Biobehavioral factors in cancer pain

Despite the presence of pathology in cancer pain, the pain experience in adult cancer patients cannot be totally explained by the extent of such pathology. Unlike chronic benign pain very little research on the role of biobehavioral factors has been conducted to help explain this paradox. The literature on the role of biobehavioral factors in the cancer pain experience is reviewed. A brief review of epidemiology and pathophysiology is presented. Following this, the biobehavioral literature was organized according to research on psychological characteristics and environmental factors. Research addressing affective, cognitive, behavioral and physiological reactions to pain was also discussed. Despite the paucity of studies, the review suggested the following: (1) personality factors do not appear to play a consistent role in the modulation of pain in cancer patients; (2) the work on environmental influences on cancer pain indicate a weak association between such factors as social network and pain intensity; (3) studies on affective state indicate minimal relationships to pain, and lastly, (4) studies on cognitive responses to pain in cancer patients and their influence on the pain experience have not been conducted. To date, in the areas where biobehavioral factors have been investigated, the findings appear modest. However, many potential variables, e.g., self-esteem, the role of family, the role of models, past or current work environments, social learning factors and responses to pain such as fear, somatization and reattribution have not been explored with cancer patients. While the influence of biobehavioral factors in adult cancer pain appear to be relatively modest, the literature is not extensive. Increased efforts at more precisely determining the input of such factors in cancer pain are warranted, particularly given the role of such variables in other recurrent and chronic pain states.