| Summary: | Systemic chemotherapy plays an important role in the treatment of pancreatic cancer, to improve the survival of patients with pancreatic cancer. Unresectable pancreatic cancer can be classified into three categories: metastatic, locally advanced, and hereditary pancreatic cancers. Furthermore, the second-line chemotherapy is required to prolong the survival. The combined regimens of oxaliplatin, irinotecan, fluorouracil and leucovorin (FOLFIRINOX) and gemcitabine plus nab-paclitaxel (GEM plus nab-PTX) have been recognized as the standard of care for advanced pancreatic cancer. However, the consensus of selection of the first-line chemotherapy still remains. Randomized controlled trials (RCTs) between FOLFIRINOX and GEM plus nab-PTX are ongoing for locally advanced and metastatic disease in Japan, respectively. Hereditary pancreatic cancer, especially associated with <i>BRCA</i> mutations, is responsive to platinum-containing regimens and/or poly (ADP-ribose) polymerase (PARP) inhibitors. It is becoming more important to examine the presence/absence of <i>BRCA</i> mutations to select the appropriate treatment strategy for individual patients. Although some S-1-based regimens have been investigated in the second-line treatment after GEM-based chemotherapy in Japan, no regime demonstrated survival benefit. Nanoliposomal irinotecan (nal-IRI) plus FF has been established as the standard of care in the second-line treatment in a global phase III trial (NAPOLI-1). A randomized phase II trial comparing FF plus nal-IRI with FF alone was also conducted in Japan to examine the efficacy and safety of the FF plus nal-IRI in Japanese patients.
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