Objective To explore feasibility and clinical value of low dose computed tomography perfusion imaging (CTPI) in quantitative assessing proximal gastric cancer. Methods A total of 34 patients diagnosed with proximal gastric cancer (a proximal gastric cancer group) were enrolled prospectively in this study. The 25 normal parts of gastric fundus of the included patients constituted a control group. All the patients underwent the low dose CTPI before surgery. The total effective radiation dose was recorded, and a specific post-processing software was used to automatically generate the perfusion parameters values, including the time to peak (TTP), blood flow (BF), blood volume (BV), mean transmit time (MTT), and permeability (PMB). The perfusion parameters in the different histopathologic types and stages of the patients were compared. Receiver operating characteristic (ROC) curves were generated to compare their diagnosis performances. Results The histopathologic findings verified that there were 11 patients with T1+T2 stage and 23 patients with T3+T4 stage; 8 patients with signet ring cell carcinoma and 26 patients with adenocarcinoma; and 17 patients with lymphatic metastasis and 17 patients without lymphatic metastasis. ① Compared with the control group, the BF, BV, and PMB values were significantly higher and the MTT and TTP values were significantly lower in the proximal gastric cancer group. The area under the ROC curve (AUC) values of the BF, BV, PMB, MTT, and TTP in the diagnosing proximal gastric cancer was 0.955, 0.807, 0.987, 0.654, and 0.649 respectively. The BF and PMB represented the best diagnostic performances, and the BV was secondary in the ROC curve results. ② The BF value was significantly lower and the PMB value was significantly higher in the patients with signet ring cell carcinoma as compared with the patients with adenocarcinoma. However, the BV, MTT, and TTP values had no significant differences in both them. And the BF (AUC=0.986) had a better ability than the PMB (AUC=0.856) in the discriminating the histopathological type (P=0.047). ③ The PMB value in the patients with pathological stage T3 and T4 was significantly higher than that of the patients with pathological stage T1 and T2 (P=0.004), but the BF, BV, MTT, and TTP values had no differences in both them. The diagnosis value of the PMB in the discriminating the pathological stage was good with an AUC value of 0.814. ④ None of the parameters had significant difference between the patients with and without lymphatic metastasis (P>0.05). ⑤ The total effective radiation dose of each scan was 8.58 mSv, which was lower than that of the standard radiation dose of CTPI. ⑥ The rates of lymphatic metastasis and high T staging were not related to the histopathological type of the proximal gastric cancer (P>0.05). Conclusion Low dose CTPI used in this study could effectively reduce radiation dose, could quantitatively evaluate angiogenesis in proximal gastric cancer, and has a certain clinical value in identifying of histopathological type and evaluating of pathological stage.
ObjectiveTo investigate the application of three methods about digestive tract reconstruction in radical resection for proximal gastric cancer.MethodsWe retrospectively reviewed the cases of 130 proximal gastric cancer patients who underwent double tract reconstruction (TD, 35 cases), total gastrectomy (TG, 50 cases) and esophagogastrostomy (EG, 45 cases) from Jan. 2016 to Oct. 2018 in Gastrointestinal Surgery Department in our Hospital.ResultsThere were no significant differences in basic data of patients, preoperative nutritional status, hemoglobin content, postoperative recovery time of gastrointestinal function, hospitalization time and early postoperative complications among the three groups (P>0.05). But the operative time, intraoperative bleeding volume, postoperative status of total protein, albumin, hemoglobin, late complications, reflux symptoms, gastro-intestinal quality of life index (GIQLI) between the three groups had statistically significant differences (P<0.05). The operative time of EG was (161.80±30.77) min, which was the shortest. The intraoperative bleeding volume of TG was (107.20±10.70) mL, which was the most. At 6 months after TG, the total protein, albumin and hemoglobin were (62.15±6.72) g/L, (36.14±6.57) g/L and (112.68±16.97) g/L, respectively, which were the lowest level among the three groups. There late complications of the EG were the most serious, in which the Visick score was 46 and the GIQLI index was 103.56±22.01. The above differences were statistically significant (P<0.05).ConclusionsDT performs better in anti-reflux, maintenance of postoperative nutrition, and anti-anemia, but the occurrence of remnant gastric cancer is a potential risk. TG has a lot of bleeding, as well as the performance of postoperative nutrition and anti-anemia is not good, but it can avoid the occurrence of remnant gastric cancer. The operative time of EG is short, but reflux symptoms are more likely to occur after surgery, and the quality of life is bad.