Secretory Proteins, Volume 133 in the Advances in Protein Chemistry and Structural Biology series highlights new advances in the field, including chapters on Proprotein Convertases regulate trafficking and maturation of key proteins within the secretory pathway, Secretory Proteins in Cancer Diagnosis, Senescent Cells and SASP in Cancer Microenvironment: new approaches in cancer therapy, Autophagy for secretory protein: Therapeutic targets in cancer, Secretory proteins and pathways of secretion of osteosarcoma, Monocyte secretory proteins as drug targets for arresting progression of atherosclerosis, The secretory phenotypes of envenomed cells: insights into venom cytotoxicity, Macromolecules for secretory pathway in SARS-CoV-2 infection, and much more. Other sections cover Exploring the role of secretory proteins in the human infectious diseases diagnosis and therapeutics, Secretory proteins in orchestration of microbial pathogenesis- the curious case of Staphylococcus aureus, Influence of pathological mutations in Aspartylglucosylamine Deaspartylase causing Aspartylglucosaminuria: an in silico approach, and Change in conformational dynamics of Lipase A secretory protein upon mutation causing Wolman disease.