This is a two-part study, comprised of an initial open-label run-in phase (Part 1) in a subset of 3 subjects to provide first data regarding safety, and feasibility of the percutaneous endovascular catheter-facilitated intramyocardial delivery of XC001 in patients with RA due to obstructive CAD.

Part 1 of the study is comprised of 3 subjects with RA (CCS class II-IV) who will receive 4×1011 viral particles (vp) XC001. An Independent Data Monitoring Committee (IDMC), the committee will review safety and feasibility data and approval to commence enrollment in Part 2 of the study.

Part 2 is a randomized, double-blind, sham-procedure control study. Subjects with RA (CCS class II-IV) with no therapeutic options will be randomized 1:1 to either the treatment group with catheter delivery of 4×1011 vp XC001 (approximately N=53) or a sham procedure group (approximately N=53). It is estimated that approximately 106 subjects will be randomized to result in 100 evaluable subjects. All subjects enrolled in Part 1, as well as Part 2 will follow all screening and safety monitoring procedures for up to 12 months (Table 2), and will be included in the safety analysis of the study.