Despite efforts to eradicate breast cancer by surgery, 25 to 30 percent of women with newly diagnosed breast cancer will have hidden metastases too small to produce symptoms at first.
उपचार से बच निकलनेवाली कोशिकाएँ रसायन - प्रतिरोधक ट्यूमरों की एक नई पीढ़ी को जन्म दे सकती हैं ।