The significance of the Interpersonal-Psychological Theory of Suicide in an oncological context-A scoping review

To what extent are psychological variables considered in the study of risk and protective factors for suicidal thoughts and behaviours in individuals with cancer? A systematic review of 70 years of research

Psychological variables substantially shape the risk of suicidal thoughts and behaviours (STBs). However, it is unclear to what extent they are considered in individuals with cancer. We synthesized the quantitative research landscape concerning psychological risk/protective factors of STBs in the (psycho-) oncological context. This pre-registered review (PROSPERO-ID CRD42022331484) systematically searched the databases PubMed/Medline, CINAHL, PsycInfo, Cochrane Library, and Web of Science (as well as the grey literature and preprints). Risk of bias (RoB) was estimated using the ROBINS-I tool. Of 11,159 retrieved records, 319 studies were eligible for inclusion. Of those, 163 (51.1%) had investigated psychological factors (affective: n = 155; social: n = 65; cognitive: n = 63; personality/individual differences: n = 37; life events: n = 6), in a combined 3,561,741 participants. The most common STBs were suicidal ideation (n = 107) or death wishes (n = 20) rather than behaviour (suicide deaths: n = 26; attempts: n = 14). Most studies had a serious RoB. Thus, a large body of research investigated STBs in cancer patients/survivors, but it rarely aligned with the theoretical or clinical developments in suicide research. We propose a conceptual model of STBs in cancer delineating moderation and mediation effects to advance the integration of the fields, and to inform future research and practice.

Suicide risk following a new cancer diagnosis among Veterans in Veterans Health Administration care

BACKGROUND

Cancer diagnoses are associated with an increased risk for suicide. The aim of this study was to evaluate this association among Veterans receiving Veterans Health Administration (VHA) care, a population that has an especially high suicide risk.

METHODS

Among 4,926,373 Veterans with VHA use in 2011 and in 2012 or 2013, and without VHA cancer diagnoses in 2011, we assessed suicide risk following incident cancer diagnoses. Risk time was from initial VHA use in 2012-2013 to 12/31/2018 or death, whichever came first. Cox proportional hazards regression models evaluated associations between new cancer diagnoses and suicide risk, adjusting for age, sex, VHA regional network, and mental health comorbidities. Suicide rates were calculated among Veterans with new cancer diagnoses through 84 months following diagnosis.

RESULTS

A new cancer diagnosis corresponded to a 47% higher suicide risk (Adjusted Hazard Ratio [aHR] = 1.47, 95% CI: 1.33-1.63). The cancer subtype associated with the highest suicide risk was esophageal cancer (aHR = 6.01, 95% CI: 3.73-9.68), and other significant subtypes included head and neck (aHR = 3.55, 95% CI: 2.74-4.62) and lung cancer (aHR = 2.35, 95% CI: 1.85-3.00). Cancer stages 3 (aHR = 2.36, 95% CI: 1.80-3.11) and 4 (aHR = 3.53, 95% CI: 2.81-4.43) at diagnosis were positively associated with suicide risk. Suicide rates were highest within 3 months following diagnosis and remained elevated in the 3-6- and 6-12-month periods following diagnosis.

CONCLUSION

Among Veteran VHA users, suicide risk was elevated following new cancer diagnoses. Risk was particularly high in the first 3 months. Additional screening and suicide prevention efforts may be warranted for VHA Veterans newly diagnosed with cancer.

Exploring interpersonal theory of suicide typologies in patients with cancer: A latent profile analysis

The current study examined patterns of endorsement of Interpersonal Theory of Suicide constructs in a group of patients with cancer (N = 133) via Latent Profile Analysis. Four profiles were identified: (1) Interpersonally Distressed (n = 7; 5.2%), (2) Burdened (n = 11; 8.3%), (3) Fearless About Death (n = 40; 30.1%), (4) Non-Distressed (n = 75; 56.4%). Profiles with higher levels of thwarted belongingness, perceived burdensomeness, and hopelessness were associated with greater suicide ideation. Results also suggest there may be characteristics of patients with cancer that require unique consideration about the potential meaning and relevance of such constructs.

The significance of the Interpersonal-Psychological Theory of Suicide in an oncological context-A scoping review

OBJECTIVES

Since individuals afflicted with cancer are at an elevated risk of dying by suicide, understanding suicide-related ideation and behaviours is critical in identifying vulnerable patients. The interpersonal theory of suicide (IPTS) provides a framework to research risk factors for suicide and has been validated in different samples. The aim of this scoping review is to study literature related to IPTS and cancer patients.

METHODS

This scoping review was registered with the OPEN Science Framework (osf.io/92465). The databases PsycINFO, Web of Science, PubMed and PubMed Central were searched. Eligible research needed to use a minimum of one psychometric element to measure at least one of the factors of the IPTS in individuals with cancer.

RESULTS

Ninety-six studies were identified and screened. Eligible research included individuals with cancer and the use of at least one measurement of at least one of the factors of the IPTS. Overall, four articles met the inclusion criteria and three studies found significant associations of components of the IPTS and suicidal ideation/behaviour.

CONCLUSION

While these initial findings support the notion that the IPTS is relevant for individuals with cancer as well, a direct validation of the IPTS in cancer patients is needed.