Abstract
133 Background: The MPS, a composite of the Neutrophil-Lymphocyte Ratio (NLR) and albumin, is an alternative prognostic tool to the Glasgow Prognostic Score (C-reactive protein and albumin). A retrospective analysis (jco.2016.34.26_suppl.36) of patients with PDAC suggested that the MPS predicts survival. This did not control for clinically relevant factors such as performance status (PS), metastatic sites, or cancer therapies. More discriminating prognostic tools are needed. Methods: A retrospective chart review identified patients at MSK with pathology-confirmed stage IV PDAC diagnosed from 2011 to 2014. An MPS scale of 0-2 was utilized: MPS = 0 for albumin ≥ 4 g/dl and NLR ≤ 4 g/dl, MPS = 1 for either albumin < 4 g/dl or NLR > 4 g/dl, and MPS = 2 for albumin < 4 g/dl and NLR > 4 g/dl. PS (ECOG or KPS) was abstracted from outpatient visit notes. Metastatic sites at initial MSK visit were assessed from cross-sectional imaging. Cancer therapies were characterized as 5FU-based, gemcitabine-based, experimental, and radiation to primary or metastatic sites. Thromboembolic (TE) diagnoses were also noted. Time-dependent Cox regression analyses identified clinical variables associated with overall survival (OS). Univariately significant variables were utilized in a multivariable regression model to interrogate their effect on the association of MPS and OS. Results: Univariate analyses in n = 833 stage IV PDAC patients identified higher MPS score, higher CA19-9 at diagnosis (n = 737), chemo, radiation, liver metastases, TE, hospital admission, and lower PS (n = 727) as associated with worse OS (p < 0.05). A multivariate model (n = 727) controlling for radiation, liver metastases, TE, admission, and PS demonstrated that higher MPS scores at diagnosis remained associated with worse OS (p < 0.001). Median OS in patients with MPS 0, 1, and 2 were 14.5 (95%CI: 12.9-17), 10.2 (9-11.6), and 6.2 (5.1-8.1) months, respectively. Conclusions: The MPS is an objective prognostic tool associated with OS in advanced PDAC independent of PS, disease characteristics, and types of cancer therapies. Future directions include prospective evaluation and application of the MPS to other PDAC disease settings and other malignancies.
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