Reply to Letter to the Editor regarding "Oncological outcomes of squamous cell carcinoma of the cervical esophagus treated with definitive (chemo-)radiotherapy: a systematic review and meta-analysis"

In a previous study, we performed a meta-analysis of the oncological outcomes of patients suffering from cervical esophageal squamous cell carcinoma treated with definitive chemoradiotherapy. Further analysis was performed, and a random effect modeling showed a pooled local-regional failure rate of 41.4% (95% CI 32.2-50.8), and a pooled distant failure rate of 21.6% (95% CI 17.0-26.5). The included studies used a median radiotherapy (RT) dose of 61.2 Gy (95% CI 60.0-62.0, range 56.0-66.0), but we measured a non-significant impact of the RT dose on the pooled overall survival (OS), suggesting that an increased RT dose might not be related to an improved OS (p = 0.23). Further research should be conducted to define predictors and prognostic categories that may select the best treatment option for each patient.

Oncological outcomes of squamous cell carcinoma of the cervical esophagus treated with definitive (chemo-)radiotherapy: a systematic review and meta-analysis

PURPOSE

To determine the oncological outcomes of cervical esophageal squamous cell carcinoma (CESCC) treated with definitive chemoradiotherapy (CRT).

METHODS

A systematic review and meta-analysis was performed according to the PRISMA guidelines.

RESULTS

A total of 1222 patients (median age: 63.0 years, 95% CI 61.0-65.0) were included from 22 studies. The median follow-up time was 34.0 months (n = 1181, 95% CI 26.4-36.0). Estimated pooled OS rates (95% CI) at 1, 3, and 5 years were 77.9% (73.9-82.2), 48.4% (43.2-54.3), and 35.3% (29.7-41.9), respectively. The median OS (95% CI) was 33.4 months (25.8-42.2). Estimated pooled PFS rates (n = 595; 95% CI) at 1, 3, and 5 years were 64.1% (57.9-71.0), 38.0% (33.3-45.5), and 29.8% (23.9-37.1), respectively. The median PFS (95% CI) was 19.8 months (14.9-26.6).

CONCLUSIONS

Definitive CRT is a valuable first-line treatment for the management of CESCC. Further studies should focus on survival predictors able to define stage-based clinical guidelines.

Oncological outcomes of cervical esophageal cancer treated primarily with surgery: a systematic review and meta-analysis

PURPOSE

To determine the oncological outcomes of cervical esophageal cancer (CEC) treated primarily with surgery.

METHODS

A systematic review and meta-analysis was performed according to the PRISMA guidelines.

RESULTS

A total of 868 patients were included from 18 studies. Estimated pooled Overall Survival (OS) rates (95% Confidence Interval, CI) at 1 and 5 years were 74.4% (66.5-83.3), and 26.6% (20.3-34.7), respectively. Larynx non-preserving surgery (n = 229) showed an estimated pooled OS rates (95% CI) at 1 and 5 years of 59.3% (51.5-68.2) and 14.6% (8.8-24.3), respectively. On the other hand, larynx preserving surgery (n = 213) showed an estimated pooled OS rates (95% CI) at 1 and 5 years of 83.6% (78.2-89.4) and 35.1% (24.9-49.6), respectively.

CONCLUSIONS

Primary larynx-preserving surgery remains a valuable option for the management of CEC, with similar survival outcomes compared to primary chemoradiotherapy (CRT). On the other hand, larynx non-preserving surgery showed a significantly reduced survival, that may reflect the more advanced T classification of these tumors. Further studies are mandatory to directly compare primary surgery and primary CRT, distinguishing larynx preserving and non-preserving surgery.

Changes in the esophagogastric junction outflow obstruction manometric feature based on the Chicago Classification updates

BACKGROUND

The critical diagnostic criteria for esophagogastric junction outflow obstruction (EGJOO) were published in the latest Chicago Classification version 4.0 (CCv4.0). In addition to the previous criterion [elevated integrated relaxation pressure (IRP) in supine position], manometric diagnosis of EGJOO requires meeting the criteria of elevated median-IRP during upright wet swallows and elevated intrabolus pressure. However, with the diagnostic criteria modification, the change in manometric features of EGJOO remained unclear.

