Tumor microenvironment in salivary gland carcinomas: An orchestrated state of chaos

Salivary gland carcinomas (SGC) are rare tumors of heterogeneous morphology and many histological subtypes. Like other tumors, the SGC mass consists of a varied population of malignant cells and a diverse array of immune cells, cancer-associated fibroblasts, cytokines, chemokines, extracellular matrix proteins, and metalloproteinases, collectively known as the tumor microenvironment (TME). This chaotic network serves as an important physical mediator of cancer cell growth. In this review, we provided current insights into the TME of some of the most common SGC. Here, we highlighted the histological heterogeneity of these tumors, delineated the nature/intensity of inflammatory infiltrates, and the mechanisms involved in immunological escaping related to each SGC subtype.