RESUMEN
BACKGROUND/AIM: FOLFIRINOX (FFX) is a standard treatment for patients with advanced pancreatic cancer. However, it often causes serious hematological adverse events. This study aimed to identify the risk factors for febrile neutropenia (FN) and grade 4 (G4) neutropenia during treatment with FFX in the real world. PATIENTS AND METHODS: We analyzed data obtained from a nationwide multicenter observational study (JASPAC 06) that included 399 patients with unresectable or recurrent pancreatic cancer who received FFX at 27 institutions in Japan. RESULTS: Nadir neutrophil counts occurred from day 8 to day 22 of cycle 1, and granulocyte colony-stimulating factor was administered to over a quarter of the patients in the first cycle. Of 399 patients, FN and G4 neutropenia occurred in 51 (13%) and 108 (27%) patients, respectively. Most FN (83%) and G4 neutropenia (75%) occurred in the first or second cycles. Multivariate logistic regression analyses showed that total bilirubin (TB) > the upper limit of normal range (ULN) and no dose modification from the original regimen were significantly associated with FN, and that TB > ULN, no dose modification from the original regimen, low platelet count (<15×104/µl), and recurrent disease after pancreatectomy were independent risk factors for G4 neutropenia. CONCLUSION: No dose modification from the original regimen and TB > ULN were risk factors for FN and G4 neutropenia.