Hoogenhout J, Jerusalem C R, van Gasteren H, Kal H B
Department of Radiotherapy, Sint Radboud University Hospital, Nijmegen, The Netherlands.
Strahlenther Onkol. 1988 May;164(5):300-6.
Xenografts of both primary human laryngeal squamous cell carcinoma and its metastases were irradiated with five daily fractions of 5.0 Gy. Tumor volume changes, morphology, mitotic index and mitotic figures were studied. Primary xenografts disappeared within 17 +/- 3 days. Grafts of metastases showed complete regression within 26 +/- 5 days, or regrowth after a delay period. Mitotic activity was higher in the grafts of metastases. The number of mitotic figures decreased and ceased within 14 days in the primary tumor, while some were still occasionally noted in the grafts of metastases. Telophase stages were practically absent after the first fraction. This study suggests that the response of metastases to radiation therapy is lower than the response of the primary tumor.
