What is the role of consolidation and maintenance therapy in older patients with APL?
Consolidation therapy is recommended with ATRA+ATO as a standard consideration for most patients when available, although protocol-based treatments may vary. For those older adults treated with chemotherapy+ATRA for high-risk disease, decreased anthracycline [chemotherapy] exposure during consolidation results in less mortality risk. Maintenance therapy is not needed when ATRA+ATO are used for induction and consolidation and after achieving a molecular remission.
What other patient factors should influence treatment decisions?
In practice, older age, concurrent comorbid conditions [particularly cardiac disease], and physical function may all influence treatment decisions. Regarding the disease itself, a high white blood cell count at diagnosis, which is classified as higher-risk disease, directs choice of therapy, particularly for fit older adults. Cardiac disease can limit certain treatment options because of risk of side effects. In particular, the use of anthracycline chemotherapy is contraindicated for people with heart failure, and the use of ATO can increase risk of arrhythmia and is not used with certain EKG findings.
Special considerations in older patients with APL
How would you characterize older individuals’ involvement in clinical trials?
Older adults are underrepresented on clinical trials, with very limited inclusion of those over age 75 years. Some APL trials have had upper age exclusions, which is something we have advocated to remove.
Are there unique challenges in diagnosing older adults with APL?
The presentation of APL with low blood counts can look similar to other types of AML or myelodysplastic syndrome when reviewing routine lab results. If additional testing is not done quickly, the diagnosis will be missed, as well as the opportunity for effective treatment. Rapid diagnosis is essential in this disease.
Are there age-related differences in the presentation of APL?
There are no available data to support more-aggressive APL biology in older adults.
How does age impact the outcomes of patients with APL?
Although the outcomes in APL have improved, the survival difference between age groups has not decreased in recent years and the magnitude of improvement in survival in older patients still lags behind younger patients. Older age is also associated with worse outcomes driven largely by increased early death, with greater rates of infection and multiorgan failure leading to a decreased overall survival.
How important is a geriatric assessment for older patients with APL? What role does it play in management?
There are no data on the use of a geriatric assessment specifically in APL, although a geriatric assessment is recommended for older adults starting new chemotherapy in general. A geriatric assessment may help determine who is fit enough to be treated like a younger patient, which has the greatest implications for those with high-risk disease where chemotherapy would be added.
A geriatric assessment can also play an important role in management by identifying vulnerabilities that could be addressed to minimize complications during treatment regardless of the type of treatment given. An example would be identifying and addressing polypharmacy (commonly defined as ≥5 medications). One challenge faced when treating older patients is the use of multiple concomitant medications. Polypharmacy is common among older patients with cancer. Among older adults, each new drug increases the risk of adverse drug events by 10%. Drugs commonly used for the treatment of APL, such as ATRA and ATO, have many potential drug interactions, which must be carefully assessed by a pharmacist prior to and during treatment. Active deprescribing of medications that are not critical during treatment for APL should be done to minimize risks.