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hrp0092fc2.1 | Bone, Growth Plate and Mineral Metabolism Session 1 | ESPE2019

Continued Improvement in Clinical Outcomes with Burosumab, a Fully Human Anti-FGF23 Monoclonal Antibody: Results from a 3-Year, Phase 2, Clinical Trial in Children with X-Linked Hypophosphatemia (XLH)

Linglart Agnès , Carpenter Thomas O. , Högler Wolfgang , Imel Erik A. , Portale Anthony A. , Boot Annemieke , Padidela Raja , Van't Hoff William , Mao Meng , Skrinar Alison , Scott Roberts Mary , San Martin Javier , Whyte Michael P.

In children with XLH, excess FGF23 causes hypophosphatemia with consequent rickets, skeletal deformities, and impaired growth and mobility. We previously reported that burosumab improved phosphate homeostasis and rickets in children with XLH. Here, we report final data from this Phase 2 Study CL201 (NCT02163577).Fifty-two children with XLH (5-12 years old, Tanner ≤ 2) were randomized 1:1 to receive subcutaneous burosumab every 2 (Q2W) or 4 (Q4W) we...

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hrp0092fc2.2 | Bone, Growth Plate and Mineral Metabolism Session 1 | ESPE2019

Benefits of Long-Term Burosumab Persist in 11 Girls with X-Linked Hypophosphatemia (XLH) Who Transitioned into Adolescence During the Phase 2 CL201 Trial

Boot Annemieke , Carpenter Thomas O. , Högler Wolfgang , Imel Erik A. , Portale Anthony A. , Linglart Agnès , Padidela Raja , Van't Hoff William , Mao Meng , Skrinar Alison , Scott Roberts Mary , San Martin Javier , Whyte Michael P.

In children with XLH, excess FGF23 causes hypophosphatemia with consequent rickets, skeletal deformities, and impaired growth and mobility. We reported that burosumab improved phosphate homeostasis and rickets in children with XLH. Here, we present data on 11/52 subjects (all girls) who developed fused growth plates during the phase 2 study CL201 (NCT02163577).In CL201, 52 subjects (Baseline: 5-12 years-old, Tanner ≤ 2) were randomized 1:1 to recei...

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hrp0092rfc2.1 | Bone, Growth Plate and Mineral Metabolism Session 1 | ESPE2019

Burosumab Resulted in Better Clinical Outcomes Than Continuation with Conventional Therapy in Both Younger (1-4 Years-Old) and Older (5-12 Years-Old) Children with X-Linked Hypophosphatemia

Högler Wolfgang , Imel Erik A. , Whyte Michael P. , Munns Craig , Portale Anthony A. , Ward Leanne , Nilsson Ola , Simmons Jill H. , Padidela Raja , Namba Noriyuki , Cheong Hae Il , Mao Meng , Skrinar Alison , San Martin Javier , Glorieux Francis

In children with X-linked hypophosphatemia (XLH), excess circulating fibroblast growth factor 23 (FGF23) causes hypophosphatemia with consequent rickets, skeletal deformities, and impairments in growth and mobility. Compared to continuation with conventional therapy (oral phosphate and active vitamin D [Pi/D]), switching to treatment with burosumab, a fully human monoclonal antibody against FGF23, showed significantly greater improvement in phosphate homeostasis, rickets sever...

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ESPE Abstracts

Continued Improvement in Clinical Outcomes with Burosumab, a Fully Human Anti-FGF23 Monoclonal Antibody: Results from a 3-Year, Phase 2, Clinical Trial in Children with X-Linked Hypophosphatemia (XLH)

Benefits of Long-Term Burosumab Persist in 11 Girls with X-Linked Hypophosphatemia (XLH) Who Transitioned into Adolescence During the Phase 2 CL201 Trial

Burosumab Resulted in Better Clinical Outcomes Than Continuation with Conventional Therapy in Both Younger (1-4 Years-Old) and Older (5-12 Years-Old) Children with X-Linked Hypophosphatemia

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