Pharmacodynamic biomarkers in people with hemophilia A receiving multiple ascending doses of NXT007
Notice bibliographique
Résumé
Abstract Background: NXT007 is a bispecific, monoclonal antibody that mimics the function of activated factor (F)VIII. NXT007 was engineered and optimized based on emicizumab. The Phase I/II multiple ascending dose (MAD) study of NXT007 (NCT05987449) is an open-label, non-randomized, multicenter trial, testing increasing subcutaneous doses of NXT007 in people with hemophilia A (PwHA). NXT007 demonstrated comparable thrombin generation (TG) to FVIII levels in the non-hemophilia range in in vitro spiking experiments (Teranishi-Ikawa et al. J Thromb Haemost 2024). Here, we present the pharmacodynamic (PD) and exploratory biomarker data, as well as pharmacokinetic–PD relationships, from this NXT007 study. Methods: Prior to starting NXT007, participants received one dose of 40 IU/kg of their standard-of-care FVIII treatment during a pre-treatment visit. This dose, based on an average in vivo recovery (IVR) of 2 IU/dL per IU/kg, was expected to achieve plasma FVIII activity of approximately 80 IU/dL. Plasma samples were collected prior to FVIII infusion and 15 minutes (min), 1 hour (h) and 3 h post infusion. During the NXT007 treatment period, samples were collected prior to loading doses of NXT007 at Days 1 and 15, and at trough concentrations during maintenance treatment every 4 weeks from Day 29. PD biomarkers included activated partial thromboplastin time (aPTT), FVIII-like activity (human chromogenic FVIII activity assay, Hyphen BioMed) and FXIa-triggered TG (Ceveron s100, Technoclone), and were measured in plasma samples collected during the pre-treatment and NXT007 treatment visits. To compare the PD effects of FVIII and NXT007, samples collected at Day 29 during NXT007 treatment, when loading doses were completed and maintenance dosing started, were compared with the samples taken 15 min after FVIII administration. In addition, FIX and FX concentrations, prothrombin time (PT), D-dimer, prothrombin fragment 1+2 (PF1+2) and fibrinogen were measured during NXT007 treatment. NXT007 plasma concentrations were measured using a validated immunoassay. Results: Large variability was observed in the measured plasma FVIII activity after FVIII administration during the pre-treatment visit. The 15 min post-FVIII administration time point was used for comparing PD effects during NXT007 treatment, as that is when the highest FVIII activity was generally observed. After the first NXT007 dose in all cohorts, aPTT shortened and remained below normal range throughout the study. FVIII-like activity and TG peak height increased during NXT007 loading doses and were sustained from Day 29 onwards. PD effects increased with increasing NXT007 doses. The maximum effect on aPTT was reached at low, sub-therapeutic NXT007 concentrations. FVIII-like activity increased linearly with increasing NXT007 plasma concentrations and TG peak height increased following an Emax model approaching maximum effect at the highest concentrations. In the lowest dose NXT007 cohort (Cohort 1), mean TG peak height at Day 29 was lower than the mean TG peak height 15 min post FVIII administration (pre-treatment visit). Mean TG peak heights in Cohorts 2 and 3 at Day 29 were close to the mean post-FVIII-infusion TG peak height at the pre-treatment visit, which was expected to achieve FVIII-like activity within the non-hemophilia range. No changes in FIX and FX concentrations, PT, D-dimer or fibrinogen were observed during NXT007 treatment, and increasing NXT007 concentrations had no impact on these markers. A slight increase in PF1+2 was seen, but was not considered to be of clinical significance. Conclusions: PD markers were well correlated with NXT007 concentrations and demonstrated stable activity throughout the maintenance-dosing period, while safety biomarkers remained unaffected. In PwHA receiving prophylaxis with NXT007, the TG peak height during the steady state was in the non-hemophilia range and comparable to that obtained in participants with FVIII levels in the normal range.
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Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».