ERBB2 and breast neoplasm: SGSM2 had significantly higher expression in ER+, PR+, HER2 – breast tumours than in ER–, PR–, HER2+ tumours (Tukey HSD test, *P = 0.046; Table 1), and an elevated SGSM2 mRNA level was found in well-differentiated tumours (Grade 1) but not in poorly differentiated tumours (Grade 3); however, the results were non-significant (Table 1).