Fatal methotrexate toxicity: could it have been avoided?

Area of Science:

• Oncology
• Pharmacology
• Genetics

Background:

• High-risk persistent trophoblastic disease requires careful treatment selection.
• Methotrexate is a standard chemotherapeutic agent, but its use requires caution.
• Single-agent methotrexate was chosen due to a patient's low-grade fever.

Observation:

• A young nulliparous woman received only three doses of methotrexate.
• The patient experienced severe, fatal toxicity before completing the first course.
• This outcome was unexpected and rare for methotrexate administration.

Findings:

• Severe methotrexate toxicity can occur even with limited dosing.
• Monitoring serum methotrexate levels could aid in managing hypersensitivity.
• Pharmacogenetic analysis may identify patients at risk for severe reactions.

Implications:

• The case highlights the potential for severe methotrexate toxicity.
• Serum level monitoring is crucial for patients with suspected hypersensitivity.
• Pharmacogenetics could personalize chemotherapy to mitigate risks, especially in resource-limited settings.