Anew study raises an alarm over polypharmacy, an issue that is not new but may become more worrisome because of an aging population and a myriad of new drugs coming to market, including cancer drugs. The study appears in Cancer (doi:10.1002/cncr.34642).
Corresponding author Erika Ramsdale, MD, MS, geriatric oncologist and associate professor of hematology/oncology in the Department of Medicine at the University of Rochester in Rochester, New York, warns that although there is some evidence that cancer treatment outcomes may be affected by taking multiple medications and/or potentially inappropriate medications (PIMs), “the research is still very sparse.”
Dr Ramsdale says that the main goal of this new study was to examine the associations between polypharmacy, PIMs, and potential drug–drug interactions (PDIs) and adverse cancer treatment outcomes in a large national cohort of older adults with advanced cancer. The authors note that polypharmacy and PIMs have suspected roles in many adverse events in older patients with cancer, including toxicities, but cause and effect links have been unclear.
This secondary analysis uses data from an earlier nationwide, multicenter, cluster-randomized study by the same team that appeared in The Lancet (doi:10.1016/S01406736(21)01789-X). Known as the Geriatric Assessment for Patients 70 Years and Older (GAP70+) study, it assessed clinician-rated grade 3–5 chemotherapy toxicity in older adults with advanced cancer who were undergoing a new cancer treatment regimen.
In the Cancer study, the authors note that a host of variables exist beyond the age and possible disabilities of the patients. Other factors that can contribute to difficulties include health care system–level issues, such as poor transitions of care, interdepartmental communication, multiple pharmacies, and “prescribing cascades.”
There were 718 patients enrolled in the study between July 2014 and March 2019 who had provided written consent. The subjects ranged in age from 70 to 94 years, were predominantly male (56.4%) and non-Hispanic White (87.5%), and had a stage III/IV solid tumor or lymphoma (87.5%). Gastrointestinal cancer was the most common type (246 patients; 34.3%), and it was followed by lung cancer (180 patients; 25.1%).
Four hundred forty of the 718 patients (61.3%) were taking five or more medications, 198 (27.6%) were taking eight or more, and 104 (14.5%) were taking more than 10. The researchers found that 447 patients (62.3%) received one or more PIMs according to the 2019 American Geriatrics Society Beers Criteria (range, 0–8 PIMs), and 206 (28.7%) received at least one PIM according to the Screening Tool of Older Persons’ Prescriptions (STOPP) criteria. All told, there were 482 patients (67.1%) with one or more PIMs.
There were 177 patients who had at least one potentially major PDI (category D or X).
The researchers found that the mean number of grade 2 or high