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MINI 15 - Chemotherapy Developments for Lung Cancer (ID 128)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Advanced Diseases - NSCLC
- Presentations: 1
MINI15.07 - Prognostic Importance of Pretreatment Sodium Levels in Patients of NSCLC Treated with Pemetrexed-Platinum Doublet Chemotherapy (ID 2926)
16:45 - 18:15 | Author(s): V. Gota
A recent study has shown pretreatment sodium levels to be a predictive and prognostic marker in NSCLC patients treated with erlotinib. The objective of this study was to evaluate the prognostic impact of pretreatment sodium levels on progression free survival (PFS) and overall survival (OS) in patients of NSCLC treated with pemetrexed-platinum doublet chemotherapy.
Stage IIIB/ IV NSCLC patients aged ≥ 18 years treated between January 2011 to November 2014 at our centre were included in this retrospective study. Patients received pemetrexed 500 mg/m with either cisplatin 75 mg/m[2 ]or carboplatin (AUC 5) on day 1 of a 21 day cycle for 6 cycles followed by maintenance pemetrexed till progression. Electronic medical record (EMR) database of our hospital was used to retrieve demographic data, pretreatment sodium levels, PFS and OS data. LSS was defined as serum sodium < 136mEq/L. Survival analysis was performed using Kaplan-Meier curves and compared between LSS and normal serum sodium (NSS) groups using Log-Rank test and proportional hazard model.
Figure 1Data was available for 256 patients (M/F = 172/84) with median age of 53 (25-79) years. Majority had ECOG PS of 1 (0 = 34, 1 = 172, 2 = 44, 3 = 6). Stage IIIB = 24 (9%), stage IV = 232 (91%). Pretreatment LSS was observed in 75 (29%) patients while 181 (71%) had NSS. Median duration of follow-up was 17 months. Patients with NSS had significantly longer PFS (10.7 vs. 7.4 months; P < 0.05) and OS (17.6 vs. 13.4 months; P < 0.05) compared to LSS group. Cox-proportional hazard model has shown LSS was an independent prognostic biomarker for poor survival (P < 0.05).
Pretreatment serum sodium level is an important prognostic marker in stage IIIB/ IV NSCLC patients. The simple possibility of testing coupled with low cost makes it an attractive marker to implement in clinical practice.
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