A Study of Migalastat in Pediatric Subjects (2 to <12 Yrs) With Fabry Disease and Amenable GLA Variants

An open-label study to evaluate the safety, pharmacokinetics (PK), pharmacodynamics (PD), and efficacy of migalastat treatment in pediatric subjects 2 to \< 12 years of age with Fabry disease and with amenable GLA variants.

Inclusion Criteria * Male or female subjects, diagnosed with Fabry disease who are between ages 2 and \< 12 years at randomization (subjects aged 11 years must have birthdays \> 30 days after randomization) * Subject's parent or legally authorized representative is willing and able to provide written informed consent and authorization for use and disclosure of personal health information or research-related health information, and subject provides assent, if applicable. * Subject has a GLA variant documented in his/her medical record that is amenable to migalastat prior to Visit 2. * Subject has not received ERT (eg, Replagal® \[agalsidase alfa\] or Fabrazyme® \[agalsidase beta\]) for at least 14 days prior to Baseline visit. * Subject has at least 1 documented complication (ie, historical or current laboratory abnormality or sign/symptom) of Fabry disease * If of reproductive potential, both male and female subjects agree to use a medically accepted method of contraception throughout the duration of the study and for up to 30 days after their last dose of migalastat. Exclusion Criteria * Has moderate or severe renal impairment (eGFR \< 60 mL/min/1.73 m2 at Visit 1 \[screening\]). * Has advanced kidney disease requiring dialysis or kidney transplantation. * History of allergy or sensitivity to migalastat (including excipients) or other iminosugars (eg, miglustat, miglitol). * Has received any investigational/experimental drug, biologic, or device within 30 days or 5 half-lives of the investigational product (whichever is longer) before Visit 1 (screening). * Has received any gene therapy at any time or anticipates starting gene therapy during the study period. * Requires treatment with Glyset (miglitol) or Zavesca (miglustat), within 6 months before Visit 1(screening) or throughout the study. * Has any intercurrent illness or condition at Visit 1 (screening) or Visit 2 (baseline) that may preclude the subject from fulfilling the protocol requirements or suggests to the investigator that the potential subject may have an unacceptable risk by participating in this study. * Pregnant or breastfeeding * Otherwise unsuitable for the study in the opinion of the investigator