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This retrospective study used data from Swedish patients compiled in three registries by the National Board of Health and Welfare, Stockholm, Sweden (Table 1).
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In situ carcinomas were missing in a few pre-screening years in two registries.
In eight registries data was actively recorded on a specific standard disaster form.
In this paper, we analyzed the mortality-incidence ratios (M I ratio) in two registries (Table 1).
These were tumour identification code, number of tumours, postal district, and a variable indicating whether the tumour was registered in two registries.
The percentage of cases registered from death certificate only in six registries in Japan was compared with that in the registries in the United States, indicating that the completeness of registration was yet unsatisfactory in Japan.
We analyzed a total of 907 cases of laryngeal cancer treated by three treatment methods: radiation and surgery (248 patients), radiation alone (345 patients), and surgery alone (314 patients), registered in two registries, Connecticut and Metropolitan Detroit, from 1973 1977 with known survival status up to 1999 extracted from the SEER database.
The median number of participants per study in the three registries ranged between 63 and 155.
Therefore, we did not contact the investigators for trials in these three registries.
Characteristics are not corrected for different registration thresholds in the three registries.
SIR estimates for HR-mixed second primary after HR-mixed FBC were elevated in all three registries.
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