Table 4 Multivariate analysis of prognostic factors related to overall survival (OS) and progression-free survival (PFS)

PFS

Double agent

0.821

0.5–1.347

0.435

Single agent

1

Stage II and III

1.444

1.137–1.834

0.003

Stage I

1

Radiotherapy dose 50–60 Gy

0.801

0.471–1.365

0.415

Radiotherapy dose >60Gy

1

Age < 65 years

0.679

0.418–1.103

0.118

Age ≥ 65 years

1

Female

0.541

0.290–1.01

0.054

Male

1

OS

Double agent

0.669

0.301–1.397

0.437

Single agent

1

StageII and III

1.607

1.146–2.253

0.006

Stage I

1

Radiotherapy dose 50–60 Gy

0.935

0.452–1.937

0.857

Radiotherapy dose >60Gy

1

Age < 65 years

0.845

0.425–1.678

0.630

Age ≥ 65 years

1

Female

0.692

0.301–1.589

0.385

Male

1