PIONEER-II RCT trial is a prospective, multicenter, randomized, non-inferiority registry trial. 539 subjects from about 40 interventional cardiology centers in China will be enrolled to evaluate In-stent late lumen loss(LLL) as the primary endpoint at 9 months. And all the subjects will be followed up to 5 years to attain the data of the secondary endpoints.

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Inclusion Criteria:

1. Age 18-75, male or non-pregnant female
2. Evidence of non-symptomatic ischemia, stable or non-stable angina pectoris or past MI
3. Target lesion is primary and de-novo coronary artery disease
4. The target lesion length ≤ 60 mm, diameter 2.25mm-5.0mm (visually estimated)
5. Lesion diameter stenosis ≥70% (visually estimated)
6. For each target lesion, same stent implantation only
7. Acceptable candidate for coronary artery bypass grafting (CABG)
8. Understand the study purpose, willing to participate and sign the letter of consent, agrees to the follow-up visits including a 9 month angiographic follow-up

Exclusion Criteria:

1. Acute MI within 1 week
2. Chronic total occlusion(TIMI 0), left main lesion, intervention-required three-vessel lesions, branch vessel diameter ≥ 2.5mm and bypass lesion
3. More than 3 stents required
4. Patients refuse to be implanted stent
5. Calcified lesion failed in pre-dilation, twisted lesion and lesion unsuitable for stent delivery and expansion
6. In-stent restenosis
7. Planned percutaneous coronary intervention (PCI) within 3 months post procedure
8. Other stents implanted within 1 year
9. Severe heart failure (NYHA above III) or left ventricle ejection fraction (EF) <40%
10. Renal function damage, blood creatinine > 176.82 μmol/L
11. Bleeding tendency, active peptic ulcer disease, cerebral or subarachnoid hemorrhage, cerebral apoplexy within half year and contraindication for any anti-platelet or anticoagulation agents
12. Allergic to drugs or agents used in stent or protocol (PLGA, sirolimus, aspirin, clopidogrel, contrast agent, cobalt, nickel, chromium, iron, wolfram et. al.)
13. Life expectation < 12 months
14. Have not reached the primary end point when participating in other trial
15. Poor compliance to the protocol
16. Heart implantation cases