On the other hand, old age has a highly significant interaction with survival time but not with cured fraction, suggesting the possibility that rate of metastatic proliferation, rather than the occurrence of metastasis, increases substan- tially with increasing age at diagnosis.
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Squamous carcinoma of the head and neck: cured fraction and median survival time as functions of age, sex, histologic type, and node status.
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The sentences
Patient sex was also related to likelihood of cure, but this association was of marginal significance.