      Tumor size                                                                          0 -- 00 mm                                                                      00.0 ± 00.0 (00 -- 000)    00-mm                                                                          000.0 ± 00.0 (00 -- 000)    *P* value                                                                      *P* \< 0.0000   Histologic type                                                                     Differentiated type adenocarcinoma                                              00.0 ± 00.0 (00 -- 000)    Undifferentiated type adenocarcinoma                                           000 ± 000.0 (00 -- 000)    *P* value                                                                      *P* \< 0.00   Location                                                                            Lower                                                                           00.0 ± 00.0 (00 -- 000)    Middle                                                                         000.0 ± 00.0 (00 -- 000)    Upper                                                                          000.0 ± 00.0 (00 -- 000)    *P* value                                                                      *P* \< 0.0000   Indication criteria                                                                 Absolute indication group                                                       00.0 ± 00.0 (00 -- 000)    Expanded indication group                                                      000.0 ± 00.0 (00 -- 000)    Exclusion indication group                                                     000.0 ± 00.0 (00 -- 000)    *P* value                                                                      *P* \< 0.0000   ------------------------------------------------------------------------------- --------------------------  