Downstream process development for therapeutic enzymes can be both complex and resource consuming.These proteins are not amenable to the typical platform process ideas as used in therapeutic antibody development.There is no one characteristic that uniquely defines therapeutic enzymes, resulting in chromatog. steps with low binding capacities and less than ideal resolution of product from host cell proteins.However, the ideas of a platform strategy are beneficial to therapeutic enzyme downstream process development.At Shire, the platform strategy for downstream process development consists of predetermined targets for product and process performance, batch mode screening to identify resins and initial process conditions, column mode screening to identify binding, wash and elution conditions, and set tech. reviews for data evaluation and gaining consensus on resin choice, order of process steps and process conditions.Application of the platform strategy to a specific therapeutic enzyme will be discussed.