A Phase 1, First Time in Human (FTIH) Study to Evaluate GSK3352589, a REarranged During Transfection (RET) Growth Factor Receptor Tyrosine Kinase Inhibitor, in Healthy Volunteers

A Phase I, First Time in Human, Two Part, Randomized, Placebo-Controlled, Double-Blind (Sponsor Unblind), Single and Repeat Dose Escalating Study to Evaluate the Safety, Tolerability and Pharmacokinetics of GSK3352589, a REarranged During Transfection (RET) Growth Factor Receptor Tyrosine Kinase Inhibitor, in Normal Healthy Volunteers

This FTIH study is designed to assess the safety, tolerability and pharmacokinetic (PK) of escalating single and repeat oral doses of GSK3352589 in normal healthy volunteers. This is a randomized, double-blind (sponsor unblinded), placebo controlled, dose escalation study that will have two parts; Part A and Part B.

Inclusion Criteria:

• Between 18 and 55 years of age inclusive, at the time of signing the informed consent.
• Healthy as determined by the investigator based on a medical evaluation including medical history, physical examination, laboratory tests and cardiac monitoring. - History of regular bowel habits
• Male or Female of non-childbearing potential.
• Capable of giving signed informed consent which includes compliance with the requirements and restrictions.

Exclusion Criteria:

• ALT and bilirubin >1.5 x upper limit of normal (ULN) (isolated bilirubin >1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).
• Previous Diagnosis of IBS
• Estimated Glomerular Filtration Rate <60 millilter per minute per 1.73 square meter (mL/min/1.73m^2)
• Current or chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones)
• History of Gastroesophageal reflux disease (GERD), dyspepsia, Gastrointestinal (GI) bleeding, diverticulitis, diverticular stricture or other intestinal strictures, GI surgery that could affect motility
• Unwillingness or inability to follow the procedures outlined in the protocol