How do you design an integrated continuous manufacturing process for monoclonal antibodies?

Integrated continuous mAb manufacturing connects unit operations without intermediate hold steps. Upstream: perfusion bioreactor (ATF/TFF cell retention) at steady-state high cell density, continuous harvest clarification (depth filtration with surge tank). Downstream: continuous capture chromatography (multi-column, PCC, or simulated moving bed), continuous viral inactivation (plug flow reactor with controlled residence time), continuous polishing (IEX/HIC with column switching), virus filtration with appropriate surge capacity, and continuous formulation via inline buffer adjustment and concentration. Integration challenges include: matching throughputs across operations, managing disturbances, surge tank sizing, and process control strategy. Regulatory considerations include continuous process verification, deviation handling, and lot definition. Process analytical technology enables real-time release testing.