To determine the Maximum Tolerated Dose (MTD), the tolerability, and the initial safety profile of CMC-544 in subjects with B-cell Non-Hodgkin's Lymphoma (NHL).
Inclusion Criteria: * Subjects who have been previously diagnosed with CD22-positive, B-cell NHL, according to WHO classification, which has progressed after at least 2 prior therapies of probable clinical benefit * At the expanded cohort, part 2 of the study, subjects must have one of the following: * Follicular lymphoma previously treated with at least one dose of rituximab, but have not received radioimmunotherapy * Diffuse large B-cell lymphoma * Age 18 years or older Exclusion Criteria: * Candidate for potentially curative therapies in the opinion of the investigator * Chronic lymphocytic leukemia * Burkitt's lymphoma, primary effusion lymphoma, and precursor B-cell lymphoblastic lymphoma
is designated in this study