This article was originally published here
Oncologist. 2020 Sep 20. doi: 10.1002/onco.13527. Online ahead of print.
ABSTRACT
BACKGROUND: Prior comparisons of chemotherapy adverse events (AEs) by age and performance status (PS) are limited by the traditional maximum grade approach, which ignores low-grade AEs and longitudinal changes.
PATIENTS AND METHODS: To compare fatigue and neuropathy longitudinally by age (<65, >65) and PS (0-1, 2), we analyzed data from a large phase III trial of carboplatin/paclitaxel versus paclitaxel for advanced non-small cell lung cancer (CALGB 9730, N=529). We performed multivariable a) linear mixed models to estimate mean AE grade over time, b) linear regression to estimate area under the curve (AUC), and c) proportional hazards models to estimate the hazard ratio of developing grade >2 AE, as well as traditional maximum grade analyses.
RESULTS: Older patients had on average a 0.17 point (95% CI 0.00, 0.34; p=0.049) higher mean fatigue grade longitudinally compared with younger patients. PS 2 was associated with earlier development of grade >2 fatigue (HR 1.56; 95% CI 1.07, 2.27; p=0.02). For neuropathy, older age was associated with earlier development of grade >2 neuropathy (HR 1.41; 95% CI 1.00, 1.97; p=0.049). PS 2 patients had a 1.30 point lower neuropathy AUC (95% CI -2.36, -0.25; p=0.02) compared with PS 0-1. In contrast, maximum grade analyses only detected a higher percentage of older adults with grade >3 fatigue and neuropathy at some point during treatment.
CONCLUSION: Our comparison of complementary but distinct aspects of chemotherapy toxicity identified important longitudinal differences in fatigue and neuropathy by age and PS that are missed by the traditional maximum grade approach.
IMPLICATIONS FOR PRACTICE: The traditional maximum grade approach ignores persistent low grade AEs and changes over time. This Toxicity Over Time analysis of fatigue and neuropathy during chemotherapy for advanced NSCLC demonstrates how to utilize longitudinal methods to comprehensively characterize AEs over time by age and PS. We identified important longitudinal differences in fatigue and neuropathy that are missed by the maximum grade approach. This new information about how older adults and PS 2 patients experience these toxicities longitudinally may be used clinically to improve discussions about treatment options and what to expect to inform shared decision making and symptom management.
PMID:32951293 | DOI:10.1002/onco.13527
