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학술저널
저자정보
윤상은 (삼성서울병원) 김연정 (삼성서울병원) 심준호 (성균관대학교) 박동현 (삼성서울병원) 조준훈 (삼성서울병원) 고영혜 (삼성서울병원) 박웅양 (삼성서울병원) 문영철 (이화여자대학교) 이경은 (이화여자대학교) 조덕 (삼성서울병원) 김원석 (성균관대학교) 김석진 (성균관대학교)
저널정보
대한암학회 Cancer Research and Treatment Cancer Research and Treatment 제54권 제2호
발행연도
2022.4
수록면
597 - 612 (16page)
DOI
10.4143/crt.2021.752

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PurposeAnalysis of circulating tumor DNA (ctDNA) in blood could allow noninvasive genetic analysis of primary tumors. Although there have been unmet needs for noninvasive methods in patients with primary central nervous system lymphoma (PCNSL), it is still not determined whether plasma ctDNA analysis could be useful for patients with PCNSL. Materials and MethodsTargeted deep sequencing of 54 genes was performed in cell-free DNA isolated from plasma samples collected pretreatment, during treatment, and at the end of treatment in 42 consecutively diagnosed PCNSL patients between January 2017 and December 2018.ResultsTargeted sequencing of plasma cell-free DNA detected somatic mutations representing ctDNA in 11 cases (11/41, 27%). The detection of ctDNA was not related to the concentration of cell-free DNA or tumor volume. The mutation profiles of these 11 cases varied between patients. The most frequently mutated gene was PIM1 (4/11, 36.4%), whereas KMT2D, PIK3CA, and MYD88 were each observed in three patients (3/11, 27%). The mutations of 13 genes were concordantly found in primary tumor tissue and plasma ctDNA, giving a detection sensitivity of 45%. During the serial tracking of seven patients with complete response, the disappearance of ctDNA mutations was found in four patients, whereas three patients had detected ctDNA mutation at the end of treatment. ConclusionThe plasma ctDNA mutation analysis still has limited value for surveillance and predicting treatment outcomes of PCNSL because the detection efficiency was lower than other systemic lymphomas. Thus, analytical platforms should be improved to overcome anatomical hurdles associated with PCNSL.

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