Target-responsive subcellular catabolism analysis for early-stage antibody-drug conjugates screening and assessment

Events including antibody‒antigen affinity, internalization, trafficking and lysosomal proteolysis combinatorially determine the efficiency of antibody-drug conjugate (ADC) catabolism and hence the toxicity. Nevertheless, an approach that conveniently identifies proteins requisite for payload release and the ensuing toxicity for mechanistic studies and quality assessment is lacking. Considering the plethora of ADC candidates under development, we developed a target-responsive subcellular catabolism (TARSC) approach that examines ADC catabolism and probes changes in response to targeted interferences of proteins of interest. We firstly applied TARSC to study the commercial T-DM1 and the biosimilar. We recorded unequivocal catabolic behaviors regardless of the absence and presence of the targeted interferences. Their negligible differences in TARSC profiles agreed with their undifferentiated anti-tumoral efficacy according to further

Requirements of FDA for biosimilarity studies of clinical pharmacology of biosimilars / 药物评价研究

FDA released Clinical Pharmacology Data to Support a Demonstration of Biosimilarity to a Reference Product Guidance for Industry in December,2016.The guidance describes the requirements of the trial designs and trial methods for the biosimilar clinical pharmacological studies,and especially points out the problems that should be paid special attention to in the studies.However there is no similar guidance in China.This paper introduces the guidance of FDA,which is beneficial to the research and regulation in China.

Biosimilarity Study Regarding Product Quality of Candidate Recombinant Monoclonal Antibodies as Biosimilars / 中国药学杂志

OBJECTIVE: Nowadays, recombinant monoclonal antibodies developed as biosimilar domains in application category for Investigational New Drug in domestic. The quality similarity should be prequalified for candidate drug to be developed as biosimilar. Here, the concept of quality biosimilarity was proposed and discussed from reviewer as well as developer. METHODS: The challenge of developing and evaluating biosimilar antibodies was emphasized. Then, the domestic sponsor's common problems were sorted out and critical quality attributes of some originator antibodies were summarized. Lastly, the reasons of holding letter or case rejected were exemplified and analyzed. RESULTS: AND CONCLUSION: The sponsor are encouraged to conduct comparing exercise by state-of-art analytical technologies to conform the quality similarity between a proposed biosimilar antibody and the originator product, the reviewers should also be very cautious to assess quality differences. Joint efforts and effective communication from researcher and reviewer are critical for promoting development of domestic biosimilar and addressing the unmet medicine need.