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Updated: Sep 1, 2025

Human Liver Microphysiological System for Assessing Drug-Induced Liver Toxicity In Vitro
Published on: January 31, 2022
ALPELISIB - INDUCED HYPERGLYCEMIA
P S Ekanayake1,2, J Gerwer1,2, K Mccowen1
1University of California San Diego - Division of Endocrinology, Diabetes and Metabolism, La Jolla, California, United States.
New PI3K inhibitors like alpelisib can cause severe hyperglycemia in breast cancer patients. This on-target side effect requires careful management, as insulin therapy may be needed to control blood glucose levels.
Area of Science:
- Oncology
- Endocrinology
- Pharmacology
Background:
- Phosphoinositide-3-kinase (PI3K) pathway inhibitors are emerging as targeted therapies for various malignancies.
- Hyperglycemia is a known on-target side effect of PI3K inhibitors due to their role in insulin signaling.
Observation:
- This case series examines three women with HR+, Her2- PI3K-mutated breast cancer who developed severe hyperglycemia after starting alpelisib.
- The hyperglycemia was noted to be new onset and severe in all three patients.
- In one case, hyperglycemia resolved within a week of discontinuing alpelisib.
Findings:
- Alpelisib, a PI3K inhibitor, can induce significant hyperglycemia, even in patients without pre-existing diabetes.
- The severity of hyperglycemia may necessitate treatment interruption or dose adjustment.
- Management strategies for PI3K inhibitor-induced hyperglycemia are still being established.
Implications:
- Understanding the mechanism and management of PI3K inhibitor-induced hyperglycemia is crucial for optimizing cancer treatment.
- Further research is needed to clarify the optimal glucose-lowering strategies, including the role of exogenous insulin.
- This highlights the importance of close monitoring for metabolic side effects in patients receiving PI3K pathway inhibitors.
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