Most tumours of the salivary glands will be diagnosed with simple H-E stains but there are times when IHC will be help with diagnosis e.g poorly differentiated lesion.The following article deals with this topic:
Nagao, T., Sato, E., Inoue, R., Oshiro, H., H. Takahashi, R., Nagai, T., … Matsubayashi, J. (2012). Immunohistochemical Analysis of Salivary Gland Tumors: Application for Surgical Pathology Practice. Acta Histochemica et Cytochemica, 45(5), 269–282. doi:10.1267/ahc.12019