AIM

To evaluate the esophageal motility characteristics of patients with EGJOO and select valuable parameters for confirming the diagnosis of EGJOO.

METHODS

We performed a retrospective analysis of 370 patients who underwent high-resolution manometry with 5 mL water swallows × 10 in supine, × 5 in upright position and the rapid drink challenge (RDC) with 200 mL water from November 2016 to November 2021 at Peking University First Hospital. Fifty-one patients with elevated integrated supine IRP and evidence of peristalsis were enrolled, with 24 patients meeting the updated manometric EGJOO diagnosis (CCv4.0) as the EGJOO group and 27 patients not meeting the updated EGJOO criteria as the isolated supine IRP elevated group (either normal median IRP in upright position or less than 20% of supine swallows with elevated IBP). Forty-six patients with normal manometric features were collected as the normal high-resolution manometry (HRM) group. Upper esophageal sphincter (UES), esophageal body, and lower esophageal sphincter (LES) parameters were compared between groups.

RESULTS

Compared with the normal HRM group, patients with EGJOO (CCv4.0) had significantly lower proximal esophageal contractile integral (PECI) and proximal esophageal length (PEL), with elevated IRP on RDC (P < 0.05 for each comparison), while isolated supine IRP elevated patients had no such feature. Patients with EGJOO also had more significant abnormalities in the esophagogastric junction than isolated supine IRP elevated patients, including higher LES resting pressure (LESP), intrabolus pressure, median supine IRP, median upright IRP, and IRP on RDC (P < 0.05 for each comparison). Patients with dysphagia had significantly lower PECI and PEL than patients without dysphagia among the fifty-one with elevated supine IRP. Further multivariate analysis revealed that PEL, LESP, and IRP on RDC are factors associated with EGJOO. The receiver-operating characteristic analysis showed UES nadir pressure, PEL, PECI, LESP, and IRP on RDC are parameters supportive for confirming the diagnosis of EGJOO.

CONCLUSION

Based on CCv4.0, patients with EGJOO have more severe esophagogastric junction dysfunction and are implicated in the proximal esophagus. Additionally, several parameters are supportive for confirming the diagnosis of EGJOO.

Impaired Mucosal Integrity in Proximal Esophagus Is Involved in Development of Proton Pump Inhibitor-Refractory Nonerosive Reflux Disease

BACKGROUND AND OBJECTIVE

Weakly acidic reflux reaching to the proximal esophagus is closely related to the perception of gastroesophageal reflux in patients with nonerosive reflux disease despite treatment with a proton pump inhibitor (PPI). However, little is known about the involvement of the patients' mucosal integrity of the proximal esophagus.

METHODS

We recruited 15 symptomatic nonerosive gastroesophageal reflux disease (GERD) patients with a positive symptom index despite PPI treatment and 11 healthy asymptomatic volunteers as controls. The biopsy specimens obtained from the proximal and distal esophagus were applied to a mini-Ussing chamber system to measure transepithelial electrical resistance (TEER) against a pH 4 weak acid. The esophageal biopsy samples were subjected to quantitative real-time PCR and immunohistochemical analysis.

RESULTS

In the proximal esophagus, the weak acid exposure reduced the TEER in the PPI-refractory patients compared to that in the controls. The frequency of the reflux extending to the proximal esophagus had a significant correlation with the reduction in the proximal esophageal TEER in the patients. The reduced TEER in the proximal esophagus was accompanied by an increase in IL-8 and IL-1β mRNA and a decrease in occludin mRNA levels. The proximal esophageal mucosa in the patients presented infiltration of CD3-positive lymphocytes and an increased expression of solute carrier organic anion transporter family member 2A1 (SLCO2A1), a passage gate of reflux symptom-evoking molecules.

CONCLUSIONS

The reflux perception is related to an impairment of the proximal esophageal mucosal integrity in patients with nonerosive reflux disease despite PPI.