Non-cancer medications for patients with incurable cancer: time to stop and think?

Patterns of statin initiation and continuation in patients with breast or colorectal cancer, towards end-of-life

Purpose

Cross-sectional studies show that statins, used in cardiovascular disease prevention, are often discontinued approaching death. Studies investigating associations between statin exposure and cancer outcomes, not accounting for these exposure changes, are prone to reverse causation bias. The aim of this study was to describe longitudinally the changes in statin initiation and continuation prior to death in patients with breast or colorectal cancer, thus establishing an appropriate exposure lag time.

Methods

This study was carried out using linked cancer registry and prescribing data. We identified patients who died of their cancer (cases) and cancer survivors were used as controls. The probability of initiating or continuing statin use was estimated up to 5 years prior to death (or index date). Conditional binomial models were used to estimate relative risks and risk differences for associations between approaching cancer death and statin use.

Results

Compared to controls, the probability of continued statin use in breast cancer cases was significantly lower 3 months prior to death (RR 0.86 95% CI 0.79, 0.94). Similarly, in colorectal cancer cases, the probability of continued statin use was significantly lower 3 months prior to colorectal cancer death (RR 0.77 95% CI 0.68, 0.88).

Conclusion

A significant proportion of patients will cease statin treatment in the months prior to a colorectal or breast cancer death.

Electronic supplementary material

The online version of this article (doi:10.1007/s00520-017-3576-0) contains supplementary material, which is available to authorized users.

Inappropriate prescribing in patients accessing specialist palliative day care services

BACKGROUND

For patients accessing specialist palliative care day services, medication is prescribed routinely to manage acute symptoms, treat long-term conditions or prevent adverse events associated with these conditions. As such, the pharmacotherapeutic burden for these patients is high and polypharmacy is common. Consequently, the risk of these patients developing drug-related toxicities through drug–drug interactions is exacerbated. Medication use in this group should, therefore, be evaluated regularly to align with achievable therapeutic outcomes considering remaining life expectancy.

OBJECTIVE

To (1) assess the prevalence of inappropriate medication use; (2) identify potential drug–drug interactions; and, (3) determine how many potential drug– drug interactions could be prevented by discontinuing inappropriate medication.

SETTING

A specialist tertiary care palliative care centre in Northern England serving a population of 330,000.

MAIN OUTCOME MEASURE

Prescribing of inappropriate medication.

METHOD

Medication histories for patients accessing a specialist palliative day care centre were established and a modified Delphi method was used to reach consensus of medication appropriateness. The Delphi method utilized a framework considering the following factors: remaining life expectancy of the patient, time until benefit of the treatment, goals of care and treatment targets. Potential drug interactions were established using drug interaction recognition software and categorised by their ability to cause harm.

RESULTS

A total number of 132 patients were assessed during the study period who were prescribed 1,532 (mean = 12/patient) medications; 238 (16 %) were considered inappropriate in the context of limited life expectancy. The most common class of medications considered inappropriate were the statins, observed in 35 (27 %) patients. A total of 267 potential drug–drug interactions were identified; 112 were clinically significant and 155 were not considered clinically significant. Discontinuation of inappropriate medication would reduce the total number of medications taken to 1,294 (mean = 10/patient) and prevent 31 clinically significant potential drug–drug interactions.

CONCLUSION

Patients accessing specialist palliative day care services take many inappropriate medications. These medications not only increase the pharmacotherapeutic burden for the patient but they also contribute to potential drug–drug interactions. These patients should have their medication reviewed in the context of life limiting illness aligned with achievable therapeutic outcomes.

Discontinuation of statin therapy in older people: does a cancer diagnosis make a difference? An observational cohort study using data linkage

OBJECTIVE

The aim was to examine statin discontinuation rates in a cohort of elderly Australians with newly diagnosed cancer using population-based secondary health data.

DESIGN

Observational cohort study.

SETTING

New South Wales, the largest jurisdiction in Australia. The Pharmaceutical Benefits and Repatriation Pharmaceutical Benefits Schemes are national programmes subsidising prescription drugs to the Australian population and Australian Government Department of Veterans' Affairs clients.

PARTICIPANTS

The cohort comprised 1731 cancer patients aged ≥65 years with evidence of statin use in the 90 days prior to diagnosis. They were matched to 3462 non-cancer patients prescribed statins in the same period.

MAIN OUTCOME MEASURE

The authors compared statin discontinuation rates up to 4 years post-diagnosis and examined the factors associated with statin discontinuation.

RESULTS

The proportion of cancer patients discontinuing statin therapy at 4 years (27%) was comparable to the comparison cohort; however, significantly higher proportions of the cancer cohort discontinued statins than the comparison cohort at 3, 6 and 12 months of follow-up (9.7% vs 7.4% at 12 months, respectively). More than 30% of cancer patients who died were dispensed statins within 30 days of death. Discontinuation of statin therapy in cancer patients was associated with regionalised and distant disease spread at diagnosis (p<0.001), older age (p=0.006), upper gastrointestinal organs and liver cancer (aHR 2.95, 95% CI 1.92 to 4.53) and cancer of the lung, bronchus and trachea (aHR 1.99, 95% CI 1.32 to 3.00) and poorer survival.

CONCLUSIONS

Medications should be rationalised at the time of a cancer diagnosis, especially in the setting of a poor prognosis. At least for some patients in our cohort, statin therapy may be inappropriately continued which adds unnecessarily to therapeutic burden.