Assessment of follow-up, and the completeness and accuracy of cancer case ascertainment in three areas of India

作者：Mathew Aleyamma^*; Daniel Carrie R; Ferrucci Leah M; Seth Tulika; Devesa Susan S; George Preethi S; Shetty Hemali; Devasenapathy Niveditha; Yurgalevitch Susan; Rastogi Tanuja; Prabhakaran Dorairaj; Gupta Prakash C; Chatterjee Nilanjan; Sinha Rashmi

来源：Cancer Epidemiology, 2011, 35(4): 334-341.

DOI：10.1016/j.canep.2011.03.006

• Cancer
• End-point
• Follow-up
• Registry
• Prospective cohort
• India

Background: A prospective study of diet and cancer has not been conducted in India; consequently, little is known regarding follow-up rates or the completeness and accuracy of cancer case ascertainment. Methods: We assessed follow-up in the India Health Study (IHS; 4671 participants aged 35-69 residing in New Delhi, Mumbai, or Trivandrum). We evaluated the impact of medical care access and relocation, recontacted the IHS participants to estimate follow-up rates, and conducted separate studies of cancer cases to evaluate registry coverage (604 cases in Trivandrum) and the accuracy of self- and proxy-reporting (1600 cases in New Delhi and Trivandrum). Results: Over 97% of people reported seeing a doctor and 85% had lived in their current residence for over six years. The 2-year follow-up rate was 91% for Trivandrum and 53% for New Delhi. No cancer cases were missed among public institutions participating in the surveillance program in Trivandrum during 2003-2004; but there are likely to be unmatched cases (ranging from 5 to 13% of total cases) from private hospitals in the Trivandrum registry, as there are no mandatory reporting requirements. Vital status was obtained for 36% of cancer cases in New Delhi as compared to 78% in Trivandrum after a period of 4 years. Conclusions: A prospective cohort study of cancer may be feasible in some centers in India with active follow-up to supplement registry data. Inclusion of cancers diagnosed at private institutions, unique identifiers for individuals, and computerized medical information would likely improve cancer registries.

• 出版日期2011-8
• 单位河北医科大学