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Testolactone-associated high androgen levels, a pharmacologic effect or a laboratory artifact?
E A Cummings1, S R Salisbury, M L Givner
1Department of Pediatrics, IWK Grace Health Centre, Halifax, Nova Scotia, Canada.
The Journal of Clinical Endocrinology and Metabolism
|March 20, 1998
Summary
Testolactone, an aromatase inhibitor, can interfere with radioimmunoassays (RIAs) for testosterone and androstenedione. This interference makes these tests unreliable for monitoring patients undergoing testolactone treatment for precocious puberty.
Area of Science:
- Endocrinology
- Pharmacology
- Clinical Chemistry
Background:
- Testolactone is an aromatase inhibitor used to manage precocious puberty.
- It functions by blocking the conversion of androgens to estrogens.
- Similar responses to testolactone have been observed in girls with McCune-Albright syndrome and familial male precocious puberty.
Observation:
- Patients treated with testolactone exhibited elevated serum androstenedione and testosterone levels.
- These elevations were investigated for potential interference with radioimmunoassays (RIAs).
- Serial measurements after testolactone administration showed transient, significant increases in both androstenedione and testosterone.
Findings:
- Testolactone demonstrated cross-reactivity in the testosterone RIA.
- The drug significantly interferes with serum testosterone and androstenedione RIAs.
- These findings indicate that RIA results for these hormones are unreliable during testolactone therapy.
Implications:
- The use of standard RIAs for monitoring testosterone and androstenedione is not recommended in patients treated with testolactone.
- Alternative or modified assay methods may be necessary for accurate patient follow-up.
- This interference has critical implications for assessing treatment efficacy and hormonal status in patients with precocious puberty or other conditions managed with testolactone.
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