Impact of Lymphatic and Venous Invasion Patterns on Postoperative Prognosis and Distant Metastasis in Esophageal Squamous Cell Carcinoma After Preoperative Chemotherapy.

BACKGROUND

Lymphovascular invasion (LVI) is reported to correlate with postoperative prognosis in esophageal squamous cell carcinoma (ESCC). However, reports analyzing lymphatic and venous invasion separately are rare, and no studies have examined the correlation in resected specimens after neoadjuvant chemotherapy (NAC). This study evaluated the postoperative prognosis and distant metastatic recurrence patterns in ESCC patients who underwent esophagectomy after NAC.

METHODS

This retrospective study analyzed 427 ESCC patients who underwent radical esophagectomy after NAC. The study examined the association of LVI patterns with postoperative overall survival (OS), recurrence-free survival (RFS), and distant metastasis-free survival (DMFS). The study also evaluated the correlation with postoperative distant metastasis patterns.

RESULTS

Multivariate analyses showed that patients with venous invasion (VI) alone had significantly worse OS (HR, 2.99; p < 0.001), RFS (HR, 2.92; p < 0.001), and DMFS (HR, 3.63; p < 0.001) than patients without LVI. Patients with both lymphatic invasion (LI) and VI had the worst OS (HR, 4.23; p < 0.001), RFS (HR, 3.38; p < 0.001), and DMFS (HR, 4.59; p < 0.001) among all groups. For the ypN0 patients, VI positivity was the only independent risk factor for DMFS (HR, 5.33; p < 0.001). Regarding distant organ metastasis, liver, brain, and bone metastasis were more frequently detected in patients with both LI and VI than in patients with other LVI patterns.

CONCLUSIONS

The study showed that ESCC patients treated with NAC who have resected specimens positive for VI, especially those also with positive lymphatic invasion, have a worse postoperative prognosis and a higher risk for postoperative distant metastases than those without LVI. More aggressive postoperative adjuvant therapy may be suitable for improving the prognosis of such patients.