Rat study: highest PEG level in liver (7% of dose); no TNF-associated tissue uptake of PEG
“The highest level of PEG was detected in the liver (7% of the dose administered). There was no indication of tissue uptake of PEG, associated with binding to membrane bound TNF alpha.”
Lymphoma/malignancy risk from long-term TNF-α inhibition
“the possible risk for the development of lymphomas or other malignancies in patients treated with TNF antagonists is reflected in the SPC and PL, and warrants post marketing surveillance.”
10-20% ADA incidence in main monkey studies (assay interference); shortened half-life, no toxicological consequences
“The antibody incidence in the main monkey toxicity studies were 10-20%. It should be noted that the presence of CDP870 in the plasma sample interferes with the antibody analyses, and thus data are uncertain. Presence of antibodies resulted in shortened t1/2. There were no apparent toxicological consequences of antibody formation.”
7% (105/1,509) in RA placebo-controlled trials; 3% (39/1,509) neutralizing
“The overall percentage of patients with antibodies to certolizumab pegol detectable on at least one occasion was 7% (105 of 1,509) in the rheumatoid arthritis placebo-controlled trials. Approximately one third (3%, 39 of 1,509) of these patients had antibodies with neutralizing activity in vitro.”
In vitro whole-blood cytokine release far below alemtuzumab/TGN1412 controls; no effects on monkey TDAR, lymphocyte subsets or serum cytokines; ADA in some monkeys