      Tumor size                                                                          0 -- 00 mm                                                                     000/000 (00.0 %)    00-mm                                                                           00/00 (00.0 %)    *P* value                                                                      *P* \< 0.0000   Histologic type                                                                     Differentiated type adenocarcinoma                                             000/000 (00.0 %)    Undifferentiated type adenocarcinoma                                           