ERBB2 and breast cancer: Compared with other patients, patients with bone metastases from HR‐positive/HER2‐negative breast cancer were older (P < 0.001), were more likely to be white (P < 0.001), had a higher rate of lobular histology (P < 0.001), had a lower tumor grade (P < 0.001), and had a higher household income (P < 0.001).