Is there a cure available for coronary artery disease?

Strictly speaking, . No. But there are many modalities that are preventive and/or therapeutic.
Management. While there is no complete cure for CAD everyone can manage their disease. Stop smoking, lose weight: BMI <28, very healthy low fat diet (some suggest an anti-inflammatory diet), exercise, control diabetes/check blood sugar, regular check ups to review cholesterol, bp, sugar, BMI in check and take medications as prescribed.