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Psychometric testing of the Functional Assessment of Cancer Therapy/Gynecologic Oncology Group—Neurotoxicity (FACT/GOG-Ntx) subscale in a longitudinal study of cancer patients treated with chemotherapy
journal contributionposted on 2022-02-23, 04:31 authored by Hui L Cheng, Violeta LopezVioleta Lopez, Simon C Lam, Anthony KT Leung, Yu C Li, Kam H Wong, Joseph SK Au, Raghav Sundar, Alexandre Chan, Terrence R De Ng, Lorna KP Suen, Choi W Chan, Janelle Yorke, Alex Molassiotis
Background: The aim of this study was to evaluate the psychometric properties of the Functional Assessment of Cancer Therapy/Gynecologic Oncology Group—Neurotoxicity (FACT/GOG-Ntx) subscale in a longitudinal study of cancer patients treated with chemotherapy. Methods: Patients were assessed with the FACT/GOG-Ntx subscale, European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Chemotherapy-Induced Peripheral Neuropathy Scale 20 (EORTC QLQ-CIPN20), National Cancer Institute -Common Terminology Criteria for Adverse Events (NCI-CTCAE), and light touch test using 10 g monofilament for up to ten assessment points from baseline (prior to initiation of first chemotherapy), after the end of each cycle (up to 6 cycles, 3 weeks per cycle), and at 6, 9, and 12 months after starting chemotherapy. Psychometric analyses included internal consistency reliability, convergent validity, factorial validity, sensitivity to change and responsiveness (minimal clinically important difference, MCID). Results: Cronbach’s alpha coefficients of the FACT/GOG-Ntx subscale were 0.82–0.89 across assessment points. The subscale strongly correlated with the EORTC QLQ-CIPN20 (r = 0.79–0.93) but low-to-moderately correlated with the NCI-CTCAE sensory (rs = 0.23–0.45) and motor items (rs = 0.15–0.50) as well as the monofilament test (rs = 0.23–0.47). The hypothesized 4-factor structure of the FACT/GOG-Ntx subscale was not confirmed at assessment points (χ2/ df = 2.26–8.50; all P < 0.001). The subscale exhibited small-to-moderate sensitivity to change (r = 0.17–0.37). The MCIDs were between 1.38 and 3.68
Number of Pages9
Additional RightsCC BY 4.0
External Author AffiliationsUniversity of Manchester, UK; National University of Singapore, National University Health System, Singapore; Hong Kong Adventist Hospital; The Hong Kong Polytechnic University; Queen Elizabeth Hospital, Hong Kong