Colorectal cancer Outcomes in people with Severe Mental Illness Cohort (COSMIC): a protocol for an Australian retrospective cohort using linked administrative data

Mental Health Service Contact Following Cancer Diagnosis and Associations with Cancer Mortality: Results from a Linked Population-Based Study of Adolescents and Young Adults in New South Wales

Purpose: To assess the mental health conditions, as indicated by mental health service contact in adolescents and young adults (AYAs) diagnosed with cancer in New South Wales (NSW) and associations with cancer mortality. Methods: In 3998 NSW AYAs diagnosed with cancer in 2005-2017, mental health service contacts were obtained from hospital inpatient records and specified medical and pharmaceutical insurance claims. Odds of postcancer mental health contact were assessed by precancer mental contacts using logistic regression adjusted for sociodemographic and cancer characteristics. The risk of cancer-specific mortality related to postcancer mental health contacts was estimated using competing risk regression. Results: The prevalence of mental health service contacts in the 5 years postcancer diagnosis was 27.0%, higher than the corresponding precancer prevalence of 21.4%. The most common mental health conditions were depression and anxiety. The odds of having a mental health contact postcancer diagnosis were higher in patients with a precancer mental health service contact (adjusted odds ratio 5.69, confidence intervals [95% CIs]: 4.90-6.75). The 5-year cancer-specific survival was 87.9% (95% CI: 85.8-89.8) for patients with a mental health service contact postcancer, which was lower than the 93.9% (95% CI: 93.0-94.7) for patients without this contact. The subhazard ratio (SHR) for cancer mortality in patients having mental health service contact postcancer diagnosis was 1.67 (95% CI: 1.29-2.15), adjusted for sociodemographic characteristics, cancer stage, and precancer mental health status. Conclusion: The prevalence of mental health service contact increased after a cancer diagnosis. Mental health care should be a continued priority for AYA cancer patients, particularly for high-risk groups.

Colorectal cancer treatment in people with severe mental illness: a systematic review and meta-analysis

AIMS

People with severe mental illness (SMI) have a greater risk of dying from colorectal cancer (CRC), even though the incidence is lower or similar to that of the general population This pattern is unlikely to be solely explained by lifestyle factors, while the role of differences in cancer healthcare access or treatment is uncertain.

METHODS

We undertook a systematic review and meta-analysis on access to guideline-appropriate care following CRC diagnosis in people with SMI including the receipt of surgery, chemo- or radiotherapy. We searched for full-text articles indexed by PubMed, EMBASE, PsychInfo and CINAHL that compared CRC treatment in those with and without pre-existing SMI (schizophrenia, schizoaffective, bipolar and major affective disorders). Designs included cohort or population-based case-control designs.

RESULTS

There were ten studies (sample size = 3501-591 561). People with SMI had a reduced likelihood of surgery (RR = 0.90, 95% CI 0.92-0.97; p = 0.005; k = 4). Meta-analyses were not possible for the other outcomes but in results from individual studies, people with SMI were less likely to receive radiotherapy, chemotherapy or sphincter-sparing procedures. The disparity in care was greatest for those who had been psychiatric inpatients.

CONCLUSIONS

People with SMI, including both psychotic and affective disorders, receive less CRC care than the general population. This might contribute to higher case-fatality rates for an illness where the incidence is no higher than that of the general population. The reasons for this require further investigation, as does the extent to which differences in treatment access or quality contribute to excess CRC mortality in people with SMI.