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S.M. Shors



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    MINI 04 - Clinical Care of Lung Cancer (ID 102)

    • Event: WCLC 2015
    • Type: Mini Oral
    • Track: Treatment of Advanced Diseases - NSCLC
    • Presentations: 1
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      MINI04.07 - Changes in Skeletal Muscle Index and Body Mass Are Prognostic Factors in First Line Stage IV Non-Small Cell Lung Cancer (NCSCL) Patients (ID 3091)

      17:20 - 17:25  |  Author(s): S.M. Shors

      • Abstract
      • Presentation
      • Slides

      Background:
      Cancer cachexia is a complex metabolic syndrome affecting 60-80% of patients with non-small cell lung cancer (NSCLC). The characteristic involuntary weight loss observed in cachexia is associated with poor outcomes in advanced NSCLC; however, reduced muscle mass may be a more reliable prognostic indicator. In this study, we examine the impact of changes in weight and skeletal muscle index (SMI) in the first 12-weeks of therapy on clinical outcome parameters for front line stage IV NSCLC patients.

      Methods:
      Cancer cachexia is a complex metabolic syndrome affecting 60-80% of patients with non-small cell lung cancer (NSCLC). The characteristic involuntary weight loss observed in cachexia is associated with poor outcomes in advanced NSCLC; however, reduced muscle mass may be a more reliable prognostic indicator. In this study, we examine the impact of changes in weight and skeletal muscle index (SMI) in the first 12-weeks of therapy on clinical outcome parameters for front line stage IV NSCLC patients.

      Results:
      119 patients had serial weights available and were included for analysis: 49% were male, median age of males was 71, and females were 63 years; 82% had smoking history. Histology was predominantly adenocarcinoma and squamous (62% and 22%). Median PFS was 159 days, and medial OS was 314 days. Median weights for males at baseline, 6 weeks, and 12 weeks were 77.3, 76.9, and 77.3 kilograms respectively. Median weights for females at baseline, 6 weeks, and 12 weeks were 67.1, 66.7, 65.8 kilograms respectively. Baseline weights were less for women than men (p<0.0007) but the change in weight with time was not significantly different at measured time points. Weight loss of greater than 10.39 pounds in the first six weeks of treatment was strongly associated with inferior outcomes (PFS 2.35 vs. 6.44 months, p=2.02 x 10[-7]; OS 3.96 vs. 15.48 months, p=8.71 x 10[-9]). Persistent weight loss at 12 weeks was also associated with worse outcomes (PFS p=1.72x10[-7 ], OS p= 0.00286). Within this cohort, 41 patients had baseline SMI measured from their CT scans, 27 patients had additional CT-derived SMI available at 6- and 12- weeks. Patients with SMI decrease at 12 weeks of at least 2.6 units (n=9, 33%) had an inferior median PFS compared with those not meeting this threshold (2.79 months vs. 9.75 months p<0.05). In a multivariate analysis, this loss, when adjusted by gender, remained significantly associated with PFS (HR=2.37, p < 0.05).

      Conclusion:
      This study shows the prognostic value of weight loss for progression on first line chemotherapy as early as six weeks following therapy initiation. This analysis confirms the significant association between weight loss on serial measurements and inferior survival in stage IV NSCLC pts. Additionally, this is the first report of decreasing CT-derived SMI correlating with inferior progression free survival on front line platinum doublet therapy for NSCLC.

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