Cancer Research and Treatment

Original Article

Gastrointestinal Cancer

Development and Validation of a Symptom-Focused Quality of Life Questionnaire (KOQUSS-40) for Gastric Cancer Patients after Gastrectomy: Bang Wool Eom, Joongyub Lee, In Seob Lee, Young-Gil Son, Keun Won Ryu, Sung Geun Kim, Hyoung-Il Kim, Young-Woo Kim, Seong-Ho Kong, Oh Kyoung Kwon, Ji-Ho Park, Ji Yeong An, Chang Hyun Kim, Byoung-Jo Suh, Hong Man Yoon, Myoung Won Son, Ji Yeon Park, Jong-Min Park, Sang-Ho Jeong, Moon-Won Yoo, Geum Jong Song, Han-Kwang Yang, Yun-Suhk Suh, Ki Bum Park, Sang-Hoon Ahn, Dong Woo Shin, Ye Seob Jee, Hye-Seong Ahn, Sol Lee, Jae Seok Min, Haejin In, Ahyoung Kim, Hoon Hur, Hyuk-Joon Lee, on behalf of KOrean QUality of life in Stomach cancer patients Study group (KOQUSS); Cancer Res Treat. 2021;53(3):763-772. Published online December 29, 2020; DOI: https://doi.org/10.4143/crt.2020.1270

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Purpose
Patients who have undergone gastrectomy have unique symptoms that are not appropriately assessed using currently available tools. This study developed and validated a symptom-focused quality of life (QoL) questionnaire for patients who have received gastrectomy for gastric cancer. Materials and Methods Based on a literature review, patient interviews, and expert consultation by the KOrean QUality of life in Stomach cancer patients Study group (KOQUSS), the initial item pool was developed. Two large-scale developmental studies were then sequentially conducted for exploratory factor analyses for content validity and item reduction. The final item pool was validated in a separate cohort of patients and assessed for internal consistency, test-retest reliability, construct validity, and clinical validity.
Results
The initial questionnaire consisted of 46-items in 12 domains. Data from 465 patients at 11 institutions, followed by 499 patients at 13 institutions, were used to conduct item reduction and exploratory factor analyses. The final questionnaire (KOQUSS-40) comprised 40 items within 11 domains. Validation of KOQUSS-40 was conducted on 413 patients from 12 hospitals. KOQUSS-40 was found to have good model fit. The mean summary score of the KOQUSS-40 was correlated with the EORTC QLQ-C30 and STO22 (correlation coefficients, 0.821 and 0.778, respectively). The KOQUSS-40 score was also correlated with clinical factors, and had acceptable internal consistency (> 0.7). Test-retest reliability was greater than 0.8. Conclusion The KOQUSS-40 can be used to assess QoL of gastric cancer patients after gastrectomy and allows for a robust comparison of surgical techniques in clinical trials.

Citations

Citations to this article as recorded by

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