Abstract
An important challenge for oncologists is to treat overt metastasis, the major source of cancer-related deaths1. Adjuvant therapy should prevent distant recurrences by targeting residual disseminated tumor cells (DTCs) that give origin to metastasis, as well as existing undetected micrometastasis. Whereas in some cases, such as breast cancer, patients can show delayed metastasis after hormonal therapies (for example, in estrogen receptor–positive tumors) or treatment with trastuzumab, for HER2 (also called ERBB2)-positive tumors2, adjuvant therapy is for the most part ineffective in fully blocking metastasis development and improving overall survival.
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