The Toronto Protocol: Your Roadmap for Surveillance

The foundation of living well with Li-Fraumeni Syndrome (LFS) is a proactive approach to health called the Toronto Protocol ^[1]. This intensive surveillance program is designed to move away from “reactive” medicine—treating cancer after symptoms appear—and toward “proactive” medicine, catching changes when they are most treatable ^[2].

The Gold Standard: Whole-Body MRI (WB-MRI)

The centerpiece of LFS surveillance is the Whole-Body MRI (WB-MRI) ^[2][1].

• No Radiation: Unlike CT scans, an MRI uses magnets and radio waves rather than ionizing radiation ^[2]. This is essential because LFS cells are naturally more sensitive to radiation-induced damage ^[3][4].
• Early Detection: Studies show that WB-MRI frequently identifies cancers at such an early stage that they can be treated with surgery alone, often avoiding chemotherapy ^[1].

The Surveillance Schedule

While your doctor will personalize your plan, the standard protocol generally follows these milestones:

For Children (Birth to Age 18)

• Clinical Exams: Complete physical exams every 3–4 months ^[1].
• Abdominal Ultrasound: Every 3–4 months to check the adrenal glands and liver ^[1].
• Annual WB-MRI and Brain MRI: Starting in early childhood ^[1].
• Annual Dermatological Exam: To check for skin cancers, given the body’s reduced ability to repair DNA from sun damage ^[3].

For Adults (Age 18+)

• Annual WB-MRI and Brain MRI: Continuing throughout adulthood ^[1].
• Breast Screening (for Women): Starting at age 20, women undergo a Breast MRI every year ^[5]. Mammograms are avoided due to radiation risk ^[4].
• Colonoscopy & Upper Endoscopy: Starting at age 25, repeated every 2–5 years ^[6][7].
• Annual Dermatological Exam: Just as in childhood, yearly skin checks are vital ^[3].

A Nuanced Approach to Blood Tests

In the past, adult surveillance guidelines included frequent routine blood tests for tumor markers. While many adult guidelines have de-emphasized general blood markers in favor of high-sensitivity MRI imaging ^[8], blood tests remain an absolutely critical part of pediatric screening. For children, routine blood work (such as CBCs and specific hormone panels) is strictly required every 3-4 months to monitor for leukemias and adrenocortical carcinoma (ACC) ^[1]. Parents should never skip these vital blood screenings for their children.

Managing “Scanxiety”

It is completely normal to feel intense worry before and after a scan—often called scanxiety ^[9].

• Symptom Journal: Consider keeping a “symptom journal” between scans. Documenting how you feel can help you regain a sense of control and make it easier to differentiate between normal daily aches and persistent symptoms that warrant a call to your doctor.
• Rapid Results: Ask your care team for a “rapid result delivery” plan to minimize the waiting period ^[10].

Remember: A scan that finds something is a success of the protocol—it means the system worked to give you the best possible chance.