This prospective, non-randomized, single-center observational study is designed to investigate the effects of oral versus intravenous (IV) 5-fluorouracil (5-FU)-based adjuvant chemotherapy regimens on sleep quality and depression levels in patients with non-metastatic gastrointestinal system (GIS) cancers. Eligible adult patients (aged 18 years or older) who are scheduled to receive adjuvant chemotherapy at the Ankara Etlik City Hospital Medical Oncology Department will be assessed using the Pittsburgh Sleep Quality Index (PSQI) and the Beck Depression Inventory (BDI). These evaluations will be conducted at baseline (prior to chemotherapy), on day forty-five, and on day ninety of treatment. This study will not interfere with standard oncologic care. Instead, sleep disturbances and depressive symptoms will be monitored during routine clinical follow-up. Patients identified with significant psychological distress will be referred to psychiatry or sleep medicine departments for further evaluation. The results of this study may provide insights into how different routes of 5-FU administration impact patients' mental health and quality of life, potentially informing future supportive care strategies during adjuvant chemotherapy.
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Change in Sleep Quality Score (Pittsburgh Sleep Quality Index - PSQI)
Timeframe: Baseline, Day 45, Day 90