Phase 2 Study to Evaluate LUM001 in Combination With Ursodeoxycholic Acid in Patients With Primary Biliary Cirrhosis (CLARITY)

Phase 2 Study to Evaluate LUM001 in Combination With Ursodeoxycholic Acid in Patients With Primary Biliary Cirrhosis

A Phase 2, Randomized, Double-blind, Placebo-controlled Study to Evaluate LUM001, an Apical Sodium-dependent Bile Acid Transporter Inhibitor (ASBTi) in Combination With Ursodeoxycholic Acid (UDCA) in Patients With Primary Biliary Cirrhosis

The study is a randomized, double-blind, placebo-controlled, multicenter study. It is a 13-week Phase 2 study in adults with primary biliary cirrhosis designed to compare the effect of daily dosing with UDCA in combination with LUM001 or placebo.

Change From Baseline in Pruritus Using Adult Itch Reported Outcome (ItchRO) Weekly Sum Score at Week 13/ Early Termination (ET)

Pruritus was assessed using ItchRO measure, administered as an electronic diary (eDiary) which was completed by the participants twice daily (morning and evening). (ItchRO) scores ranged from 0 to 10, with 0 representing no itch and 10 representing very severe itching. The highest score between the morning and evening ItchRO reports represented the daily score: a measure of the worst itching over the previous 24-hour period. The weekly sum score was calculated as the sum of the daily scores for the 7 days prior to the time point being reported: 7 days prior to randomization or 7 days prior to Week 13/ET visit.

ItchRO scores had a range from 0 to 10, with 0 representing no itch and 10 representing very severe itching. The highest score between the morning and evening ItchRO reports represented the daily score: a measure of the worst itching over the previous 24-hour period. The weekly sum score was calculated as the sum of the daily scores for the 7 days prior to the time point being reported: 7 days prior to randomization or 7 days prior to Week 13/ET visit.

Change From Baseline in Pruritus Using Adult ItchRO Average Daily Scores at Weeks 4, 8, 13, and Last Post-baseline Visit (Week 13/ET)

ItchRO scores had a range from 0 to 10, with 0 representing no itch and 10 representing very severe itching. The highest score between the morning and evening ItchRO reports represented the daily score: a measure of the worst itching over the previous 24-hour period. Adult ItchRO average daily score was the sum of daily scores divided by the number of days adult ItchRO was completed, using the 7 days prior to the reported visit date.

Change From Baseline in Alkaline Phosphatase (ALP) at Weeks 4, 8, 13, and Last Post-baseline Visit (Week 13/ET)

The 5-D itch (validated instrument to measure pruritus) scale was developed for the multidimensional quantification of pruritus that is sensitive to change over time. The 5-D itch scale included 5 domains (duration, degree, direction, disability, and distribution of pruritus). The total 5-D score was obtained by scoring each of the domains separately and then summing them together. 5-D total scores ranged between 5 (no pruritus) and 25 (most severe pruritus).

Change From Baseline in Fasting Serum Bile Acid Level at Weeks 4, 8, 13, and Last Post -Baseline Visit (Week 13/ET)

Change From Baseline in Bile Acid Synthesis as Measured by Serum 7 Alpha-Hydroxy-4-Cholesten-3-One C4 Level [7 Alpha C4]) at Weeks 4, 8, 13, and Last Post -Baseline Visit (Week 13/ET)

C4 7 alpha-hydroxy-4-cholesten-3-one is an intermediate in the biochemical synthesis of bile acids from cholesterol and its concentrations reflect the activity of the bile acid synthetic pathway. Elevated levels of C4 indicate bile acid malabsorption. Laboratory C4 levels were evaluated using blood samples collected.

Number of Participants With Treatment-emergent Adverse Events (TEAEs) and Treatment-emergent Serious Adverse Events (TESAEs)

An adverse event (AE) was defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of an investigational product, whether or not considered related to the product. A serious adverse event (SAE) was defined as an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged in-patient hospitalization; life-threatening; persistent or significant disability/incapacity; congenital anomaly or birth defect; an important medical event that did not meet any of the above criteria but jeopardized the participant or required medical or surgical intervention to prevent one of the outcomes listed above. A TEAE was defined as any AE that occurred during the study, from the start of investigational product dosing through the end of the study (13 weeks of treatment period (or ET) + 14 days ]), or that worsened since the start of dosing.

From the first dose of study drug until the 13 weeks of treatment period (or ET) + 14 days (approximately 15 weeks)

Inclusion Criteria: Diagnosis of Primary Biliary Cirrhosis Moderate to severe pruritus Taking ursodeoxycholic acid (UDCA) for at least 6 months, or unable to tolerate UDCA Ability to understand and willingness to sign informed consent prior to initiation of any study procedures Exclusion Criteria: History or presence of other concomitant significant liver disease Liver transplant Known HIV infection Women who are pregnant or lactating