Can Albumin Bilirubin Ratio and Inflammatory Prognostic Index Be A New Marker Determining Survival in Metastatic Pancreatic Cancer?

The main purpose of our study is to analyze the predictive and prognostic value of inflammatory prognostic index (IPI (using albumin, CRP, neutrophils and lymphocytes) and albumin / bilirubin ratio in metastatic pancreatic cancer patients in addition to other markers currently used.Medical records of patients with pancreatic cancer treated in Celal Bayar University Medical Faculty Hospital Medical Oncology Clinic between February 2012 and April 2020 were retrospectively reviewed. Clinicopathologic variables such as age, gender, performance status (PS), treatments, histopathology type, localization of metastasis, comorbidity were recorded by an electronic medical record system. Patients performance status were recorded according to the Eastern Cooperative Oncology Group (ECOG). A total of 110 pancreatic cancer patients were reviewed. The IPI was calculated as C-reactive protein × NLR (neutrophil/lymphocyte ratio)/serum albumin. Univariate and multivariate analyses were performed to assess the prognostic value of relevant factors.Median OS of all patients was 6 months. The NLR cut off value we calculated was 3,47. The median OS of 47 (49,4%) patients was 8 months (95 % cl. 8,673- 15,383) with NLR < 3,47 and median OS of 48 (50,6%) patients was 4 months (95 % cl. 4,221-7,523) with NLR ≥ 3,47 (P: 0,001). The cut off value calculated for the IPI was 0,79. The median OS of 24 (25,8 %) patients was 8 months (95 % cl. 7,475-18,814) with IPI < 0,79 andmedian OS of 69 (74,2 %) patients was 5 months (95 % cl. 5,774-9,580) with IPI ≥ 0,79 (P: 0,047). The ABR cut off value we calculated was 5,23. The median OS of 45 (47,3 %) patients was 4 months (95 % cl. 8,879- 15,174) with ABR ≥ 5,23 and median OS of 50 (42,7 %) patients was 9 months (95 % cl. 4,015-7,585) with ABR < 5,23 (p< 0.001) (Figure 1). According to this analyses, presenting with jaundice, peritoneum metastasis, CA19.9 and LDH values higher than cut off, high NLR, high IPI and high ABR were also significantly associated with OS. In multivariate analyses, ABR was an independent prognostic factor in PC. Patients with high ABR (> 5,23) had increases in the risk of death compared with those with low ABR (< 5,23) (HR, 0,305; 95 % CI, 0,176-0,531; p: 0.000). Alongside ABR, CA-19.9 (HR, 2,300; 95 % CI, 1,111-4,764; p: 0,025) and LDH (HR, 3,348; 95 % CI, 1,792-6,253; p: 0.000) were an independent prognostic factor in PC.In this study, we demonstrated that both IPI and ABR, which were not evaluated in PC before, are non-invasive, cheap, accessible, and easily formulated parameters in determining the prognosis. Especially the fact that ABR is an independent prognostic indicator in multivariate analysis makes it stronger. Although we are aware that our study is retrospective, we hope that the reliability of these scores will increase if it is done with more patient series and if it is done multicenter.