Study record
Nandrolone in telomeropathies: telomere elongation and clinical outcome in a single-arm prospective trial (Clé et al., 2023)
Human clinical-outcome trial — disease population (single-arm)
Two caveats govern every page on this site. (1) Telomere length is a contested aging biomarker — it is measured differently by different methods, varies between tissues, and "longer" is not straightforwardly "healthier"; changing a telomere-length or telomerase-activity number in a trial is not the same as slowing human aging. (2) Activating telomerase is not risk-free — telomerase expression is low in many differentiated normal tissues, while some normal proliferating cells can express it. Cancer can also use telomere maintenance; the included human records do not resolve long-term cancer risk from pharmacological activation. Tellingly, the FDA-approved telomerase inhibitor — imetelstat (RYTELO, 2024) — inhibits telomerase to treat cancer (lower-risk MDS), the opposite direction from the anti-aging "activation" narrative.
○ Evidence tier 2 — Human clinical-outcome trial — disease population
Record verify: source publication identified; see evidence and limitations
| Design | Prospective single-arm clinical trial, n=17, 2-year treatment (NCT02055456) |
| N | 17 |
| Registry | NCT02055456 |
| PMID | 36579443 |
| PMCID | PMC10153533 |
| DOI | 10.3324/haematol.2022.281808 |
| Citation status | Original publication identity matched by title, author and DOI; relevant full-text sections, results and limitations examined 2026-10-14. The trial identifier is reported in the original source. |
Five-qualifier claim
| Species / population | 17 patients with short telomeres and/or germline pathogenic variants in telomere-biology genes, with at least one cytopenia and/or radiologic interstitial lung disease. A rare disease population, not healthy aging. |
| Exposure, route, schedule | Nandrolone decanoate 5 mg/kg intramuscularly every 15 days for 2 years. |
| Comparator / duration | Single-arm and prospective: no control group and no randomization. 2-year treatment period with follow-up after cessation. |
| Endpoint / numeric result | Telomere elongation at 12 months in 10 of 13 evaluable patients (77%), mean increase 0.87 kb (95% CI 0.20-1.55; P=0.01). At 24 months all 10 evaluable patients showed elongation, mean 0.49 kb (95% CI 0.24-1.23), but P=0.18 — not statistically significant at that point. Hematologic response in 8 of 16 patients with marrow failure at 12 months (50%) and 10 of 16 at 24 months (63%). Of 7 patients with interstitial lung disease at baseline, 2 had a pulmonary response at 12 months and 3 at 24 months; pulmonary function declined consistently after treatment stopped. |
| What it did NOT establish | Two patients died of pulmonary failure and two of intracranial hemorrhage during nandrolone administration (four deaths in total); none was attributed to nandrolone by the authors. Grade 3 possibly related adverse events occurred, including injection complications; no drug-related grade ≥4 adverse events were reported. Elevated liver tests (88%), acne (59%) and virilization (59%) were common. Without a control group, benefit cannot be causally established; not a healthy-aging or lifespan-extension result. |
Interventions
Primary reference
https://pubmed.ncbi.nlm.nih.gov/36579443/
Each identifier above was confirmed against the primary record; the citation status names the source and the date. An identifier that could not be confirmed is left empty and named as such in the record, never filled in from a secondary source.