Phase 3 Study to Evaluate the Efficacy & Safety of Self-Administered Injections of BMN165 by Adults With PKU (Prism-2)

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BioMarin Pharmaceutical

Status and phase

Phase 3


Phenylketonuria (PKU)


Drug: BMN165 20mg/day
Drug: BMN165 40mg/day
Drug: Placebo

Study type


Funder types




Details and patient eligibility


The BMN 165 clinical development program has been designed to demonstrate the safety and efficacy of BMN 165 in reducing blood Phe concentrations in adults with PKU.

Full description

165-302 is a Phase 3, 4 Part, Randomized, Double-Blind, Placebo-Controlled, Discontinuation Study to Evaluate the Efficacy and Safety of Self Administered Subcutaneous Injections of BMN 165 by Adults With PKU. This study is open only to adults who have been exposed to BMN165 in a previous study. Study BMN 165-302 is a four-Part, Phase 3 study. Part 1: Open-label period Part 2: A Randomized, double-blind, placebo-controlled period of 8 weeks Part 3: Two sub-Parts to Part 3:- Part 3A - BMN 165 administered using vial and syringe during this open label period. Part 3B - BMN 165 administered using prefilled syringe during this open-label period. Part 4: A long-term, open-label extension period.


215 patients




18 to 70 years old


No Healthy Volunteers

Inclusion and exclusion criteria


Individuals eligible to participate in this study must meet all of the following criteria:

  • Have completed a prior BMN 165 study (PAL-003, 165-205, or 165-301) prior to screening
  • Have had a stable BMN 165 dose regimen for at least 14 days prior to screening

Are at least 18 y/o and no older than 70 y/o at screening

  • Subjects who are < 18 y/o and are already enrolled into Study 165-301 under Amendment #1 (10JAN2014) may enroll into this study
  • Has identified a person who is > 18 y/o who has the neurocognitive and linguistic capacities to comprehend and complete the Profile of Mood States (POMS)-Observer rated scale

Has identified a competent person(s) > 18 y/o who can observe the subject during study drug administration at certain points in the study

  • A home healthcare nurse may perform the study drug observations
  • Are willing and able to provide written, signed informed consent after the nature of the study has been explained and prior to any research-related procedures; for minors, parent or guardian provides written consent and assent may be requested
  • Are willing and able to comply with all study procedures
  • For females of childbearing potential, a negative pregnancy test at screening and willing to have additional pregnancy tests during the study

If sexually active, willing to use two acceptable methods of contraception during and for 4 weeks after the study

  • Males post vasectomy for 2 years with no known pregnancies do not need to use any other forms of contraception during the study.
  • Females who have been in menopause for at least 2 years, have had a tubal ligation at least 1 year prior to screening, or have had a total hysterectomy do not need to use any other forms of contraception during the study.
  • Have received documented approval from a study dietitian confirming that the subject is capable of maintaining their diet
  • Have neurocognitive and linguistic capacities to comprehend and answer investigator's prompts for the Attention Deficit Hyperactivity Disorder Rating Scale (ADHD-RS) Investigator rated instrument and to complete the POMS-Subject rated scale
  • If applicable, maintained stable dose of medication for Attention Deficit Hyperactivity Disorder (ADHD), depression, anxiety, or other psychiatric disorder ≥8 weeks prior to enrollment and willing to maintain stable dose throughout study unless a change is medically indicated
  • General good health, as evidenced by physical examination, clinical laboratory evaluations, and ECG tests at screening

Exclusion Criteria

Individuals who meet any of the following exclusion criteria will not be eligible to participate in the study:

  • Use of any investigational product (except BMN 165) or investigational medical device within 30 days prior to screening or requirement for any investigational agent prior to completion of all scheduled study assessments
  • Use of any medication (except BMN 165) intended to treat PKU, including the use of large neutral amino acids, within 2 days prior to the administration of study drug
  • Have known hypersensitivity to Dextran® or components of Dextran
  • Use or planned use of any injectable drugs containing PEG (except for BMN 165), including medroxyprogesterone injection, within 3 months prior to screening and during study participation
  • Current use of levodopa
  • A positive test for HIV antibody, hepatitis B surface antigen, or hepatitis C antibody
  • A history of organ transplantation or taking chronic immunosuppressive therapy
  • A history of substance abuse in the past 12 months or current alcohol or drug abuse
  • Current participation in the Kuvan registry study (PKUDOS). Patients may discontinue the PKUDOS registry trial to allow enrollment in this study
  • Pregnant or breastfeeding at screening or planning to become pregnant (self or partner) or breastfeed at any time during the study
  • Concurrent disease or condition that would interfere with study participation or safety.
  • Major surgery planned during the study period
  • Any condition that in the view of the investigator, places the subject at high risk of poor treatment compliance or terminating early from the study
  • Alanine aminotransferase (ALT) concentration at least 2x the upper limit of normal
  • Creatinine at least 1.5x the upper limit of normal

Trial design

Primary purpose




Interventional model

Parallel Assignment


Triple Blind

215 participants in 4 patient groups, including a placebo group

BMN165 20mg/day
Active Comparator group
BMN165 20mg/day self-administered daily
Drug: BMN165 20mg/day
20 mg/day Placebo
Placebo Comparator group
20 mg/day Placebo self-administered daily
Drug: Placebo
BMN165 40mg/day
Active Comparator group
BMN165 40mg/day self-administered daily
Drug: BMN165 40mg/day
40 mg/day Placebo
Placebo Comparator group
40 mg/day Placebo self-administered daily
Drug: Placebo

Trial contacts and locations



Data sourced from

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