Childhood Cancer Patients Find Survival Has Price
More and more children are surviving cancer, but survival comes at a heavy price; many survivors have health problems caused by their radiation and chemotherapy, including heart, lung and kidney dysfunction, memory loss, infertility and even second cancers; added to this are social difficulties, from awkwardness in dating to difficulty finding jobs and health insurance; Camila Cruz of Baytown, Tex, describes her triumph over osteosarcoma as a teen-ager and its lingering aftermath; photos (M)