ERBB2 and neoplasm: The presence of CTCs in the peripheral blood after resection of the primary tumor, but before adjuvant chemotherapy, was not significantly associated with patient characteristics (age and menopausal status), tumor characteristics (tumor stage, lymph node status, grading, histological type, hormone receptor status and HER2 status), surgical procedures (breast conserving therapy vs. mastectomy), or therapeutic regimens (Table 1).