In patients with unprotected left main (LM) true bifurcation lesion (cohort A), elective 2-stent strategy is superior to provisional strategy at preventing the occurrence of 12-month target lesion failure after percutaneous coronary intervention for bifurcation lesion.

In patients with unprotected LM non-true bifurcation lesion (cohort B), 1-stent technique with mandatory final kissing ballooning is superior to 1-stent technique without kissing ballooning at preventing the occurrence of 12-month target lesion failure after percutaneous coronary intervention for bifurcation lesion.

Inclusion Criteria:

1. Age ≥20 years
2. Left main bifurcation lesion on coronary angiography
3. Significant myocardial ischemia Main vessel (left main coronary artery and left anterior descending artery) and/or side branch (left circumflex artery) diameter stenosis > 75%, or diameter stenosis 50-75% with angina and/or objective evidence of ischemia in the non-invasive stress test
4. Significant size of the main branch (left anterior descending artery) and side branch (left cirmflex artery) - The reference diameter of both branches ≥ 2.5 mm by visual estimation

Exclusion Criteria:

1. The patient has a known hypersensitivity or contraindication to any of the following medications: Heparin, Aspirin, Clopidogrel, Biolimus
2. Patients who have received DES implantation in the target lesion prior to enrollment