499 AT1636, a colon cancer survivor-derived antibody recognizes a previously unidentified truncated, O-mannosylated 70kDa variant of E-cadherin by Evelien Dekker, Tim Beaumont, Sabrina Merat, Mark Kwakkenbos, Lina Bartels, Dorien van der Berg, Koen Wagner, Arjen Bakker, Kelly Maijoor, Martino Bohne, Camille Bru, Veronika Kattler, Yvonne Claassen, Victorine Roos, Frank Kallenberg, Jan Medema, Paul Hensbergen