Of the factors examined, race, Eastern Cooperative Oncology Group performance status (ECOG PS), bone-only disease, visceral disease, presence of liver metastases, PgR status, tumor grade, and number of organs at baseline were found to be significant, whereas age, presence of lung metastases, presence of pleural metastases, and prior neoadjuvant or adjuvant chemotherapy were not (Table 1). Here, PGR is linked to neoplasm.