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Immunostain in short

S-100 staining in a secretory carcinoma of the salivary gland.
Use malignant melanoma, assess perineural invasion, undifferentiated malignancy
Normal staining pattern nucleus and cytoplasm
Positive benign: nerves, adipose tissue; tumour/other: granular cell tumour, Rosai-Dorfman disease; malignant: malignant melanoma, clear cell sarcoma, malignant peripheral nerve sheath tumour

S-100, also S100, is a commonly used immunostain. It marks nerves.


Malignant tumours

See also


  1. Mesquita, RA.; de Araújo, VC.; Paes, RA.; Nunes, FD.; de Souza, SC.. "Immunohistochemical analysis for CD21, CD35, Caldesmon and S100 protein on dendritic cells types in oral lymphomas.". J Appl Oral Sci 17 (3): 248-53. PMID 19466261.
  2. Shen, J.; Shi, Q.; Lu, J.; Wang, DL.; Zou, TM.; Yang, HL.; Zhu, GQ. (Dec 2013). "Histological study of chordoma origin from fetal notochordal cell rests.". Spine (Phila Pa 1976) 38 (25): 2165-70. doi:10.1097/BRS.0000000000000010. PMID 24296480.