Study of Phenoptin in Subjects With Phenylketonuria Who Participated in Protocols PKU-004 or PKU-006

BioMarin Pharmaceutical

Status and phase

Completed

Phase 3

Conditions

Phenylketonuria

Treatments

Drug: sapropterin dihydrochloride

Study type

Interventional

Funder types

Industry

Identifiers

NCT00332189

PKU-008

Details and patient eligibility

About

The objective of this study is to evaluate the safety of long-term treatment with Phenoptin in subjects with phenylketonuria (PKU) who participated in Phase 3 clinical studies with Phenoptin.

Enrollment

111 patients

Sex

All

Ages

4+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Participation in study PKU-004 or PKU-006
Willing and able to provide written, signed informed consent or, in the case of subjects under the age of 18 years, provide written assent (if required) and written informed consent by a parent or legal guardian, after the nature of the study has been explained, and prior to any research-related procedures
Negative urine pregnancy test at screening (females of child-bearing potential)
Willing and able to comply with all study procedures

Exclusion criteria

Non-responsive to prior treatment with Phenoptin based on participation in PKU-004 or PKU-006
Perceived to be unreliable or unavailable for study participation or, if under the age of 18 years, have parents or legal guardians who are perceived to be unreliable or unavailable
Terminated early from PKU-004 or PKU-006, except for subjects in PKU-004 that rolled into PKU-008 at Week 22, subjects in PKU-006 that rolled into PKU-008 at Week 10, or subjects in PKU-006 that terminated due to elevated Phe levels following dietary Phe increases
Use of any investigational product other than Phenoptin within 30 days prior to screening, or anticipated requirement for any investigational agent prior to completion of all scheduled study assessments
Positive urine pregnancy test at screening (non-sterile females of child-bearing potential only), already known to be pregnant or breastfeeding or planning a pregnancy in self or partner during the study
Female subjects of childbearing potential must be using an effective method of birth control, as determined by the PI, and willing to continue to use acceptable birth control measures
Concurrent disease or condition that would interfere with study participation or safety (e.g., seizure disorder, oral steroid-dependent asthma or other condition requiring oral or parenteral corticosteroid administration, or insulin-dependent diabetes)
Any condition that, in the view of the PI, renders the subject at high risk from treatment compliance and/or completing the study
ALT > 2 times the upper limit of normal (i.e., Grade 1 or higher based on World Health Organization Toxicity Criteria) at screening (see Appendix 2)
Serious neuropsychiatric illness (e.g., major depression) not currently under medical control
Prior history of organ transplantation
Requirement for concomitant treatment with any drug known to inhibit folate synthesis (e.g., methotrexate)
Concurrent use of levodopa
Clinical diagnosis of primary BH4 deficiency