There is some evidence for an association between Cluster C Personality Disorders (CCPD) and suicidal behavior. We compared depressed inpatients with and without CCPD in terms of suicidal behavior and associated psychopathology. Cluster A or B personality disorder co-morbidity were exclusion criteria for both groups (cases and controls). Depressed inpatients with "pure" CCPD had higher levels of suicidal ideation but not more previous suicide attempts compared with patients without CCPD. Greater suicidal ideation in depressed patients with CCPD in our study was associated with more hostility. Future studies examining the relationship between suicidal ideation and hostility in CCPD may clarify whether treatment focused on hostility might be of use for decreasing suicidal ideation in depressed patients with CCPD (Spitzer, Williams, Gibbon et al., 1990).
Keywordscluster C personality disorders; depression; hostility; suicide Whereas there is strong support for an association of other personality disorders, such as cluster B personality disorders with suicidal behavior (Corbitt, Malone, Haas et al., 1996;Isometsa, Henriksson, Heikkinen et al., 1996;Lecrubier, 2001 Sher, Oquendo, & Mann, 2001), reports about cluster C personality disorders (CCPD) (fearful/avoidant cluster) are mixed. Few studies have investigated the association between CCPD (obsessive-compulsive, avoidant, and dependent) and suicidal behavior. In a longitudinal study of a community sample, Johnson, Cohen, Skodol, et al. (1999) reported that patients with CCPD were at increased risk for suicidal behavior even after controlling for affective disorders. In psychological autopsy studies, Brent, Johnson, Perper, et al. (1994) reported a higher prevalence of probable or definite cluster C PD among adolescent suicide victims than in controls, and Foster, Gillespie, McClelland, et al. (1999) reported CCPD as a suicide risk factor even after adjustment for axis I disorders in adults. On the other hand, Isometsa, Henriksson, Heikkinen, et al. (1996) found no differences between adult suicide victims with CCPD and controls in any of the examined variables including a history of previous suicide attempt. Chioqueta and Stiles (2004) investigated the relationship between specific disorders within cluster C and suicide attempt in a study of psychiatric outpatients, and found that only dependent personality disorder, but not obsessivecompulsive and avoidant PD, was associated with suicide attempt. Of interest, this association disappeared after controlling for co-morbid depressive disorder.Yet, co-occurrence of personality disorders of more than one cluster has been reported to be associated with increased suicide risk (Schneider, Watterling, Sargk et al., 2005). In this context, in a community sample, 32% of subjects who met criteria for a personality disorder had diagnoses in 2 or more PD clusters (Johnson, Cohen, Skodo et al., 1999). In the studies of suicidal behavior in CCPD subjects cited above, co-morbidity of other PDs, which could affect the associ...