 (*n* = 000)                                                                                                                   Fit (≥00 mL/min./0.00 m^0^)                            00 (00%)                           00 (00.0%)                         0.0000     Cisplatin-unfit (\<00 mL/min./0.00 m^0^)               00 (00%)                           000 (00.0%)                           **Primary site at the initiation of chemotherapy**                                                                                 Resected                                                00 (00.0%)                         00 (00%)                           0.0000    Not resected                                            00 (00.0%)                         00 (00%)                              **Metastatic site**                                                                                                                Lymph node                                              00 (00%)                           000 (00.0%)                        0.000    Lung                                                    00 (00%)                           00 (00.0%)                         0.0000    Bone                                                    00 (00.0%)                         00 (00.0%)                         0.0000    Liver                                                   0 (00.0%)                          00 (0.0%)                          0.0000    Local recurrence                                        0 (0.0%)                           00 (0.0%)                          0.0000   **Visceral metastasis (lung, liver, or bone)**                                                                                     Yes                                                     00 (00.0%)                         00 (00%)                           0.0000    No                                                      00 (00.0%)                         00 (00%)                              **Single organ metastasis**                              00 (00%)                           000 (00%)                          0.000   **Response after first-line chemotherapy**                                                                                         CR                                                      0 (00.0%)                          00 (00.0%)                         0.0000    PR                                                      00 (00%)                           00 (00.0%)                             SD                                                      00 (00.0%)                         00 (00.0%)                             PD                                                      0 (0%)                             00 (00.0%)                             Unknown                                                 0                                  0 (0.0%)                             