On May 5, 2021 Castle Biosciences, Inc. (Nasdaq: CSTL), a skin cancer diagnostics company providing personalized genomic information to improve cancer treatment decisions, reported data on its 15-gene expression profile (15-GEP) test, DecisionDx-UM, at the Association for Research in Vision and Ophthalmology (ARVO) 2021: Revolutionary Eye and Vision Research Meeting (Press release, Castle Biosciences, MAY 5, 2021, View Source [SID1234579228]).

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The virtual poster is entitled "Uveal Melanoma Patient Attitudes Towards Prognostic Testing Using Gene Expression Profiling."

DecisionDx-UM, the test highlighted in the poster, is Castle’s prognostic 15-GEP test for patients with uveal melanoma, a rare cancer of the eye that carries a high risk of spreading (metastasizing). The DecisionDx-UM test is designed to accurately identify patients who are at low risk (Class 1) or high risk (Class 2) of metastasis based on the unique biology of their primary tumor and is the current standard of care in the management of uveal melanoma at the majority of U.S. ocular oncology practices.

"Up to half of patients diagnosed with uveal melanoma will experience metastatic disease, and prior studies show that newly diagnosed patients have overwhelmingly been in favor of learning their prognoses," said first author Basil K. Williams, M.D., assistant professor and director of Ocular Oncology at the University of Cincinnati College of Medicine. "This study demonstrated that uveal melanoma patients were satisfied with their decisions to pursue prognostic information through GEP testing, and they found particular value in DecisionDx-UM’s ability to help them understand their individual metastatic risk."

Study methods and findings:

The objective of the patient-based study was to understand uveal melanoma patients’ experiences following testing with DecisionDx-UM compared to patients with alternative or no prognostic testing.
An online questionnaire was distributed by the Melanoma Research Foundation’s CURE OM (Ocular Melanoma) initiative that captured de-identified information regarding patient-reported experiences. Patients were asked questions regarding the decision to undergo prognostic testing and the extent to which they felt regret about their decisions.
Of the 177 survey participants, 159 (90%) reported wanting prognostic information at diagnosis.
Of patients tested with DecisionDx-UM, the vast majority (80/81 respondents, 99%) reported gaining value from their test result, including:
Increased knowledge and understanding
More personalized treatment options
Information relevant to life planning
A sense of relief from uncertainty about the future
Of the patients who received prognostic testing with DecisionDx-UM, decision regret levels did not differ depending on whether they received a low or high-risk test result (Kruskal-Wallis; n=28, 23, 30 for 1A, 1B, 2; p=0.13).
Patients who received prognostic testing experienced lower levels of decision regret than those who opted out of testing, independent of which prognostic tests were used (Wilcoxon Rank-Sum tests: DecisionDx-UM vs. alternative tests: p=0.89, DecisionDx-UM vs. opt-out: p=0.0002, alternative tests vs. opt-out: p=0.003).