Photoablative atherectomy followed by a paclitaxel-coated balloon to inhibit restenosis in instent femoro-popliteal obstructions (PHOTOPAC).

Background: To evaluate the safety and effectiveness of preparing instent femoropopliteal lesion with photoablative laser atherectomy or plain balloon angioplasty (POBA) prior to drug-coated balloon (DCB) angioplasty. Patients and methods: The prospective, multicenter, randomized study enrolled patients with Rutherford-Becker-class (RBC) 1 to 5 and instent lesions located in superficial femoral artery and/or popliteal artery above the knee joint. Primary endpoint was target lesion percent stenosis at 1 year as determined by the angiographic core-laboratory. Secondary endpoints included procedural success, major adverse event rate, clinical improvement and improvement in ankle-brachial index (ABI), clinically-driven target lesion revascularization (CD-TLR), and primary patency rate at until 2-year follow-up. Results: The study was terminated prior to the enrollment goal due to slow enrollment. Thirty patients were included in the laser plus DCB cohort and 31 patients in the control cohort. Primary endpoint was not significantly different (p=0.331). Procedural success was 83.3% and 87.1% for the laser plus DCB and the control cohort, respectively. Serious adverse events at 30 days and 1-year were not statistically different between the two cohorts. For the ABI, significant improvements were present at discharge as well as at the follow-up visits. This was also evident for the RBC at the follow-up visits. One- and two-year freedom from CD-TLR was 86.7% vs. 87.1%, and 63.6% vs. 72%, respectively. Duplex derived primary patency was 90% at 6-months, 65.5% at one year and 56.5% at two year for the laser cohort and 90.3%, 75.9% and 53.8% for the control cohort. Conclusions: Safety of instent photoablative laser atherectomy followed by DCB angioplasty is confirmed by this study. Due to the small sample size, no benefit over POBA as vessel preparation could be shown.