Cancer registration in Iceland for 70 years - incidence, mortality and survival

Abstract

The Icelandic Cancer Registry (ICR) was founded seventy years ago by the Icelandic Cancer Society. In 2007 the ICR became one of the health registers of the Directorate of Health. In this paper we present cancer incidence, mortality, and survival in Iceland over 70 years. The ICR receives information on cancer diagnoses from histopathological laboratories, the Hospital Discharge Registry and the Cause of Death Registry. Iceland participates in the Nordic cancer database NORDCAN. Because of the small population size, random variation in numbers is very prominent. Therefore, data from ICR are published as five-year averages. For all malignancies combined, age-standardized incidence (ASI) in men rose steadily until around 15 years ago when a decline started. This is in line with prostate- and lung cancer incidence trends. In women, the ASI was lower than in men, but it is still on the rise despite declining lung cancer incidence. ASI for breast cancer, the most common cancer in women, is increasing. Simultaneously, cancer mortality for both sexes has declined in recent years and cancer survival is improving. Population-based cancer registration for over 70 years makes it possible to monitor the epidemiology of cancer in Iceland and compare with other countries. The changes in trends in ASI are in line with changes of cancer risk factors and diagnostic policy. The decline in cancer mortality and improvement in survival reflects advances in cancer treatment as well as effects of early detection and prevention.