Surgical Management of Patients with Distant Metastasized Adenoid Cystic Carcinoma of the Head and Neck.

Background : Adenoid cystic carcinoma (ACC) is a rare and malignant tumor of the salivary glands. Despite its slow-growing nature, this clinical entity is notorious for presenting with distant metastasis (DM) which significantly worsens patient outcomes. The role of surgery in patients with ACC and distant metastasis (DM) remains controversial. Methods : We conducted a retrospective analysis of 47 patients with ACC who underwent surgery for the primary tumor and presented with DM at baseline or developed DM during follow-up. We compared survival outcomes between patients with DM at baseline (Group A) and those who developed DM during follow-up (Group B). Results : The median overall survival (OS) for the entire cohort was 88%. Patients with DM at baseline (Group A) had significantly worse OS (51%) compared to those without DM at baseline (Group B) (91%; p=0.04). Local recurrence (LR) was associated with poor survival in both groups. However, salvage surgery for LR+DM was associated with improved OS compared to palliative treatment (100% vs 77%; p=0.79). Conclusion : Our findings suggest that surgery for the primary tumor of ACC may provide survival benefits in patients with DM. Salvage surgery should be considered particularly for patients who develop local recurrence and distant metastasis during follow-up.