice set by the College of Physicians and Surgeons of Ontario (CPSO) and relevant cancer care guidelines. A referral is required.

Dr. Stevens practices primarily at St. Michael's Hospital located in the vibrant Downtown Barrie, in the East Bayfield neighborhood. The hospital is conveniently situated near landmarks such as North Barrie Crossing and is easily accessible via public transit, including Barrie Transit. The facility is wheelchair accessible, ensuring ease of access for all patients. Paid parking options are close by, providing convenient options for those arriving by car. The location offers state-of-the-art diagnostic and treatment facilities, supporting comprehensive and compassionate cancer care for adults with suspected or diagnosed cancer or blood disorders in Barrie and surrounding communities.

Are consultations and treatments with Dr. Stevens, an Radiation Oncologist, covered by Ontario Health Insurance Plan (OHIP) in ON?

Medically necessary consultations, diagnostic tests (like biopsies, imaging reviews), chemotherapy, immunotherapy, targeted therapies, radiation therapy planning and delivery, and management of blood disorders by a licensed Radiation Oncologist such as Dr. Stevens are generally covered by Ontario Health Insurance Plan (OHIP) in ON when a referral from a family doctor or another specialist is in place. Specific drug coverage for newer therapies can vary by provincial formularies and may require special authorization. It's always recommended to discuss coverage specifics with Ontario Health Insurance Plan (OHIP), Dr. Stevens's office, the hospital's patient financial services, or the cancer care navigation services at the treatment facility.

Do I need a referral to see Dr. Stevens, an Radiation Oncologist?

Yes, a referral from your family physician or another specialist is almost always required to see an Radiation Oncologist like Dr. Stevens for assessment or treatment of cancer or significant hematological conditions. This ensures that your primary care provider is involved in your care continuum and that you are directed to the most appropriate specialist for your specific situation. Cancer care programs often have centralized intake systems that manage referrals to ensure timely access.

How is cancer care typically coordinated when seeing Dr. Stevens?

Cancer care and complex hematology care often involve a multidisciplinary team (MDT) of specialists working together. This team may include medical oncologists like Dr. Stevens, surgeons, radiation oncologists, pathologists, radiologists, specialized oncology nurses, pharmacists, social workers, dietitians, genetic counselors, and palliative care specialists. Regular team meetings (often called tumor boards or MDT meetings) usually occur to discuss individual patient cases and develop comprehensive, coordinated treatment plans. Dr. Stevens works collaboratively within this team to ensure you receive holistic and well-managed care.

What is Radiation Oncology and when is it used?

Radiation Oncology is a medical specialty that uses high-energy radiation (like X-rays, gamma rays, or charged particles) to damage or destroy cancer cells and shrink tumors. It can be used as a primary treatment, before surgery (neoadjuvant), after surgery (adjuvant), or in combination with chemotherapy. It can also be used for palliative care to relieve symptoms. Dr. Stevens specializes in planning and delivering radiation therapy using techniques like EBRT, IMRT, SBRT, or brachytherapy. If your cancer type is best managed with radiation, he will develop a tailored treatment plan to optimize outcomes.

What is palliative care, and when might Dr. Stevens discuss it?

Palliative care is specialized medical care focused on providing relief from the symptoms and stress of a serious illness, like cancer or advanced blood disorders. The goal is to improve quality of life for both the patient and the family. It can be provided at any stage of illness, alongside curative treatments, not just at the end of life. Dr. Stevens may discuss palliative care if you are experiencing significant symptoms, to help manage pain, fatigue, nausea, anxiety, or other issues, and to provide an extra layer of support.

How does cancer or blood disorder treatment differ for children compared to adults?

[If provider is pediatric specialist:] As a Pediatric Hematologist/Oncologist, Dr. Stevens specializes in these differences. Children's bodies react differently to treatments, and the types of cancers and blood disorders are often distinct from adult conditions. Treatment protocols are specifically designed for pediatric patients, considering their growth and development. Care is family-centered, involving parents and caregivers closely in decision-making and support. [Else:] Treatment for children with cancer or blood disorders is highly specialized and managed by Pediatric Hematologists/Oncologists. They use protocols tailored to children, considering long-term effects on growth and development.

St. Michael's Hospital
201 Georgian Drive, Department of Pathology and Laborat
Barrie, ON L4M 6M2

Phone: (705) 728-9090 | Fax: (705) 739-5619

The facility is wheelchair accessible.

Dr. Stevens is a licensed Radiation Oncologist regulated by the College of Physicians and Surgeons of Ontario (CPSO) under the Regulated Health Professions Act, 1991 and Medicine Act, 1991 in ON. A referral from a family physician or other specialist is required for most consultations and treatments under the provincial health plan.

Verify registration with the College of Physicians and Surgeons of Ontario (CPSO): https://doctors.cpso.on.ca/DoctorDetails/Stevens-Christiaan-Simeon-Michael/0201425-79473