BACKGROUND: Challenges have arisen in finding an effective treatment for pancreatic ductal adenocarcinoma (PDAC). Poor outcomes have fueled ongoing efforts to exploit the tumor microenvironment (TME) in the treatment of PDAC
however, to date, treatment strategies have largely failed. Thus, a comprehensive and deep understanding of the PDAC TME is necessary. The purpose of the present study was to investigate chemotherapy-induced tumor microenvironment changes and to optimize the response to immunotherapy in PDAC. METHODS: We analyzed publicly available single-cell RNA sequencing (scRNA-seq) PDAC (with or without standard chemotherapy) data and performed systematic analyses to elucidate novel mechanisms and to determinate the marker expression alteration induced by the chemotherapy. RESULTS: Lysozyme ( CONCLUSIONS: We described the characteristics of widely expressed markers in different cell types in PDAC. Chemotherapy disrupted the TME balance, altered tumor antigen presentation, and changed