Cognitive adaptation theory and quality of life in late-stage cancer patients.

In this study, the question of whether using slightly illusionary, positive attributions of self, control, and meaning (e.g., cognitive adaptation theory), in the face of disconfirmatory evidence, facilitates quality of life in late-stage cancer patients was examined. Eighty late-stage cancer patients (Mean age = 59.7, SD = 12.5; 48.8% male, 51.2% female; varying cancer diagnoses) who recently failed or refused first line anti-neoplastic treatment completed questionnaires assessing meaning, control, self-esteem, and optimism, as well as physical and psychological quality of life. Findings suggest that greater self-esteem, control, and meaning predicted physical and psychological quality of life, with physical quality of life being influenced by control beliefs and psychological quality of life influenced by self-esteem. Optimism independently predicted physical quality of life and neither mediated nor moderated the relationship between cognitive adaptation and quality of life. Findings suggest that slightly positive, illusionary beliefs of self, control, and meaning predicted quality of life even in the presence of clear, disconfirmatory environmental evidence.