The Study
HPA axis function during adjunctive high-dose dexamethasone use in chemotherapy: a prospective pilot study.
This study watched how hormone levels changed in a small group of women getting cancer treatment with a strong steroid. It didn't find a clear pattern, so we can't say the steroid definitely caused the changes — it just shows what happened in these people.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
This study looked at whether the steroid medicine given before chemo to stop nausea might turn off the body's natural stress hormone (cortisol) over time.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 540 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Even when cortisol dipped low, it might just be stress or measurement noise—not true adrenal failure.
- 2You can't tell if someone's adrenal glands are truly suppressed just by checking one morning cortisol level.
- 3Cortisol levels went down a little for most women over 11 chemo cycles, but not enough to be sure it was real.
- 4One-third had cortisol drop below 150 nmol/L at some point, but it bounced back.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Frontiers in endocrinology
Year
2026
Authors
Elżbieta Turska, Krzysztof C. Lewandowski, Igor Symonowicz, Magdalena Kobus, Wojciech Horzelski, Tomasz Kubiatowski, Justyna Marchewka-Długońska, E. Kalinka
Related Content
Claims (5)
In women with breast cancer receiving paclitaxel chemotherapy, intermittent high-dose dexamethasone is associated with a non-significant decrease in morning cortisol and ACTH levels across 11 treatment cycles.
Patients starting with very high morning cortisol levels who receive dexamethasone-based chemotherapy show a larger decrease in cortisol over time than those starting with lower levels, but this difference is not statistically reliable.
Morning blood cortisol levels cannot reliably identify adrenal insufficiency caused by glucocorticoid treatment in cancer patients receiving chemotherapy because individual differences, stress responses, and changes in protein binding interfere with accurate measurement.
During dexamethasone chemotherapy, cortisol levels below 150 nmol/L often occur due to drug effects, measurement error, or stress, and do not necessarily mean the adrenal glands are not functioning properly.
In cancer patients taking intermittent high-dose dexamethasone, adrenal suppression can only be accurately measured using ACTH stimulation tests; morning cortisol levels alone are not precise enough.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.