Dose Confirmation Trial of AAV5-hFIXco-Padua

This is an open-label, single-dose, single-arm, multi-center trial, with a screening, a treatment + post-treatment follow-up phase, and a long-term follow-up phase. The IMP AMT-061 is a recombinant adeno-associated viral vector of serotype 5 (AAV5) containing the Padua variant of a codon-optimized human FIX complementary deoxyribonucleic acid (cDNA) under the control of a liver-specific promoter. The IMP is identified as AAV5-hFIXco-Padua (AMT- 061). The pharmaceutical form of AMT-061 is a solution for intravenous infusion. The administered dose of AMT-061 will be 2 x 10\^13 gc/kg.