- To assess dose-limiting toxicity and maximum-tolerated dose (MTD) of Se-methyl-seleno-L-cysteine (MSC) (to achieve a trough serum selenium [Se] concentration of > 20 μmol/L) prior to and in combination with rituximab, ifosfamide, carboplatin, and etoposide (R-ICE) in patients with relapsed or refractory diffuse large B-cell lymphoma. (Phase I)