A critical and often overlooked factor in managing hyperglycemia is hydration. Volume depletion from drug-induced diarrhea impairs the kidneys' ability to excrete glucose. This traps sugar in the body, creating a vicious cycle that dramatically elevates blood glucose levels.

While known for weight loss, GLP-1 agonists are also highly effective for managing hyperglycemia from both steroids and PI3K inhibitors. Using low or "micro" doses can be very helpful in cancer patients, providing glucose control while minimizing GI side effects like nausea.

Advances in drug design mean newer PI3K inhibitors are more targeted, resulting in significantly less off-target toxicity. For example, some investigational agents have a hyperglycemia risk under 15%, a substantial improvement over earlier drugs, making them easier to manage clinically.

On-body glucose monitors give oncologists a richer understanding of a patient's glucose control, including 24-hour trends, time-in-range, and an A1c equivalent (GMI). This real-time data is critical for managing hyperglycemia from targeted therapies, offering more insight than periodic fasting tests.

A patient with normal baseline glucose on an AKT inhibitor can experience a sudden, severe spike in blood sugar when they get sick (e.g., fever, infection). The illness acts as a physiological stressor, creating a "perfect storm" that demands immediate attention and patient education.

A key eligibility criterion for the landmark EV-302 trial was glycemic control. Patients with an A1C above 8 were excluded due to hyperglycemia and diabetic ketoacidosis (DKA) risk from the enfortumab vedotin component. This has critical implications for patient selection and monitoring.

Oncologists typically initiate metformin for drug-induced hyperglycemia but are hesitant to manage more complex regimens. They prefer collaborating with endocrinologists who can navigate different drugs, dosages, and interactions, especially for complex oncology patients where frequent follow-up is needed.

For select patients who find frequent lab checks for hyperglycemia monitoring to be a significant barrier, a continuous glucose monitor (CGM) can be a practical alternative. While off-label, it provides valuable data for management in patients who might otherwise be non-adherent with monitoring.

Steroid-induced hyperglycemia is a primary driver of cancer-related high blood sugar. Patients with prediabetes (A1C 5.7-6.4%) are often overlooked but frequently develop hyperglycemia on high-dose dexamethasone, making proactive warnings and dietary guidance crucial for this group.