Evidence map›Paper›PMID 16939525›Full record

ArticleBritish journal of clinical pharmacology2007

Population pharmacokinetics of darbepoetin alfa in healthy subjects.

Balaji Agoram, Liviawati Sutjandra, John T Sullivan

Abstract read
In one paragraph

Article in British journal of clinical pharmacology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed, 2 syntheses or guidelines pooled it.

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  18. Erythropoietin pharmacology.Clinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico · 2007
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

Balaji AgoramDepartment of Pharmacokinetics and Drug Metabolism, Amgen Inc., Thousand Oaks, CA 91320, USA.
Liviawati Sutjandra
John T Sullivan

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimTo develop and evaluate a population pharmacokinetic (PK) model of the long-acting erythropoiesis-stimulating protein, darbepoetin alfa in healthy subjects.

methodsPK profiles were obtained from 140 healthy subjects receiving single intravenous and/or single or multiple subcutaneous doses of darbepoetin alfa (0.75-8.0 microg kg(-1), or either 80 or 500 microg). Data were analysed by a nonlinear mixed-effects modelling approach using NONMEM software. Influential covariates were identified by covariate analysis emphasizing parameter estimates and their confidence intervals, rather than stepwise hypothesis testing. The model was evaluated by comparing simulated profiles (obtained using the covariate model) to the observed profiles in a test dataset.

resultsThe population PK model, including first-order absorption, two-compartment disposition and first-order elimination, provided a good description of data. Modelling indicated that for a 70-kg human, the observed nearly twofold disproportionate dose-exposure relationship at the 8.0 microg kg(-1)-dose relative to the 0.75 microg kg(-1)-dose may reflect changing relative bioavailability, which increased from approximately 48% at 0.75 microg kg(-1) to 78% at 8.0 microg kg(-1). The covariate analysis showed that increasing body weight may be related to increasing clearance and central compartment volume, and that the absorption rate constant decreased with increasing age. The full covariate model performed adequately in a fixed-effects prediction test against an external dataset.

conclusionThe developed population PK model describes the inter- and intraindividual variability in darbepoetin alfa PK. The model is a suitable tool for predicting the PK response of darbepoetin alfa using clinically untested dosing regimens.

Indexed as

Models, BiologicalDarbepoetin alfaDelayed-Action PreparationsErythropoietinFemaleHematinicsHumansMaleMiddle AgedDarbepoetin alfaDelayed-Action PreparationsErythropoietinHematinics

Identifiers

PMID16939525
PMCPMC2000706

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.