One of the reasons that cancer has become an epidemic is because we are eating too much protein. Protein is a food for growth. If we take milk or meat or soy in large quantities when we are no longer growing, this will translate into obesity and other growths like cancers and tumours. Our problem today is not soy, but the protein addiction and a high protein diet.
We must keep in mind that there are plenty of people with cancers out there and a very small fraction of them have been heavy soy consumers. Soy should not be feared as a leading cause of cancer.