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<p>This prospective phase 1 pilot study evaluated the safety and efficacy of GS001, an adeno-associated virus serotype 8 (AAV8)-based vector encoding B-domain–deleted factor VIII with exploratory assessment of prophylactic immunosuppression. Twelve adult severe hemophilia A participants were enrolled. Participants received GS001 at either 2×10¹² (low dose cohort) or 4×10¹² (high dose cohort) vg/kg following prophylactic treatment with prednisone alone or prednisone plus tacrolimus starting from one week before GS001 infusion. Median (range) follow-up was 156.0 (144.0-208.0) / 110.5 (104.0-130.0) weeks (2×10¹² / 4×10¹² vg/kg). Transgene expression peaked at 5-7 weeks post-infusion. In low dose cohort, at week 144.0, median (range) factor VIII activity was 5.6 (0.5-52.0) IU/dL (n = 6). In high dose cohort, at week 104.0, median (range) factor VIII activity was 42.7 (29.4-92.1) IU/dL (n = 6) and all six participants sustained factor VIII levels above 29 IU/dL. Both cohorts showed significant reductions in annualized bleeding rate and factor VIII consumption with grade 1-2 adverse events. Alanine aminotransferase elevations occurred in 3/6 and 5/6 low/high-dose participants and most were grade 1. The Single-cell RNA analysis demonstrated that the prednisone plus tacrolimus pretreatment effectively inhibited CD8<sup>+</sup> T cell immune responses in both cohorts. Overall, GS001 infusion was safe and well-tolerated, achieving a significant increase in factor VIII level. Pre-treatment with glucocorticoids and tacrolimus may benefit by suppressing induced immune responses, thereby enhancing transgene expression without increasing the risk of infection. This study was registered at <a href="http://www.clinicaltrials.gov">www.clinicaltrials.gov</a> as # NCT04728841.</p>

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Phase 1 pilot study for hemophilia-A: AAV8 vector with prophylactic tacrolimus-glucocorticoid achieves therapeutic FVIII activity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月11日

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  • Wei Liu,
  • Xiaolei Pei,
  • Tenghui Yu,
  • Bingqi Xu,
  • Xinyue Dai,
  • Feng Xue,
  • Lingling Chen,
  • Xiaolin Wang,
  • Yuhua Wang,
  • Yunfei Chen,
  • Xiaofan Liu,
  • Rongfeng Fu,
  • Wentian Wang,
  • Ying Chi,
  • Hui yuan Li,
  • Renchi Yang,
  • Lei Zhang

摘要

This prospective phase 1 pilot study evaluated the safety and efficacy of GS001, an adeno-associated virus serotype 8 (AAV8)-based vector encoding B-domain–deleted factor VIII with exploratory assessment of prophylactic immunosuppression. Twelve adult severe hemophilia A participants were enrolled. Participants received GS001 at either 2×10¹² (low dose cohort) or 4×10¹² (high dose cohort) vg/kg following prophylactic treatment with prednisone alone or prednisone plus tacrolimus starting from one week before GS001 infusion. Median (range) follow-up was 156.0 (144.0-208.0) / 110.5 (104.0-130.0) weeks (2×10¹² / 4×10¹² vg/kg). Transgene expression peaked at 5-7 weeks post-infusion. In low dose cohort, at week 144.0, median (range) factor VIII activity was 5.6 (0.5-52.0) IU/dL (n = 6). In high dose cohort, at week 104.0, median (range) factor VIII activity was 42.7 (29.4-92.1) IU/dL (n = 6) and all six participants sustained factor VIII levels above 29 IU/dL. Both cohorts showed significant reductions in annualized bleeding rate and factor VIII consumption with grade 1-2 adverse events. Alanine aminotransferase elevations occurred in 3/6 and 5/6 low/high-dose participants and most were grade 1. The Single-cell RNA analysis demonstrated that the prednisone plus tacrolimus pretreatment effectively inhibited CD8+ T cell immune responses in both cohorts. Overall, GS001 infusion was safe and well-tolerated, achieving a significant increase in factor VIII level. Pre-treatment with glucocorticoids and tacrolimus may benefit by suppressing induced immune responses, thereby enhancing transgene expression without increasing the risk of infection. This study was registered at www.clinicaltrials.gov as # NCT04728841.