The persistent detection of CTC during follow-up did not correlate with the patient's and/or tumor's characteristics, such as age (p = 0.197), menopausal status (p = 0.372), tumor size (p = 0.637), lymph node status (p = 0.082), histopathological grade (p = 0.746) and hormone receptor status (p = 0.156). This evidence concerns the gene NR4A1 and neoplasm.