940 High plasma cell presence in oral cancers with high frequencies of tumor-infiltrating B cells identified by transcriptional, flow cytometric and spatial profiling by Rieneke van de Ven, Tara Muijlwijk, Dennis NLM Nijenhuis, Sonja H Ganzevles, Stina Lie Hansson, Anabel van der Lee, Irene Nauta, C Rene Leemans, Ruud H Brakenhoff