In 2002, researchers in a Singapore Chinese study concluded that dietary soy increased risk of bladder cancer. People who consumed 92.5 grams of soy per 1000 Kcal were found to be 2.3 times more likely to be at risk for bladder cancer. The results were calculated to factor in levels of education and cigarette consumption in study participants. (Sun CL and others. Dec. 2002).
A study in 2010 suggested that consuming soy can cause infant leukemia. It was shown that high levels of maternal soy consumption is linked to the development of infant leukemia.