Two million women were diagnosed with breast or cervical cancer last year, according to global figures.
A sharp rise in cases was seen in women under 50 in low-income nations, say US experts.
Women in richer countries fared better due in part to screening, medicines, anti-smoking policies and vaccines, they report in the Lancet.
The research backs calls for world leaders to make cancer prevention a priority in the developing world.
The new global statistics from hundreds of cancer registries worldwide
found there were about 2 million new cases of breast and cervical cancer
in 2010, and 625,000 deaths... Read More