- Korshunov A, Golanov A. Immunohistochemical analysis of p18INK4C and p14ARF protein expression in 117 oligodendrogliomas: correlation with tumor grade and clinical outcome. Arch Pathol Lab Med. 2002;126:42-8 pubmed..p18 protein expression is closely associated with malignant oligodendrogliomas and worse clinical outcome. It seems unlikely that p14 immunohistochemistry will be of value in assessing individual prognosis for these tumors. ..