A study to investigate the safety, tolerability and pharmacodynamics of MEDI8111 after single ascending doses in healthy male.

A phase I, single-blind, randomised, placebo-controlled, single centre study to investigate the safety, tolerability and pharmacodynamics of intravenous MEDI8111 after single ascending doses in healthy male subjects.

Inclusion Criteria:

• Provision of signed and dated, written informed consent prior to any study specific procedures, Healthy male subjects aged 18-40 years with suitable veins for cannulation or repeated venepuncture, Have a body mass index (BMI) between 18 and 30 kg/m2 inclusive and weight at least 50 kg an no more than 100 kg inclusive, Male subjects should be willing to avoid fathering a child by either true abstinence or the use of two effective means of contraception from the day of dosing until 3 months after dosing with the IP. They should also be willing to use barrier methods from the day of dosing until 3 months after dosing.

Exclusion Criteria:

• Prothrombotic mutation such as factor V Leiden, or deficiencies of protein C, protein S, prothrombin, antithrombin or APC, Antibodies to coagulation FII, History or family history of venous or arterial thromboembolic event, and/or myocardial infarction before age of 50 years, ETP level at baseline >2000nM/min, FII level (by clot) at screening and/or at baseline outside 50-250% of the normal range

At screening, Days 1-5

Limitations: few subjects, high variability of coagulation variables