Dr. Steven Tisseverasinghe – Oncologist / Hematologist | Gatineau, QC

Dr. Steven Tisseverasinghe, a Radiation Oncologist, utilizes advanced radiation therapies to treat various forms of cancer, working as part of a multidisciplinary team. Practicing at Hôpital de Gatineau in Gatineau, QC, he is part of a dedicated healthcare team committed to providing comprehensive cancer care. His practice adheres to the high standards set by the Collège des médecins du Québec (CMQ), ensuring quality and safety in all aspects of patient care. Dr. Tisseverasinghe's expertise includes the precise planning and delivery of radiation therapy for a variety of cancer types, aiming to maximize treatment efficacy while minimizing side effects. His focus is on helping adult patients with suspected or diagnosed cancers or blood disorders, offering access to state-of-the-art diagnostic and therapeutic facilities within a supportive environment.

He graduated with a Medical Degree in 2017 and has been practicing as a Radiation Oncologist for over 7 years. Dr. Tisseverasinghe completed extensive postgraduate medical training and certification in Radiation Oncology, specializing in cancer treatment with radiation. His training ensures he is well-equipped with the latest techniques and evidence-based practices to deliver optimal patient outcomes.

Dr. Tisseverasinghe is dedicated to providing multidisciplinary, patient-centered care, combining the latest research and clinical guidelines. He is committed to supporting his patients and their families throughout their treatment journey. Fluent in French, he offers consultations and communication in both official languages of Quebec, ensuring clear understanding and compassionate care for his diverse patient population.

Dr. Steven Tisseverasinghe has expertise in managing a wide range of conditions, including:

Common Cancers (Solid Tumors) Treated

• Lung Cancer (Non-Small Cell & Small Cell): Cancers originating in the lungs, treated with chemotherapy, targeted therapy, immunotherapy, and/or radiation based on type and stage.
• Prostate Cancer: Cancer developing in the prostate gland in men, with treatment options including hormone therapy, chemotherapy, radiation, or active surveillance.
• 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.

Hematologic Malignancies (Blood Cancers) Treated

• Myelodysplastic Syndromes (MDS): A group of diverse bone marrow disorders in which the bone marrow does not produce enough healthy, mature blood cells.
• Non-Hodgkin Lymphoma (NHL) (e.g., Diffuse Large B-Cell, Follicular, Mantle Cell): A diverse group of blood cancers that develop from lymphocytes, with many different subtypes requiring tailored treatments.
• Multiple Myeloma: A cancer of plasma cells, a type of white blood cell in the bone marrow that produces antibodies, leading to bone damage and other complications.

Common Areas/Cancers Treated with Radiation Oncology

• Lymphomas & Hematologic Malignancies (Radiation Role): Utilizing radiation therapy in specific situations for Hodgkin and Non-Hodgkin lymphomas, or for conditioning before stem cell transplant.
• 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.
• Head & Neck Cancers (e.g., Laryngeal, Pharyngeal, Oral Cavity): Utilizing radiation therapy as a primary treatment, or in conjunction with surgery and/or chemotherapy for cancers of the head and neck region.

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. Steven Tisseverasinghe or your referring physician.

• 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.
• Second Opinion Consultations for Cancer & Blood Disorders: Providing expert second opinions on complex diagnoses and proposed treatment plans to ensure informed decision-making.
• Performance Status Assessment & Treatment Eligibility Evaluation: Evaluating a patient's overall fitness and ability to tolerate specific anti-cancer treatments.
• Comprehensive Oncologic & Hematologic Consultation: In-depth evaluation of medical history, review of diagnostic imaging and pathology, cancer staging (if applicable), and development of personalized treatment plans for various cancers and blood disorders.
• 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.
• Palliative Radiation Therapy for Symptom Control: Using radiation to alleviate pain, bleeding, or obstruction caused by cancer.
• 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.

Note: This list provides a general overview of services offered in Radiation Oncology (Cancer Treatment with Radiation). Treatment plans are highly individualized. Dr. Tisseverasinghe provides a wide array of diagnostic, therapeutic, and supportive care options tailored to each patient's specific condition and needs. Please discuss with Dr. Tisseverasinghe 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 Collège des médecins du Québec (CMQ) and relevant cancer care guidelines. A referral is required.

