A Study to Evaluate the Effect of Pirtobrutinib (LOXO-305) on QTc Interval in Healthy Participants

A Phase I, Single-Dose, Randomized, Partially Double-Blind, Placebo- and Positive-Controlled, 3-Way Crossover Study to Evaluate the Effect of LOXO-305 on QTc Interval in Healthy Subjects

The main purpose of this study is to assess the effect of Pirtobrutinib (LOXO-305) on the heart rate-corrected QT (QTc) interval and to conduct blood tests to measure how much pirtobrutinib (LOXO-305) is in the bloodstream and how the body handles and eliminates pirtobrutinib. The study will also evaluate the safety and tolerability of pirtobrutinib. The study will last up to 71 days, including screening.

Inclusion Criteria:

• Must have Body mass index (BMI) within the range of 18.0 to 32.0 kilograms per square meter (kg/m²), inclusive at Screening
• Male and female participants in good health, determined by no clinically significant findings from medical history, 12-lead Electrocardiogram (ECG), vital sign measurements, or clinical laboratory evaluations as assessed by the investigator
• Female participants of non-childbearing potential and male participants who follow standard contraceptive methods
• Must have comply with all study procedures, including the 15-night stay at the Clinical Research Unit (CRU) and follow-up phone call

Exclusion Criteria:

• History or presence of any diseases or conditions of clinical significance by the Investigator (or designee) and/or Sponsor
• Positive serologic test for hepatitis B surface antigen (HBsAg), hepatitis B virus immunoglobulin M (HBV IgM) core antibody, hepatitis C virus (HCV) antibody, or human immunodeficiency virus (HIV) antibody at Screening.
• Positive polymerase chain reaction (PCR) test for COVID-19 at Screening
• Known ongoing alcohol and/or drug abuse within 2 years prior to Screening
• History of significant hypersensitivity, intolerance, or allergy to any drug compound, food, or other substance, unless approved by the Investigator (or designee)
• Have previously received pirtobrutinib (LOXO-305) in any other study investigating pirtobrutinib (LOXO-305), within 30 days prior to Day 1