Abstract:
:The management of metastatic melanoma is a difficult matter. Nevertheless, the advent of target therapy has significantly improved patient outcome, provided that tumor molecular characteristics become available: the detection of drug-resistant clones can contribute to understanding the reasons for resistance onset, influencing the choice of subsequent therapy. This work aimed to provide a possible explanation for the early resistance to vemurafenib developed by a patient with melanoma, and concurrently to assess the extent, and role, of the tumor clonal heterogeneity. We analyzed tissue samples from different sites and time points: first/second primary, three lymph node metastases, and circulating melanoma cells (CMCs). We first investigated these samples by the routine Sanger sequencing for BRAF, NRAS, and KIT, and then, we focused on specific hotspots by droplet digital PCR. We detected a BRAF V600E mutation by Sanger sequencing in the second primary and distant lymph node metastases, but not in the first primary or sentinel lymph node. Interestingly, by droplet digital PCR, the V600E mutation was also detected in the first primary, and the V600K in the second primary and metastases. Moreover, we identified a rare KIT V569G mutation, appearing to be CMC exclusive. This finding confirms the potential of CMCs as a source of tumor material for genetic analysis, reflecting real-time systemic disease evolution and, most likely, the most aggressive, treatment-resistant clones. In summary, this work underlines the importance of CMCs in the early identification of tumor clones putatively responsible for therapy resistance.
journal_name
Melanoma Resjournal_title
Melanoma researchauthors
Scaini MC,Pigozzo J,Pizzi M,Manicone M,Chiarion-Sileni V,Zambenedetti P,Rugge M,Zanovello P,Rossi E,Zamarchi R,Facchinetti Adoi
10.1097/CMR.0000000000000510subject
Has Abstractpub_date
2019-02-01 00:00:00pages
89-94issue
1eissn
0960-8931issn
1473-5636journal_volume
29pub_type
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journal_title:Melanoma research
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journal_title:Melanoma research
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journal_title:Melanoma research
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journal_title:Melanoma research
pub_type: 杂志文章
doi:
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journal_title:Melanoma research
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pub_type: 杂志文章
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journal_title:Melanoma research
pub_type: 杂志文章
doi:10.1097/00008390-199504000-00009
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pub_type: 杂志文章,meta分析,评审
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