A Study of GDC-0134 to Determine Initial Safety, Tolerability, and Pharmacokinetic Parameters in Participants With Amyotrophic Lateral Sclerosis


About this study

This first-in-human, double-blind, placebo-controlled Phase I study will be conducted in participants with amyotrophic lateral sclerosis (ALS) to explore safety, tolerability, and pharmacokinetic (PK) properties of GDC-0134. It will include two components: a Single-Ascending-Dose (SAD) stage and a Multiple-Ascending-Dose (MAD) stage.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Male or female participants with a diagnosis of possible, laboratory-supported probable, probable, or definite ALS according to modified El Escorial criteria.
  • Upright forced vital capacity of at least 50 percent (%).
  • Ability to fast from food for 8 hours prior to dosing and 2 hours after dosing.

Exclusion Criteria:

  • Currently taking riluzole unless on a stable dose for the 3 months prior to Day -1 and without current liver enzyme or liver function abnormalities.
  • Currently taking edaravone unless after completion of at least the second 14-day drug-treatment period, as long as Day 1 occurs during a drug-free period at least 24 hours after the last edaravone dose and at least 5 days prior to the first dose of the next cycle.
  • Positive for hepatitis C antibody, hepatitis B surface antigen, or human immunodeficiency virus (HIV) antibody.
  • Clinically significant thrombocytopenia.
  • Currently taking nutritional/herbal supplements, except for over-the-counter vitamins that are within Recommended Dietary Allowance (RDA), unless discontinued at least 7 days prior to Day −1, except upon approval of both the investigator and Sponsor.
  • For participants participating in a designated drug-drug interaction (DDI) cohort in the MAD stage of the study, who require midazolam/caffeine administration: known allergy, religious prohibition, or other condition limiting midazolam or caffeine administration.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status

Jacksonville, Fla.

Mayo Clinic principal investigator

Bjorn Oskarsson, M.D.

Closed for enrollment

More information


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