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OBJECTIVE	To provide the 4-week prevalence estimates of mental disorders in cancer populations .
METHODS	We enrolled adult patients with cancer from in - and outpatient care facilities , using a proportional stratified random sample based on the nationwide cancer incidence in Germany .
METHODS	Patients who scored 9 or above on the Patient Health Questionnaire ( PHQ-9 ) were administered to the standardized computer-assisted Composite International Diagnostic Interview for mental disorders adapted for cancer patients ( CIDI-O ) .
METHODS	A random sample of those with a PHQ-9 score that was less than 9 were selected for a CIDI-O .
RESULTS	A total of 5,889 patients were identified , which led to 4,020 participants ( a 68.3 % response rate ) ; of those , 2,141 patients were interviewed .
RESULTS	The 4-week total prevalence for any mental disorder was 31.8 % ( 95 % CI , 29.8 % to 33.8 % ) ; this included any anxiety disorder ( 11.5 % ; 95 % CI , 10.2 % to 12.9 % ) , any adjustment disorder ( 11.1 % ; 95 % CI , 9.7 % to 12.4 % ) , any mood disorder ( 6.5 % ; 95 % CI , 5.5 % to 7.5 % ) , any somatoform/conversion disorder ( 5.3 % ; 95 % CI , 4.3 % to 6.2 % ) , nicotine dependence ( 4.5 % ; 95 % CI , 3.6 % to 5.4 % ) , alcohol abuse/dependence ( 0.3 % ; 95 % CI , 0.1 % to 0.6 % ) , any mental disorder resulting from general medical condition ( 2.3 % ; 95 % CI , 1.7 % to 2.9 % ) , and any eating disorder ( 0 % ) .
RESULTS	The highest prevalence for any mental disorder was found in patients with breast cancer ( 41.6 % ; 95 % CI , 36.8 % to 46.4 % ) , followed by patients with head and neck cancer ( 40.8 % ; 95 % CI , 28.5 % to 53.0 % ) .
RESULTS	The lowest prevalence was found in patients with pancreatic cancer ( 20.3 % ; 95 % CI , 8.9 % to 31.6 % ) and stomach/esophagus cancers ( 21.2 % ; 95 % CI , 12.8 % to 29.6 % ) .
CONCLUSIONS	Our findings provide evidence for the strong need for psycho-oncological interventions .

