SAN ANTONIO (EGMN) - The use of radiotherapy following breast-conserving surgery for invasive cancer is declining in the United States - and that's a trend spelling trouble, Beth A. Virnig, Ph.D., asserted at a breast cancer symposium sponsored by the Cancer Therapy and Research Center.Breast-conserving surgery (BCS) without radiotherapy constitutes a failure to provide adequate local tumor control. Some prominent epidemiologists predict this will lead to increased late mortality, although that prediction...