Tax First-line Chemotherapy With Different Doses and Then Maintenance Therapy

The study consists in: * A first line treatment phase: participants receive 4 cycles of chemotherapy (each cycle contains 3 weeks) with either docetaxel (75 mg/m2) plus cisplatin (75 mg/m2) or docetaxel (60 mg/m2) plus cisplatin (75 mg/m2) , * A maintenance treatment phase: participants with disease control (complete response \[CR\], partial response \[PR\] or stable disease \[SD\]) after the initial treatment receive up to 6 cycles of chemotherapy with docetaxel (60 mg/m2) or best supportive care (BSC). * A follow-up period from the end of study treatment until participant death or end of study.