ERBB2 and breast cancer: SA-CMD-MNPs exhibited high dispersity (polydispersity index= 0.058) in a neutral phosphate buffer and maintained it for 182 dayswith dispersion using a probe sonicator (5 s) before DLS characterization.The performance of the SA-CMD-MNPs in biosensing was evaluated byimmunohistochemistry, which revealed that the nanoparticles couldspecifically stain MCF-7 cells derived from breast cancer cells withlow HER2 expression.