Malignant Salivary Gland Tumors in a Tertiary University Hospital in Northern Spain.

(1) Background: Salivary gland tumors (SGTs) are a rare and diverse group of neoplasms arising in the parotid, submandibular, sublingual, and minor salivary glands distributed throughout the upper aerodigestive tract. Given the rarity and complexity of MSGTs, understanding their epidemiology across diverse populations is crucial for improving diagnostic and therapeutic strategies. (2) Methods: A retrospective analysis involving 45 patients diagnosed with malignant salivary gland tumors and treated with curative intention between 1 July 2016 and 1 July 2021 in a tertiary academic hospital was performed. (3) Results: Histologically, the most common subtype was adenoid cystic carcinoma in 12 (26.7%) cases, followed by carcinoma ex-pleomorphic adenoma in 7 (15.6%) cases, mucoepidermoid carcinoma in 6 (13.3%) cases, and adenocarcinoma in 6 (13.3%) cases. The majority of tumors were located in the parotid gland in 28 cases (62.2%). The three-year overall survival rate was 80% and the three-year specific survival rate was 86.7%. Tumor grade was significantly associated with local recurrence and the appearance of distant metastasis during the follow-up period (p = 0.04). We also evidenced a worse survival in patients with advanced T-Stage (p = 0.038) and positive nodes in the neck (p = 0.015). (4) Conclusions: Overall, our study reinforces the prognostic significance of tumor grade, T-Stage and N-Stage while challenging the conventional understanding of factors such as PNI, LNM, and margin status.