Press release
New Evidence Published Supporting Use of DecisionDx®-SCC Test in Guiding and Improving Treatment Pathway Decisions in NCCN High-Risk Cutaneous Squamous Cell Carcinoma
New validation study shows DecisionDx-SCC significantly outperforms current staging systems in predicting risk of local recurrence and metastasis for NCCN
About this update from Castle Biosciences, Inc.
[{"type":"text","content":"New validation study shows DecisionDx-SCC significantly outperforms current staging systems in predicting risk of local recurrence and metastasis for NCCN high-risk patients Clinician survey confirms test results align with treatment decision-making thresholds for adjuvant radiation therapy and surveillance imaging FRIENDSWOOD, Texas, Aug. 25, 2025 (GLOBE NEWSWIRE) -- Castle Biosciences, Inc. (Nasdaq: CSTL), a company improving health through innovative tests that guide patient care, today announced the publication of two new studies related to its DecisionDx-SCC test, adding to its validated uses for patients with high-risk cutaneous squamous cell carcinoma (SCC).1,2 DecisionDx-SCC is a gene expression profile test (40-GEP) designed to use a patient’s tumor biology to predict individual risk of metastasis as well as response to adjuvant radiation therapy (ART). The first study represents an expanded clinical use milestone, demonstrating that DecisionDx-SCC predicts local recurrence in patients classified as high-risk by National Comprehensive Cancer Network (NCCN) guidelines who have undergone Mohs resection, thereby adding a third use to the test's existing capabilities.¹ The test has now been shown to predict individual risk of metastasis, response to ART and individual risk of local recurrence, providing comprehensive results to support tailored post-surgical management and treatment pathway recommendations for patients with SCC. The second study shares results from a clinician survey, affirming the impact of the test’s results in guiding these recommendations, specifically the use of ART and surveillance imaging, by providing actionable decision points based on individual patient risk.2 “These new data indicate that DecisionDx-SCC test results provide individualized risk predictions that doctors can use to guide risk-aligned escalation or de-escalation of care in their NCCN high-risk SCC patients,” said Désirée Ratner, M.D., Mohs micrographic surgeon and clinical professor of dermatology at the NYU Grossman School of Medicine in New York. “The ability of the test to reliably identify those patients with NCCN high-risk SCC at risk of developing local recurrence or metastasis is not only practice-changing for physicians who treat SCC, but also life-changing for their patients.” While most patients with NCCN high-risk SCC can ...