Univariate analysis showed significantly positive correlations for growth type, mitosis, perineural invasion, vascular invasion, lymphatic invasion, depth, thickness, and infiltration growth ratio. Multivariate analysis had a significantly positive correlation with nest formation and depth in all patients, and with thickness in patients with T1 or T2. In patients with bilateral cervical lymph node metastasis, lymph node metastasis was significantly positively correlated with perineural invasion.

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Although the importance of follow-up and detailed examinations following the detection of abnormalities in thorough routine health checks is recognized extensively, marked interfacility variances are seen in the percentage of individuals advised to receive detailed examination, the percentage of individuals who actually receive the recommended detailed examination and the results of detailed examination. On the basis of the survey data collected by the Clinical Preventive Medicine Committee of the Japanese Association of Hospitals and the data collected during thorough routine health checks at our facility, we analyzed the percentage of individuals who were rated as requiring detailed examination and the percentage who actually received the recommended detailed examination, and found that these percentage varied greatly between different facilities. To minimize interfacility differences in these percentages; it seems necessary to review the criteria currently used for evaluation of health check data at individual facilities. To this end, we must discuss quantitative test data and data yielded by diagnostic imaging separately.