ERBB2 and neoplasm: Similarly, for BT-474-TR xenografted miceadministered with 1× PBS and nonspecific IgG antibodies, theextracted tumors had average weights of 0.43 and 0.023 g, respectively(Figure 5c, right graph).In contrast, BT-474-TR xenografted mice treated with anti-HER2 VHH-FcKexhibited no tumor growth, while those treated with Trastuzumab hadtumors with a weight of 0.029 g (Figure 5c, right graph).