[en] A correlation between the Ki-67 positive fraction (KPF) of tumor cell obtained by immunohistochemical staining using Ki-67 monoclonal antibody and local tumor control was estimated in the eighteen cases with head and neck carcinoma that were treated with radical, external radiotherapy. There was a tendency that local tumor control was slightly better in the cases with lower KPF, and especially good in the cases with lower KPF and shorter overall treatment time, although it was not statistically significant. A predictive value of KPF for local tumor control by radiotherapy is expected. However, a further clinical estimation with a large number of patients should be performed to have a definitive conclusion. (author)