학술논문
The impact of genomic testing on the recommendation for radiation therapy in patients with ductal carcinoma in situ: A prospective clinical utility assessment of the 12-gene DCIS score™ result
Document Type
Academic Journal
Author
Source
Journal of Surgical Oncology. Jun 15, 2015 111(8):935-940
Subject
Language
English
ISSN
0022-4790
Abstract
BACKGROUND AND OBJECTIVES:: Twenty percent of breast cancers are ductal carcinoma in situ (DCIS), with 15–60% having a local recurrence (LR) after surgery. Radiotherapy reduces LR by 50% but has not impacted survival. The validated Oncotype DX 12-gene assay (DCIS Score) provides individualized 10-year LR estimates. This is the first study to assess whether DCIS Score impacts physicians' recommendations for radiation. METHODS:: Ten sites enrolled women (9/2012–2/2014) with DCIS eligible for breast-conserving therapy, excluding patients with invasive carcinoma and planned mastectomy. Prospective data collected included clinicopathologic factors, DCIS Score assay, and treatment recommendation before and after the assay result was known. RESULTS:: In 115 patients (median age: 61 years; 74.8% postmenopausal), median DCIS size was 8 mm; 20% were nuclear grade 1, 46.1% grade 2; 64.4% reported necrosis. 86.1% were ER+, 79.1% PR+ (immunohistochemistry assay). Median DCIS Score: 29 (range: 0–85). Pre-assay, 73% (95%CI: 64.0–80.9%) had radiotherapy recommendations vs. 59.1% (95%CI: 49.6–68.2%) post-assay (P= 0.008). Physicians rated DCIS Score as the most impactful factor in planning treatment. CONCLUSIONS:: The radiotherapy recommendation changed from pre-assay to post-assay 31.3% (95%CI: 23.0–40.6%) of the time—a clinically significant change. This study supports the clinical utility of the DCIS Score and indicates that the test provides additional, individualized information on LR risk. J. Surg. Oncol. 2015 111:935–940. © 2015 Wiley Periodicals, Inc.