Major salivary gland carcinoma in KSA: A 10-year nationwide retrospective study of 571 cases

OBJECTIVES: Major salivary gland carcinoma (MSGC) comprises a morphologically diverse group of rare tumours with different clinical behaviours, and epidemiology findings in the literature substantially vary by geographic location. The aim of this study was to conduct a comprehensive analysis of the incidence rates, anatomical sites, and histological subtypes of different salivary gland malignancies in the population of KSA. METHODS: This retrospective cohort study included patients diagnosed with MSGC in KSA from 2008 to 2017, on the basis of the demographic characteristics and histological data retrieved from the Saudi Cancer Registry database. Malignant lesions were identified according to the International Classification of Diseases for Oncology, Third Edition (ICD-O-3) codes. RESULTS: Salivary gland malignancies were diagnosed in 571 patients (50.10% males and 49.90% females) over the course of 10 years. The parotid gland was the site of origin in 69.9% of cases. The most common histological type was mucoepidermoid carcinoma (29.1%). Over a decade, the incidence rate ranged from (0.15–0.24) per 100,000 inhabitants. The peak incidence of salivary gland malignancies was observed in the fourth, fifth, and sixth decades of life (17.5%, 18.2%, and 16.8%, respectively). CONCLUSION: Compared with that in other parts of the world, the incidence of MSGC is significantly lower in KSA, with 0.15–0.24 cases per 100,000 people each year. However, the clinical manifestations of carcinoma of the salivary glands in KSA are similar to those described worldwide.