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We examined in NORDCAN database how the annual age group-specific incidence rates (IR) of gastric cancer (GCA), and correspondingly the GCA risk, have declined in Finland during the twentieth century, and whether this decline corresponds to a decrease in the cohort-specific prevalence rate of  Helicobacter pylori  (Hp) gastritis that is considered an important precancerous risk condition for GCA. In modelling with partial least squares regression (PLSR), the logarithmically transformed IRs (ln(IR) of GCA were well explained with age and birth cohort as explanatory model variables. By considering the observed (actual) and the PLSR-modelled IRs, the IR of GCA (and the risk of GCA) has decreased gradually in Finland from 1900 onward, cohort by cohort. By prediction of the future with PLSR, the IRs of GCA will be markedly lower in all cohorts during the twenty-first century than in the twentieth century. By PLSR modelling, less than 10 GCA cases per 100,000 people are predicted to appear annually in cohorts (generations) born at the turn of the 20th and 21st centuries, even when these people will be 60–80 years old in the years 2060–2070. The IR of GCA and GCA risk progressively declined by cohort in Finland during the whole twentieth century. This decline corresponds in extent and time window to earlier observations in the decline of the prevalence rate of Hp gastritis in the same birth cohorts and supports the hypothesis of the role of Hp gastritis as an important risk condition of GCA.

scandinavian journal of gastroenterology

Risk of gastric carcinoma will be low in generations born at turn of the 20 th  and 21 st  centuries in Finland. Modelling NORDCAN data of the age group specific incidence rates of gastric cancer with PLS-regression and with attention to age (‘age effect’) and year of the birth (‘cohort effect’)