The purpose of this study is to determine the safety, tolerability and blood levels of orally administered anle138b in healthy subjects.

This is a single-centre, study of double-blind, randomised, placebo-controlled single ascending doses (SAD) and multiple ascending doses (MAD) of anle138b in healthy subjects in study Parts 1 and 2. In study Part 3 the effect of food (FES) on the safety and PK of anle138b in healthy subjects is examined.

In the SAD cohorts, subjects will be randomly assigned to receive a single oral dose of active investigational medicinal product (IMP) or matching placebo in a sequential escalating manner with sufficient time planned between dose groups to allow interim review of the data.

In the MAD cohorts, subjects will be randomly assigned to receive oral doses of active IMP or matching placebo once daily (QD) for 7 days, in a sequential escalating manner with sufficient time planned between dose groups to allow interim review of the data.

In the FES, the effect of food on the safety and PK of anle138b is explored by administering a single dose of IMP after a high-fat breakfast. Subjects will be randomly assigned to one of 2 treatment sequence to receive anle138b in the fed or fasted state over 2 periods.

Inclusion Criteria:

1. Healthy males or women of no child bearing potential
2. Age 18 to 55 years of age at the time of signing informed consent
3. Body mass index (BMI) of 18.5 to 30.0 kg/m2 as measured at screening
4. Must be willing and able to communicate and participate in the whole study
5. Must provide written informed consent
6. Must agree to adhere to the contraception requirements defined in Section 9.4
7. In the investigator's opinion, subject is able to understand the nature of the study and any risks involved in participation, and willing to cooperate and comply with the protocol restrictions and requirements.

Exclusion Criteria:

1. Subjects who have received any IMP in a clinical research study within the 90 days prior to Day 1.
2. Subjects who are study site employees, or immediate family members of a study site or sponsor employee.
3. Subjects who have previously been enrolled in this study. Subjects who have taken part in Part 1 are not permitted to take part in Part 2 or Part 3; subjects who have taken part in Part 2 are not permitted to take part in Part 3.
4. History of any drug or alcohol abuse in the past 2 years.
5. Regular alcohol consumption in males >21 units per week and females >14 units per week (1 unit = ½ pint beer, or a 25 mL shot of 40% spirit, 1.5 to 2 units = 125 mL glass of wine, depending on type).
6. A confirmed positive alcohol breath test at screening or admission.
7. Current smokers and those who have smoked within the last 12 months. A confirmed breath carbon monoxide reading of greater than 10 ppm at screening or admission.
8. Current users of e-cigarettes and nicotine replacement products and those who have used these products within the last 12 months.
9. Females of childbearing potential including those who are pregnant or lactating (all female subjects must have a negative urine pregnancy test at screening and serum pregnancy test on admission). A woman is considered of childbearing potential unless she is permanently sterile (hysterectomy, bilateral salpingectomy and bilateral oophorectomy) or is postmenopausal (had no menses for 12 months without an alternative medical cause and a serum follicle stimulating hormone concentration ≥40 IU/L).
10. Subjects with pregnant or lactating partners.
11. Subjects who do not have suitable veins for multiple venepunctures/cannulation as assessed by the investigator or delegate at screening.
12. Clinically significant abnormal clinical chemistry, haematology or urinalysis as judged by the investigator (laboratory parameters are listed in Appendix 1). Subjects with Gilbert's Syndrome are allowed. In addition the ALT and gamma glutamyl transferase (GGT) concentrations should not exceed the upper limit of normal (ULN) at screening and admission.
13. Confirmed positive drugs of abuse test result (drugs of abuse tests are listed in Appendix 1) at screening or admission.
14. Positive hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab) or human immunodeficiency virus (HIV) results
15. Evidence of renal impairment at screening, as indicated by an estimated creatinine clearance of <70 mL/min using the Cockcroft-Gault equation.
16. History of clinically significant cardiovascular, renal, hepatic, chronic respiratory or gastrointestinal disease, neurological or psychiatric disorder, as judged by the investigator.
17. Serious adverse reaction or serious hypersensitivity to any drug or the IMP excipients.
18. Presence or history of clinically significant allergy requiring treatment, as judged by the investigator. Hay fever is allowed unless it is active.
19. Donation or loss of greater than 400 mL of blood within the previous 3 months.
20. Subjects who are taking, or have taken, any prescribed or over-the-counter drug or herbal remedies (other than 4 g of paracetamol per day or HRT) in the 14 days before IMP administration (See Section 11.4). Exceptions may apply on a case by case basis, if considered not to interfere with the objectives of the study, as determined by the PI.
21. Failure to satisfy the investigator of fitness to participate for any other reason.
22. In Part 3, subjects must be able to eat 90% of the US Food and Drug Administration (FDA)-approved high-fat breakfast, including bacon.
23. Subjects with a previous history of difficulty in swallowing tablets or capsules, or an anticipated problem with swallowing a large number of capsules.
24. Blood pressure (supine) at Screening or admission outside the range: 90 to 140 mmHg for subjects <45 years or 90 to 160 mmHg for subjects >45 years for systolic BP or 40 to 90 mmHg for diastolic BP; and pulse rate outside the range of 40 to 100 bpm, unless deemed not clinically significant by the investigator and the sponsor's medical monitor.
25. Subjects with a history of cholecystectomy or gall stones.

This study is double-blind. Treatment assignment will not be known to the subjects, the sponsor or the staff who are involved in the clinical evaluation of the subjects and the analysis of data. The randomisation schedule and disclosure envelopes will be generated by an unblinded statistician at Quotient Sciences.

The FES is an open label study which includes a randomized sequence of fasted and fed state.