Phase I evaluation of intravenous ascorbic acid in combination with gemcitabine and erlotinib in patients with metastatic pancreatic cancer. oleh Daniel A Monti, Edith Mitchell, Anthony J Bazzan, Susan Littman, George Zabrecky, Charles J Yeo, Madhaven V Pillai, Andrew B Newberg, Sandeep Deshmukh, Mark Levine