Abstract
Background: Recent studies have shown pretreatment sodium level to be a predictive and prognostic marker in nonsmall cell lung cancer (NSCLC) patients treated with erlotinib. The objective of this study was to evaluate the prognostic significance of pretreatment sodium levels on progression-free survival (PFS) and overall survival (OS) in patients of NSCLC treated with pemetrexed-platinum doublet chemotherapy. Patients and Methods: Stage IIIb/IV NSCLC patients aged ≥18 years for whom baseline serum sodium level was available were included in this retrospective study. All patients received standard pemetrexed-cisplatin/carboplatin doublet for six cycles followed by maintenance pemetrexed till progression. Electronic medical record database of our hospital was used to retrieve demographic data, pretreatment sodium levels, and survival data. Normal serum sodium (NSS) was defined as serum sodium ≥136 mEq/L, and low serum sodium (LSS) was defined as serum sodium
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1 Department of Clinical Pharmacology, Advanced Centre for Treatment, Research and Education in Cancer, Tata Memorial Centre, Mumbai, Maharashtra
2 Department of Biostatistics, Advanced Centre for Treatment, Research and Education in Cancer, Tata Memorial Centre, Mumbai, Maharashtra
3 Department of Medical Oncology, Tata Memorial Hospital, Mumbai, Maharashtra