If such cancers were all caught by early screening, the group estimates that the survival rate for cancer would rise to 95 percent.

　　Dangers Await Babies with Altitude

　　Women who live in the worlds highest communities tend to give birth to underweight babies，a new study suggests.These babies may grow into adults with a high risk of heart disease and strokes.

　　Research has hinted that newborns in mountain communities are lighter than average.But it wasnt clear whether this is due to reduced oxygen levels at high altitude or because their mothers are under-nourished-many people who live at high altitudes are relatively poor compared with those living lower down.

　　To find out more，Dino Giussani and his team at Cambridge University studied the records of400 births in Bolivia during 1997 and 1998.The babies were born in both rich and poor areas of two cities：La Paz and Santa Cruz.La Paz is the highest city in the world，at 3.65 kilometers above sea level，while Santa Cruz is much lower，at 0.44 kilometers.

　　Sure enough，Giussani found that the average birthweight of babies in La Paz was Significantly lower than in Santa Cruz.This was true in both high and lowincome families.Even babies born to poor families in Santa Cruz were heavier on average than babies born to wealthy families in lofty La Paz.We were very surprised by this result, says Giussani.

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