The purpose of this study is to assess how blood clotting and thinning time is effected when a single dose of warfarin is given alone and when a single dose of warfarin is given with mipomersen; to assess the blood levels of a single dose of warfarin, a single dose of mipomersen, and a single dose of warfarin when given with mipomersen; and to assess the safety of mipomersen when given with or without warfarin.

This will be a Phase 1, open-label, single-sequence, 2-period, crossover study to determine the effect of multiple doses of mipomersen (200 mg SC given every other day for a total of 4 doses) on the PD and PK of warfarin and to evaluate the PK of mipomersen when administered alone and in combination with warfarin. Subjects will be admitted to the clinic on Day -1 until discharge from the clinic on Day 18 and return for outpatient visits on Days 19, 20, and 78. All subjects will receive a single 25-mg oral dose of warfarin given alone on Day 1 (designated the reference treatment). All subjects will then receive 200-mg SC doses of mipomersen given every other day on Days 8, 10, 12, and 14 (total of 800 mg mipomersen) with a single 25-mg oral dose of warfarin also given on Day 14 (combination designated the test treatment).

Inclusion Criteria:

• Written informed consent before any study-related procedure is performed.
• Body mass index (BMI) between 18 and 32 kg/m2, inclusive.
• No clinically significant abnormalities based on medical history, laboratory assessments, vital sign, 12-lead electrocardiogram (ECG) results, and physical examination.
• Subjects willing and able to follow a prescribed diet.
• Subjects have not consumed nicotine or nicotine-containing products for at least 6 months before Screening.
• Subjects are nonpregnant and nonlactating, surgically sterile, postmenopausal, abstinent, or the subject or partner is willing to use a reliable method of contraception during the study and for 5 months after mipomersen dosing.

Exclusion Criteria:

• Poor metabolizer of warfarin as determined by CYP2C9 genotype testing.
• Clinically significant PT, aPTT, INR, protein C, protein S, or platelet count results or hematuria.
• Abnormal prolongation of skin bleeding time or a personal or family history of coagulation or bleeding disorders, vascular malformations including aneurysms, or venous thromboembolism.
• Active or recurring clinically significant cardiovascular, pulmonary, renal, endocrine, hepatic, neurologic, psychiatric, immunologic, hematologic, gastrointestinal, or metabolic disease.
• Active malignancy of any type other than nonmelanomatous skin malignancies.
• Use of any prescribed or over-the-counter concomitant medications within 14 days before the first dose of investigational product without approval of the Investigator and Sponsor.
• Positive test result for drugs of abuse, alcohol, or cotinine or history of alcohol abuse or drug addiction.
• Positive test result for hepatitis B surface antigen, hepatitis C virus antibody, or HIV.