Background
In December of 2023, the Survivorship Coordinator at VA Connecticut spearheaded a multidisciplinary collaboration to offer PHASER testing to all patients newly diagnosed with a GI malignancy and/ or patients with a known GI malignancy and a new recurrence that might necessitate chemotherapy. The PHASER panel includes two genes that are involved in the metabolism of two commonly used chemotherapy drugs in this patient population.
Methods
By identifying patients who may have impaired metabolism prior to starting treatment, the doses of the appropriate drugs, 5FU and irinotecan, can be adjusted if appropriate, leading to less toxicity for patients while on treatment and fewer lingering side-effects from treatment. We are tracking all of the patients who are being tested and will report quarterly to the Cancer Committee on any findings with a specific focus on whether any dose-adjustments were made to Veteran’s chemotherapy regimens as the result of this testing.
Discussion
We have developed a systematic process centered around GI tumor boards to ensure that testing is done at least two weeks prior to planned chemotherapy start-date to ensure adequate time for testing results to be received. We have developed a systematic process whereby primary care providers and pharmacists are alerted to the PHASER results and patients’ non-oncology medications are reviewed for any recommended adjustments. We will have 9 months of data to report on at AVAHO as well as lessons learned from this new quality improvement process. Despite access to pharmacogenomic testing at VA, there can be variations between VA sites in terms of uptake of this new testing. VA Connecticut’s PHASER testing initiative for patients with GI malignancies is a model that can be replicated throughout the VA. This initiative is part of a broader focus at VA Connecticut on “pre-habilitation” and pre-treatment testing that is designed to reduce toxicity of treatment and improve quality of life for cancer survivors.