text: Mary Dempsey, Assistant Director & Co-Founder of the The Patrick Dempsey Center for Cancer Hope & Healing in Lewiston, will testify at the invitation of Senator Collins at a Senate hearing today titled ?ÛÏThe Fight Against Cancer: Challenges, Progress and Promise.?Û? The hearing will focus on the importance of cancer research and highlight the progress that has led to significant improvements in the prevention, detection and treatment of cancer.  Mary visited with Senator Collins in her office this morning prior to the hearing.