| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated | 
| Primary biliary cirrhosis complicated by cholestatic pruritus. |  | 
| E.1.1.1 | Medical condition in easily understood language | 
| Primary biliary cirrhosis complicated by cholestatic pruritus. |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Digestive System Diseases [C06] | 
| MedDRA Classification | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| The primary efficacy objective of this Phase IIa study is to demonstrate the efficacy of once daily dosing of A4250, 1.5 - 3 mg orally during a
 four-week treatment period to relieve patients with Primary Biliary
 Cirrhosis (PBC) from cholestatic pruritus as determined by evaluation of
 effects on pruritus using a visual analogue scale (VAS).
 
 The primary safety objective of this study is to assess the safety and
 tolerability of A4250, 1.5 - 3 mg orally during a four-week treatment
 period, in patients with PBC and cholestatic pruritus, as determined by
 the occurrence of treatment-emergent SAEs.
 |  | 
| E.2.2 | Secondary objectives of the trial | 
| Secondary efficacy objectives of this study are to demonstrate the efficacy of A4250 orally on other pruritus variables and on QoL and
 lysophosphatidic acid formation.
 
 Secondary safety objectives of this study include assessment of the
 safety and tolerability of A4250 during a four-week treatment period, as
 determined by the occurrence of treatment-emergent AEs and changes
 in other safety parameters including liver and kidney function tests and
 vital signs.
 |  | 
| E.2.3 | Trial contains a sub-study | No | 
| E.3 | Principal inclusion criteria | 
| • Diagnosis of PBC or PBC-Autoimmune hepatitis overlap as established according to
 AASLD/EASL definitions. Definite or probable PBC diagnosis, as
 demonstrated by the presence of ≥ 2 of the following 3 diagnostic
 factors:
 • History of elevated ALP levels (>1.67 ULN) for at least 6 months prior
 to Day 1
 • Positive antimitochondrial antibodies (AMA) titer or if AMA negative or in low titer (<1:80) PBC specific antibodies (anti-GP210 and/or anti-
 SP100 and/or antibodies against the major M2 components (PDC-E2, 2-
 oxo-glutaric acid dehydrogenase complex)
 • Liver biopsy consistent with PBC
 
 • UDCA non-responders defined as >6 months of UDCA and at the time
 of enrolment a serum ALP >1.67 ULN.
 • Laboratory markers of cholestasis identified within 3 months of Visit
 1
 • Treatment with cholestyramine at a dose >4g BID or colestipol > 5mg
 for at least 3 months
 • The patient has a VAS-Itch of at least 30 mm during the day before
 baseline (Visit 2)
 • The patient reports having understood and has signed both the ICF
 and is willing to comply with all study visits and assessments;
 • The patient is a male or non-pregnant female ≥18 years of age and ≤
 80 years of age with body mass index (BMI) ≥18.5 but <35 kg/m2
 • Women of childbearing capacity (WOCBC) must have a negative
 serum pregnancy test upon inclusion in the trial. WOBC must agree to
 maintain highly effective birth control or practice abstinence (i.e.
 abstaining from penile-vaginal intercourse) if this is the subject's
 preferred and usual lifestyle. The following methods for birth control,
 when used consistently and correctly, offer protection from pregnancy
 with a Pearl index of <1 (i.e. <1% per year) and can be accepted as
 highly effective;
 • Oral hormone contraceptives, with the exception of low-dose
 gestagens (e.g. lynestrenol norestisteron)
 • Injectable or implanted hormonal contraceptives
 • Intrauterine devices
 • Intrauterine systems (e.g. progestin-releasing coil)
 The following conditions are also acceptable;
 • Vasectomised male partner with appropriate post-vasectomy
 documentation of the absence
 |  | 
| E.4 | Principal exclusion criteria | 
| English • Any condition that, in the opinion of the Investigator constitutes a risk for the patient or a contraindication for participation and completion of the study, or could interfere with study objectives, conduct, or
 evaluations.
 • Jaundice of extrahepatic origin
 • The patient has a structural abnormality of the GI tract.
 • The patient has a known, active, clinically significant acute or chronic
 infection, or any major episode of infection requiring hospitalization or
 treatment with parenteral anti infectives within 4 weeks of treatment
 start (study day 1) or completion of oral anti-infective treatment within
 2 weeks prior to start of screening period;
 • The patient has unexplained and clinically significant GI alarm signals
 (e.g., lower GI bleeding or heme-positive stool, iron-deficiency anemia,
 unexplained weight loss) or systemic signs of infection or colitis;
 • The patient has rectal bleeding and/or is heme-positive in the
 absence of known internal or external hemorrhoids;
 • The patient has a history of cancer with last date of proven disease
 activity/presence of malignancy within 5 years, except for adequately
 treated basal cell carcinoma of the skin, cervical dysplasia, or carcinoma
 in situ of the skin or the cervix
 • Other reason for itching such as atopic dermatitis, other primary skin
 diseases etc.
 • Chronic kidney disease
 • Active substance abuse in the year before screening
 • The patient has a history of a psychiatric disorder requiring
 hospitalization or suicide attempt in the 2 years prior to Screening;
 • The patient has participated in any investigational clinical study
 within 30 days prior to Screening or within 5 half-lives of the
 investigated compound (whichever is longer) prior to Screening (unless
 the patient was never randomized to study treatment), or plans to
 participate in another clinical study during this study;
 • The patient is a pregnant, breast-feeding or lactating female.
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| The primary efficacy endpoint is change in VAS-Itch (most severe itch during last 24 hrs) during the fourth treatment week of A4250 compared
 to the fourth week of treatment period 1.
 
