Role of health locus of control beliefs and expectations of treatment efficacy in adjustment to cancer.

Examined the effects of health locus of control beliefs (self-, doctor, and chance control) and expectations of treatment efficacy on short-term psychological adjustment in 137 18–86 yr old newly diagnosed cancer patients. The role of these beliefs and expectations in moderating the relation between perceived and actual disease severity and depression was also examined. Ss completed an intake questionnaire assessing the perceived severity of illness, the amount of pain or discomfort they were experiencing, how sad or depressed they were, and expectations about complying with medication instructions; Ss also completed items from Rotter's Internal–External Locus of Control Scale, the Multi-Dimensional Health Locus of Control Scale, and the Self-Rating Depression Scale. The relation between perceptions of disease severity and depression was weaker for Ss who believed that they could personally control their health and for those who held positive expectations about the effects of complying with medical treatment. Similar patterns were found when disease severity was defined in terms of prognosis for survival. Strong negative correlations between self-control/treatment expectations and depression were found for Ss who perceived that their illness was severe. The results for chance and doctor control were less consistent. The stability of health control beliefs and treatment expectations over the course of a serious long-term illness is discussed. (34 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)