- Histologically confirmed B-cell NHL (FL or DLBCL), transformed indolent lymphoma, and MCL: Measurable disease defined as ≥ 1 lesion ≥ 20 mm in one dimension or ≥15 mm in 2 dimensions as measured by conventional or high-resolution (spiral) computed tomography (CT). For Arms C and D: disease evaluable by the International Working Group criteria (Cheson et al, 2007)