Table 1 summarized the frequency and proportion of some characteristics of these patient groups. There were a series of significant differences among the cohorts of patient samples including PgR status, bone-only metastasis, and visceral metastasis (P < 0.05). It was noticed that younger patients had obviously higher rate of PgR positive (83.2 vs.77.5%, P = 0.002) and bone-only metastasis (28.0 vs 23.5%, P = 0.015) in our study. On the contrary, elder group tended to have visceral metastasis than younger patients (47.0 vs 42.4%, P = 0.028). Here, PGR is linked to bone metastasis.