Hôpital de Gatineau is situated in the Gatineau Sector East (Pointe-Gatineau, Le Baron) neighborhood of Gatineau, QC. The hospital is conveniently accessible via the Commercial Corridor (Hull) and is well-served by public transit, including the Société de transport de l'Outaouais (STO), which includes the Rapibus BRT system. The facility is wheelchair accessible, ensuring ease of access for all patients. Parking is available on-site for visitors and patients, making it convenient to attend appointments and treatments in a comfortable setting.

Are consultations and treatments with Dr. Tisseverasinghe, an Radiation Oncologist, covered by Régie de l'assurance maladie du Québec (RAMQ) in QC?

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. Tisseverasinghe are generally covered by Régie de l'assurance maladie du Québec (RAMQ) in QC 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 Régie de l'assurance maladie du Québec (RAMQ), Dr. Tisseverasinghe'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. Tisseverasinghe, an Radiation Oncologist?

Yes, a referral from your family physician or another specialist is almost always required to see an Radiation Oncologist like Dr. Tisseverasinghe 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.

Why might I need a bone marrow biopsy, and what does it involve if Dr. Tisseverasinghe recommends it?

A bone marrow biopsy and aspiration are procedures used to collect and examine bone marrow, the soft tissue inside your bones where blood cells are made. Dr. Tisseverasinghe might recommend this test to diagnose or monitor various blood disorders, including leukemias, lymphomas, myeloma, anemias, or infections. The procedure is usually done on the back of the hip bone under local anesthesia. A needle is used to withdraw a small sample of liquid marrow (aspiration) and a small core of bone marrow tissue (biopsy). You may feel some pressure or brief pain.

Does a Hematologist only treat blood cancers?

No, Hematologists treat a wide range of blood disorders, not just cancers. This includes benign (non-cancerous) conditions such as various types of anemia (e.g., iron deficiency anemia, vitamin B12 deficiency, sickle cell anemia, thalassemia), bleeding disorders (like hemophilia or von Willebrand disease), clotting disorders (thrombophilia, deep vein thrombosis, pulmonary embolism), and issues with white blood cells (like neutropenia) or platelets (like ITP). Dr. Tisseverasinghe, if focused on hematology, can diagnose and manage these conditions.

What is targeted therapy in cancer treatment?

Targeted therapy uses drugs or other substances to identify and attack specific types of cancer cells with less harm to normal cells. These therapies work by targeting specific genes or proteins found in cancer cells or cells related to cancer growth, like blood vessel cells. Genetic testing of the tumor is often done to see if a targeted therapy is likely to be effective. Dr. Tisseverasinghe can explain if targeted therapy is an option for your cancer.

What are common side effects of chemotherapy, and how does Dr. Tisseverasinghe help manage them?

Chemotherapy can cause various side effects, which differ depending on the specific drugs used, the dose, and individual patient factors. Common ones include fatigue, nausea, vomiting, hair loss, mouth sores, changes in appetite, diarrhea or constipation, and increased risk of infection due to low blood counts. Dr. Tisseverasinghe and the oncology nursing team will discuss potential side effects of your specific treatment plan in detail and will actively work to prevent and manage them with medications (e.g., anti-nausea drugs, growth factors to boost blood counts), supportive care advice (nutrition, hydration, rest), and regular monitoring. Open communication about any side effects you experience is very important for effective management.

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

Cancer care and complex hematology care often involve a multidisciplinary team (MDT) of specialists working together. This team may include medical oncologists like Dr. Tisseverasinghe, 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. Tisseverasinghe works collaboratively within this team to ensure you receive holistic and well-managed care.

Hôpital de Gatineau
909 boul La Verendrye O
Gatineau, QC J8P 7H2

Phone: (819) 966-6100

The facility is wheelchair accessible.

Dr. Tisseverasinghe is a licensed Radiation Oncologist regulated by the Collège des médecins du Québec (CMQ) under the Medical Act in QC. 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 Collège des médecins du Québec (CMQ): https://www.cmq.org/en/directory/physicians?number=17617