New research from South Korea provides more evidence of a link between height and cancer risk.
Several studies, mostly involving Western populations, have found that cancer risk increases with height, Dr Joohon Sung of Seoul National University and colleagues note in the American Journal of Epidemiology.
Possible mechanisms for the association, the researchers say, include early environmental exposures that influence both growth and cancer, like diet; genes that affect both skeletal growth and risk of cancer; and the fact that taller people just have more body tissue and thus offer a bigger target for cancer growth.
How the study was done
To investigate whether the findings might hold true in an Asian population, Sung and colleagues looked at 788 789 Koreans 40 to 64 years old who were followed from 1994 to 2003.
For men, they found, every additional five centimetres in height was associated with a 5% greater risk of developing any type of cancer after they had adjusted for socioeconomic status, age, and other relevant factors.
For women, risk increased by 7% for every extra five centimetres in height.
When the researchers looked at site-specific cancers, they found an association between height and colon cancer and thyroid cancer for men and women. Prostate, breast, and ovarian cancer risk also climbed with height.
"The consistencies in the associations between height and cancer in our studies and in previous studies in different populations support the likelihood of a common pathway that affects skeletal growth and cancer risk across these populations," the researchers conclude. – (Reuters Health, July 2009)
Height affects prostate cancer risk