The Illinois Health Facilities Planning Board has ruled that Plainfield does not need its own hospital and deferred a decision on whether DuPage County should get a second proton therapy cancer-treatment center. This is the third time in five years that the board has rejected plans by Naperville-based Edward Hospital to build a $234 million, 162-bed hospital. Edward officials say the hospital is needed because of the area's rapid growth and because one-third of the patients at its crowded Naperville campus come from the Plainfield area.