To Assess Safety, Tolerability and Efficacy of LJN452 in Patients With Primary Bile Acid Diarrhea.

A Double Blind, Randomized Placebo Controlled Crossover Multiple Dose Study of LJN452 to Assess Safety, Tolerability and Efficacy in Patients With Primary Bile Acid Diarrhea (pBAD).

The purpose of this study is to determine whether LJN452 improves the symptoms of bile acid diarrhea and to assess its safety and tolerability profile in patients with primary bile acid diarrhea (pBAD) to guide decision-making regarding further clinical development in this indication.

Key Inclusion Criteria:

• A history of diarrheal symptoms for at least 3 months prior to dosing - Average stool frequency of at least 2 per day when off therapy AND Average stool form of >5 on Bristol Stool Chart.
• Previous laboratory or radiological confirmation of bile acid malabsorption with either fecal bile acid loss OR 7 day 75Selenium homocholic acid taurine (75SeHCAT) retention.
• Age ≥ 18 years.

Key Exclusion Criteria:

• Patients with other diagnoses leading to diarrhea, including colorectal neoplasia, ulcerative colitis, Crohn's disease, celiac disease, chronic pancreatitis, drug-induced diarrhea or active infection AND Patients who have not been investigated by standard clinical assessments to exclude these disorders.
• Treatment with bile acid sequestrants (colestyramine, colestipol, colesevelam) for 2 weeks before the first dose of LJN452. A washout of 14 days for these agents will be allowed before first dosing.
• Women of child-bearing potential, defined as all women physiologically capable of becoming pregnant.
• A positive Hepatitis B surface antigen or Hepatitis C test result.
• History of immunodeficiency diseases, including a positive HIV (ELISA and Western blot) test result.