Background: Currently, optimal treatment strategy for resectable primary small cell carcinoma of the esophagus (PSmCCE) remains controversial. To address this, we conducted a multicenter study to evaluate treatment patterns and long-term survival of PSmCCE patients who underwent radical resection.
Methods: This retrospective multicenter study included resected PSmCCE patients who received radical resection at seven high-volume cancer centers. Overall survival (OS) and median survival time (MST) were calculated by using a Kaplan-Meier method and the log-rank test was utilized to assess differences. Multivariable Cox analysis was performed to identify independent prognostic factors.
Results: A total of 352 patients with resected PSmCCE were included. For PSmCCE with stage cT1-2N0M0, patients who received surgery plus adjuvant therapy showed better survival than those who received surgery alone (5-year OS rate: 32.8% vs. 19.2%, MST: 44.0 vs. 33.0 months, P = 0.035). Multivariable Cox survival analysis revealed an independent correlation between receiving surgery plus adjuvant therapy and improved OS (hazard ratio [HR] 0.529; 95% confidence interval [CI] 0.280-0.997; P = 0.049). For stage cT3N0M0/T1-3N1M0 PSmCCE, patients who received neoadjuvant therapy followed by surgery had superior long-term survival compared with those who received surgery combined with adjuvant therapy and those who received surgery alone (5-year OS rate: 27.2% vs. 9.5% vs. 0%, MST: 36.0 vs. 24.0 vs. 20.0 months, P = 0.014). Multivariable Cox survival analysis showed that neoadjuvant therapy was independently associated with improved OS (HR 0.384, 95% CI 0.203-0.728; HR 0.550, 95% CI 0.312-0.968; P = 0.013).
Conclusions: Adjuvant therapy was associated with improved survival in stage cT1-2N0M0 PSmCCE, but this should be confirmed in prospective studies. For stage cT3N0M0/T1-3N1M0 cases, neoadjuvant therapy followed by surgery should be considered.
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