BackgroundHope has a positive impact on health, playing a significant role in managing illness and its associated losses. In oncology patients, hope is crucial for effective adaptation to the disease, as well as a strategy for coping with physical and mental distress. It enhances disease management, psychological adaptation, and overall quality of life. However, due to the complexity of the effect of hope on patients, particularly those under palliative care, identifying its relationship with anxiety and depression remains a challenge.MethodologyIn this study, 130 cancer patients completed the Greek version of the Herth Hope Index (HHI-G) and the Hospital Anxiety and Depression Scale (HADS-GR).ResultsThe HHI-G hope total score was strongly negatively correlated with HADS-anxiety (r = -0.491, p < 0.001) and HADS-depression (r = -0.626, p < 0.001). Patients with performance status, as defined by the Eastern Cooperative Oncology Group (ECOG), of 0-1 without radiotherapy had higher HHI-G hope total scores compared to those with ECOG status 2-3 (p = 0.002) and radiotherapy (p = 0.009). Multivariate regression analysis showed that patients who received radiotherapy had 2.49 points higher HHI-G hope scores compared to those who did not (explaining 3.6% of hope). An increase of 1 point in depression led to a 0.65-point decrease in the HHI-G hope score (explaining 40% of hope).ConclusionsA deeper understanding of common psychological concerns and hope in patients with serious illnesses can improve their clinical care. Mental health care should focus on managing depression and anxiety, as well as other psychological symptoms, to enhance and maintain patients’ hope.