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Over a 19 year period since 1962, 972 cases of cervical cancer have been detected by mass screening in Miyagi Prefecture, a detection rate of 0.11%. Among these cases, 551 (56.7%) were cases of carcinoma in situ. In contrast, cervical cancers detected by means of private screening gave a detection rate of 0.39% (889 cases), among which there were 611 cases of invasive carcinoma (68.7%). Among the 421 cases of invasive carcinoma detected by mass screening, 352 were Stage I, 52 were Stage II, 14 were Stage III and 1 was Stage IV. Moreover, 178 of the 352 Stage I cases were Stage Ia. The 5 year survival rate for the cervical cancer patients detected by mass screening was 97.8% for Stage 0, 92.9% for Stage I, 75% for Stage II, 45.5% for Stage III and 0% for Stage IV. The 5-year survival rate for invasive carcinoma was 88.7%. Twenty-five deaths due to recurrence of the cancer were found, but all such cases were invasive carcinomas. There were no mortalities due to recurrence of carcinoma in situ among such cases detected by mass screening.
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