Stability of symptom clusters in patients with gastrointestinal cancers receiving chemotherapy.

Abstract

193 Background: Patients with gastrointestinal (GI) cancers who undergo chemotherapy (CTX) experience on average of thirteen symptoms. These co-occurring symptoms often cluster together and can influence various patient outcomes including quality of life (QOL). However, little evidence is available on how these symptoms change during a cycle of chemotherapy (CTX). An evaluation of how these symptom cluster together and how these symptom clusters change over time may provide useful information to guide symptom management strategies tailored to multiple symptoms. Objectives: The purpose of this study was to identify and compare symptom clusters using three symptom dimensions (i.e., occurrence, severity, and distress) at different time points during CTX (i.e., prior to CTX [T1], one week after CTX administration [T2], and two weeks after CTX administration [T3]) in patients with GI cancers. Methods: A modified version of the Memorial Symptom Assessment Scale was used to assess the occurrence, severity, and distress of 38 symptoms. Exploratory factor analyses were used to create the symptom clusters. Results: Five distinct symptom clusters were identified across the three symptom dimensions and the three assessments (i.e., psychological, CTX-related, weight change, GI, and epithelial). Psychological, CTX-related and weight change clusters were relatively stable for all three symptom dimensions as well as across time. GI cluster was identified only at T1, while epithelial cluster was identified at T2 and T3 for all three symptom dimensions. Conclusions: The number and types of symptom clusters appear to be relatively stable over time and across the symptom dimensions. Timely management of symptom clusters should be continued over the course of CTX including the recovery phases. Further studies are needed to explore the mechanisms of symptom clusters in patients with GI cancers undergoing CTX.