PGR and neoplasm: As shown in Table 1, a statistically significant association of α3 staining in the Pantomics array was observed with tumor grade (p = 0.027; chi-square test for trend) and HER2 (human epidermal growth factor receptor 2) status (p = 0.013), but not with ER (estrogen receptor) status, PR (progesterone receptor) status, or tumor stage.