What is Doege-Potter Syndrome in Solitary Fibrous Tumor?

Yes, in some cases, a solitary fibrous tumor (SFT) can cause your blood sugar to drop dangerously low. This rare condition is known as Doege-Potter Syndrome. It happens when the tumor produces a hormone that mimics insulin, confusing your body’s blood sugar regulation. While these sudden drops can be frightening and dangerous, removing the tumor typically resolves the low blood sugar immediately.

What is Doege-Potter Syndrome?

Doege-Potter Syndrome is a type of paraneoplastic syndrome—a set of symptoms caused by a tumor’s abnormal chemical secretions rather than its physical growth ^[1].

In Doege-Potter Syndrome, the SFT produces an abnormal, oversized version of a hormone called Insulin-like Growth Factor-II (IGF-II), sometimes referred to as “big IGF-II” ^[1][2]. Normally, insulin is the main hormone responsible for lowering your blood sugar by helping cells absorb glucose (sugar) from your bloodstream. However, “big IGF-II” is so similar to insulin that it binds directly to your body’s insulin receptors ^[3].

This causes two major disruptions in your body:

1. Excessive glucose uptake: Your muscles and tissues rapidly absorb sugar from your blood, acting as if you had received a large, unexpected dose of insulin ^[1].
2. Reduced glucose production: It signals your liver to stop producing and releasing its natural sugar reserves ^[4].

The result is severe, unexpected drops in blood sugar (hypoglycemia), even if you do not have diabetes and your body’s natural insulin levels are actually very low ^[5].

Recognizing the Symptoms

Because the low blood sugar is driven by the tumor’s constant hormone production, episodes of hypoglycemia can happen at any time. However, they are often most noticeable after periods of fasting, such as first thing in the morning, or following physical exertion.

Symptoms of severe low blood sugar can include:

• Intense sweating and chills
• Dizziness, confusion, or difficulty concentrating
• A rapid heartbeat or feeling jittery
• Extreme fatigue or weakness
• In severe cases, fainting, seizures, or loss of consciousness

Immediate Action During an Episode

If you suspect your blood sugar is crashing, standard medical first-aid prioritizes immediate safety over getting to a doctor right away. The common approach is the “15-15 rule,” which involves consuming 15 grams of fast-acting carbohydrates—such as half a cup of fruit juice, regular soda, or glucose tablets—and checking symptoms again after 15 minutes. Treating the low blood sugar safely at home is critical before you attempt to drive or travel to a clinic.

To officially confirm Doege-Potter Syndrome, your care team will eventually need blood tests drawn during an episode of low blood sugar to measure your glucose, insulin, and IGF-II levels ^[3][6]. Because episodes often happen unpredictably at home, doctors frequently prescribe a Continuous Glucose Monitor (CGM) or a standard finger-prick meter to track levels, or they may advise going to an Emergency Department safely to capture the necessary lab work while symptoms are active.

Treatment and Resolution

The most effective and curative treatment for Doege-Potter Syndrome is the surgical removal of the solitary fibrous tumor ^[7]. Once the tumor is removed, the source of the abnormal IGF-II is eliminated. For most patients, normal blood sugar regulation is restored almost immediately after the surgery ^[8][9].

If the tumor cannot be removed right away, or if it is too advanced for surgery, your medical team will help you manage the hypoglycemia to keep you safe. Management strategies may include:

• Medical therapies: Medications like glucocorticoids (steroids) can help raise blood sugar levels and counteract the effects of the IGF-II hormone ^[10][11].
• Dietary management: Eating frequent meals or taking complex carbohydrates like uncooked cornstarch before bed can provide a slow, steady release of sugar through the night ^[12]. Keep fast-acting carbohydrates on your nightstand for emergencies.
• Tumor-directed therapies: Treatments designed to shrink the tumor or cut off its blood supply, such as embolization, can reduce the overall amount of IGF-II the tumor is able to produce ^[13].

Finally, many patients find it helpful to wear a medical alert bracelet. This ensures that if you lose consciousness, emergency responders immediately know to check and treat your blood sugar. Even after successful surgery, long-term follow-up is important. If the solitary fibrous tumor ever returns, recurrent blood sugar drops can serve as an early warning sign ^[14][15].