Objective To investigate the feasibility of new criteria for evaluating the radiotherapeutic effect on esophageal cancer by barium meal (BM) combined with CT scans.
Methods A total of 189 patients who were diagnosed with esophageal cancer (confirmed by biopsy) from January 2004 to December 2010 were enrolled as subjects. All patients underwent BM and CT scans before and after radiotherapy. The maximal esophageal wall thickness (EWT) and changes in the volumes of regional lymph nodes measured by CT scans were analyzed. New criteria for evaluating the short-term radiotherapeutic effect on esophageal cancer was studied considering the analysis results as well as the BM-based criteria for evaluating short-term radiotherapeutic effect and follow-up results.
Results The BM-based evaluation criteria were still useful, but had certain limitations. There were 115 patients who had regional lymph node metastasis as detected by CT scans before radiotherapy, and they were divided into complete remission (CR) group and partial remission (PR) group according to BM results after radiotherapy;the local control rate (LCR) of CR group was significantly higher than that of PR group, but there was no significant difference in survival rate (SR) between the two groups. There were 65 patients who had no regional lymph node metastasis, and they were also divided into CR group and PR group according to BM results after radiotherapy;the LCR and SR of CR group were significantly higher than those of PR group. In summary, the patients who had a CR as evaluated by BM and had the maximal EWT of ≤1.20 cm and the volumes of residual lymph nodes of ≤1.00 cm³ on CT were defined as CR;the patients who had a PR as evaluated by BM or had the maximal EWT of>1.20 cm or those who had a CR evaluated by BM and had the maximal EWT of ≤1.20 cm and the volumes of residual lymph nodes of>1.00 cm³ on CT were defined as PR. The cases evaluated by BM as no remission (NR) or showing metastasis were defined as NR or progressive disease. There were significant differences in LCR and SR between the CR group and PR group determined by the new criteria.
Conclusions Simply using BM to evaluate the short-term radiotherapeutic effect on esophageal cancer has certain limitations;instead, the evaluation based on both BM and CT scans is more accurate.