Scientific Reports 7:4510; doi:10.1038/s41598-017-04601-z; Article published online 03 July 2017

In the original version of this Article, size-based CTC-isolation is erroneously referred to as ‘ISET’. ‘ISET’ is a Trademark of Rarecells. The two incidences of ‘ISET’ (in the abstract and the ‘CTC isolation method’ section) have been removed.