Study to Compare a Mono Atezolizumab Window Followed by a Atezolizumab - CTX Therapy with Atezolizumab - CTX Therapy

840 mg Day 1 for two weeks

1200 mg Day 1 every 3 weeks for 8 cycles

Dosing according to Area Under the Curve of 2 Intravenous weekly x 12 cycles

Paclitaxel 80 mg/m² IV weekly x 12 cycles

90 mg/m2, day 1 for 4 cycles (12 weeks)

600 mg/m2, day 1 for 4 cycles (12 weeks)

1st Biopsy two weeks after Baseline visit. 2nd Biopsy after two weeks of Carboplatin + Paclitaxel + Atezolizumab therapy. 3rd Biopsy with tumor size greater 10 mm in diameter.

1st Biopsy after two weeks of Carboplatin + Paclitaxel + Atezolizumab therapy. 2nd Biopsy with tumor size greater 10mm in diameter.

After completion of 27-28 weeks (Arm B) or 29-30 weeks (Arm A) of neoadjuvant treatment, surgery is planned for all patients.