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The phenotypic and molecular profile of circulating tumor cells (CTCs) can provide key information about the biology of tumor cells, contributing to personalized therapy. CTC isolation is still challenging, mainly due to their heterogeneity and rarity. To overcome this limitation, a microfluidic chip for label-free isolation of CTCs from peripheral blood was developed. This device, the CROSS chip, captures CTCs based on their size and deformability with an efficiency of 70%. Using 2 chips, 7.5\u2009ml of whole blood are processed in 47\u2009minutes with high purity, as compared to similar technologies and assessed by <jats:italic>in situ<\/jats:italic> immunofluorescence. The CROSS chip performance was compared to the CellSearch system in a set of metastatic colorectal cancer patients, resulting in higher capture of DAPI+\/CK+\/CD45\u2212 CTCs in all individuals tested. Importantly, CTC enumeration by CROSS chip enabled stratification of patients with different prognosis. Lastly, cells isolated in the CROSS chip were lysed and further subjected to molecular characterization by droplet digital PCR, which revealed a mutation in the <jats:italic>APC<\/jats:italic> gene for most patient samples analyzed, confirming their colorectal origin and the versatility of the technology for downstream applications.<\/jats:p>","DOI":"10.1038\/s41598-019-44401-1","type":"journal-article","created":{"date-parts":[[2019,5,29]],"date-time":"2019-05-29T10:02:24Z","timestamp":1559124144000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":92,"title":["Fast and efficient microfluidic cell filter for isolation of circulating tumor cells from unprocessed whole blood of colorectal cancer patients"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0908-0874","authenticated-orcid":false,"given":"Silvina","family":"Ribeiro-Samy","sequence":"first","affiliation":[]},{"given":"Marta I.","family":"Oliveira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4473-7608","authenticated-orcid":false,"given":"Thais","family":"Pereira-Veiga","sequence":"additional","affiliation":[]},{"given":"Laura","family":"Muinelo-Romay","sequence":"additional","affiliation":[]},{"given":"Sandra","family":"Carvalho","sequence":"additional","affiliation":[]},{"given":"Jo\u00e3o","family":"Gaspar","sequence":"additional","affiliation":[]},{"given":"Paulo P.","family":"Freitas","sequence":"additional","affiliation":[]},{"given":"Rafael","family":"L\u00f3pez-L\u00f3pez","sequence":"additional","affiliation":[]},{"given":"Clotilde","family":"Costa","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3695-6963","authenticated-orcid":false,"given":"Lorena","family":"Di\u00e9guez","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2019,5,29]]},"reference":[{"key":"44401_CR1","doi-asserted-by":"publisher","first-page":"531","DOI":"10.1038\/nrclinonc.2017.14","volume":"14","author":"G Siravegna","year":"2017","unstructured":"Siravegna, G., Marsoni, S., Siena, S. & Bardelli, A. 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