Adverse events

In chemotherapy phase (CP),based on investigator's decision,participants received either:paclitaxel 175 milligrams per square meter (mg/m2) intravenous (IV) infusion,followed by carboplatin dose at area under curve (AUC) 5 or 6,IV infusion (carboplatin dose (mg) = Target AUC (mg\*min/mL) x (glomerular filtration rate\[GFR\] mL/min + 25),and maximum carboplatin dose = target AUC x (150 mL/min) on Day 1 of Cycles 1 to 6; or Paclitaxel 80 mg/m2 IV infusion over 1 hour on Days 1, 8, and 15, along with carboplatin dose at AUC 5 or 6, IV infusion over 1 hour on Day 1 of Cycle 1 to 6 (1 cycle=21 days). After completion of CP, participants without evidence of disease progression, received avelumab 10 mg/kg, over 1 hour IV infusion,once every 2 weeks on Days 1, 15, and 29 (1 cycle=42 days) in maintenance phase (MP) until confirmed progressive disease,unacceptable toxicity, or withdrawal of consent, or a maximum duration of 24 months. Participants were then followed up to a maximum of 36 months.

In CP, based on investigator's decision, participants received either:paclitaxel 175 mg/m2,IV,followed by carboplatin dose at AUC 5 or 6,IV (carboplatin dose \[milligrams\](mg) = Target AUC (mg\*min/mL) x GFR mL/min + 25),and maximum carboplatin dose = target AUC x (150 mL/min) on Day 1 of Cycles 1 to 6;or Paclitaxel 80 mg/m2 IV infusion over 1 hour on Days 1, 8, and 15, along with carboplatin dose at AUC 5 or 6, IV infusion over 1 hour on Day 1 of Cycle 1 to 6 along with Avelumab 10 mg/kg administered as a 1-hour IV infusion once every 3 weeks for Cycle 1 to 6 ( 1 cycle=21 days).After completion of CP, participants without evidence of disease progression, received Avelumab IV, 10 mg/kg, once every 2 weeks on Days 1, 15, and 29 ( 1 cycle=42 days) in MP until confirmed progressive disease (PD), unacceptable toxicity, or withdrawal of consent, or a maximum duration of 24 months. Participants were then followed up to a maximum of 36 months.

In CP, based on investigator's decision, participants received either: paclitaxel 175 mg/m2, IV infusion, followed by carboplatin dose at AUC 5 or 6, IV infusion (carboplatin dose \[milligrams\](mg) = Target AUC \[milligrams\*minute per milliliter\] (mg\*min/mL) x GFR mL/min + 25), and maximum carboplatin dose = target AUC x (150 mL/min) on Day 1 of Cycles 1 to 6; or Paclitaxel 80 mg/m2 IV infusion over 1 hour on Days 1, 8, and 15, along with carboplatin dose at AUC 5 or 6, IV infusion over 1 hour on Day 1 of Cycle 1 to 6. Each cycle was of 21 days (3 weeks). After completion of CP, participants were followed for survival status until death or until study completion, whichever was earlier or a maximum duration of 24 months in observation phase. Participants were then followed up to a maximum of 36 months.