- Any serious active disease or co-morbid medical condition that, according to the investigator's decision, will substantially increase the risk associated with the subject's participation in the study. Prior history of malignancies other than lymphoma with the exception of non-melanoma skin tumors (basal cell or squamous cell carcinoma of the skin) or stage 0 (in situ) cervical carcinoma unless the subject has been disease-free for 5 or more years..