However, around the world the increase in deaths from breast cancer has been slower than the increases in cases. This may be due possibly to early detection and treatment advances in developed countries, the researchers say.
"It is clear from the data that since the late 1980s, women who develop breast cancer have had a better chance of surviving because early screening is working and treatment is working," Lozano said.
In 1980, one out of every 32 women in the United States risked dying from breast cancer. By 2010, one out of every 46 women had that risk, he added.
When one looks at countries where screening and treatment are not as widely available, the trend is in the opposite direction, Lozano said.
"In Zimbabwe, for example, the risk has gone from one in 64 women dying to one in 35. Not only is the threat of breast cancer and cervical cancer shifting more heavily toward developing countries, it also is shifting to women of reproductive age," he said.
It used to be that these cancers were predominately a problem for women over 50, but more and more women in sub-Saharan Africa, the Middle East and South Asia are being hit by these cancers between the ages of 15 and 49, Lozano said. "In Bangladesh, more than 60 percent of women dying from breast cancer are under age 50," he added.
Since 1980, new cases and deaths from cervical cancer have increased mainly in south and east Asia, Latin America, and Africa, but have dropped substantially in high-income countries, particularly where widespread screening is available, Lozano's group found.
"Our concern there is that this is a disease that is almost entirely preventable through safe sex practices and early detection, yet it continues to kill" hundreds of thousands of
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