ERBB2 and neoplasm: Although Shannon entropy scores, H, indicating the diversity of BCRs, were not significantly different between the high HER2‐AAb group and low HER2‐AAb group, the IgHVJ distributions were skewed in most of the cases of both groups (Figure 4; Figure S1), suggesting that tumor‐infiltrating B cells were involved in specific immune responses regardless of the HER2‐AAb status.