 The primary safety endpoint will be the occurrence of treatmentemergent
 SAEs during the four weeks of treatment with A4250.
 |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| During the fourth treatment week of A4250 compared to the fourth week of treatment period 1.
 |  | 
| E.5.2 | Secondary end point(s) | 
| Secondary efficacy endpoints are: • Change in VAS-Itch (most severe itch during last 24 hrs) during the
 fourth treatment week of A4250 compared to the fourth week of
 treatment period 3 and compared to baseline
 • Change in 5-D Pruritus scale and PBC40 from baseline and from week
 4 of treatment period 1 to fourth week of A4250 treatment and from
 week 4 of A4250 treatment to week 4 of the third treatment period
 • Change in individual and total serum and fecal BAs, FGF19, C4 and
 serum lysophosphatidic acid from baseline and from last day in week 4
 of treatment period 1 to last day in week 4 of A4250 treatment and from
 last day of week 4 of A4250 treatment to last day of week 4 of the third
 treatment period
 • Change in ALP, AST and ALT from baseline and from last day of week
 4 of treatment period 1 to last day in week 4 of A4250 treatment and
 from last day of week 4 of A4250 treatment to last day of week 4 of the
 third treatment period
 • Change in Composite endpoint of ALP and serum bilirubin from
 baseline and from last day of week 4 of treatment period 1 to last day of
 week 4 week of A4250 treatment and from last day of week 4 of A4250
 treatment to last day of week 4 of the third treatment period
 • Change from week 4 of first treatment period to week 4 of A4250 in
 weekly stool consistency of BMs (BSFS) and from week 4 of A4250
 treatment to week 4 of the third treatment period
 • Change in gut microbiota composition
 
 Secondary safety endpoints will include:
 • Occurrence of TEAEs during the four A4250 treatment weeks.
 Description and severity of any AE will also be reported;
 • Changes in safety laboratory test results (including hematology,
 clinical chemistry and urinalysis) from baseline to Day 28 of A4250
 treatment;
 • Discontinuations from treatment with reasons given.
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| At the end of the four weeks' treatment period with A4250 |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | No | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | Yes | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | Yes | 
| E.7.3 | Therapeutic confirmatory (Phase III) | No | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | No | 
| E.8.1.1 | Randomised | No | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | No | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | No | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | No | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | No | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial | 
| The End-of-Study Visit (Visit 8) will take place 14 days after end of Period 3, (Day 126) OR 14 days after the last dose of study medication,
 whether the patient completes the study or discontinues prematurely.
 In this visit the possible occurrence of adverse events will be
 monitored and recorded in the appropriate section of the Case Report
 Form.
 |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 1 | 
| E.8.9.1 | In the Member State concerned months | 6 | 
| E.8.9.1 | In the Member State concerned days | 0 |