Evaluation of the Cancer Transition Theory in the US, Select European Nations, and Japan by Investigating Mortality of Infectious- and Noninfectious-Related Cancers, 1950-2018

Key Points

Question

As nations develop, do they experience a systematic pattern in cancer trends by type, distinguishing between infectious-related and noninfectious-related cancers?

Findings

This cross-sectional study of 6 countries’ cancer mortality data from 1950 to 2018 found that a crossover in trends between the 2 main types of cancers (infectious-related and noninfectious-related) took place around 1990 in Japan and in the mid-1950s in Norway. For the other countries in the study, the trends in the 2 types of cancers do not intersect as they do for Japan and Norway, but those other nations still exhibit a cancer transition with declining rates of infectious-related cancers and rates of noninfectious-related cancers initially increasing, before eventually declining.

Meaning

These findings support the theory that cancer transitions are occurring in the US, select European nations, and Japan.

Abstract

This cross-sectional study examines the incidence of infectious- and noninfectious-related cancers in the US, select European countries, and Japan from 1950 to 2018.

Abstract

Importance

Despite cancer being a leading cause of death worldwide, scant research has been carried out on the validity of the cancer transition theory, the idea that as nations develop, they move from a situation where infectious-related cancers are prominent to one where noninfectious-related cancers dominate.

Objective

To examine whether cancer transitions exist in the US, select European countries, and Japan.

Design, Setting, and Participants

In this cross-sectional study, annual cause-of-death data from the 1950s to 2018 for the US, England and Wales, France, Sweden, Norway, and Japan were extracted from the Human Mortality Database and the World Health Organization (WHO). Statistical analysis was performed from April 2020 to February 2021.

Main Outcomes and Measures

Age-standardized death rates for all ages and both sexes combined were estimated for cancers of the stomach, cervix, liver, lung, pancreas, esophagus, colorectum, breast, and prostate.

Results

The results of the analysis show that for all countries in this study except for Japan, mortality from infectious-related cancers has declined steadily throughout the period, so that by the end of the period, for Norway, England and Wales, Sweden, and the US, rates were approximately 20 deaths per 100 000 population. Regarding noninfectious-related cancers, at the beginning of the period, all countries exhibited an increasing trend in rates, with England and Wales having the greatest peak of 215.1 deaths per 100 000 population (95% CI 213.7-216.6 deaths per 100 000 population) in 1985 followed by a decline, with most of the other countries reaching a peak around 1990 and declining thereafter. Furthermore, there is a visible crossover in the trends for infectious-related and noninfectious-related cancers in Japan and Norway. This crossover occurred in 1988 in Japan, when the rates for both types of cancers stood at 116 per 100 000 population (95% CI, 115.0-116.5 per 100 000 population), and in 1955 in Norway, when they passed each other at 100 per 100 000 population (95% CI, 96.4-105.3 per 100 000 population).

Conclusions and Relevance

In this cross-sectional study, the findings suggest that cancer mortality patterns parallel the epidemiological transition, which states that as nations develop, they move from a stage where infectious diseases are prominent to one where noninfectious diseases dominate. An implication is that the epidemiological transition theory as originally formulated continues to be relevant, despite some researchers arguing that there should be additional stages beyond the original 3.