ERBB2 and neoplasm: We revealed that there was a low expression of HER2 and moderate expression of Keratin through the violin plot analysis (Fig. 5d) and that 69.89% of the cells had some Keratin positivity, 36.14% Her2 positivity, and 34.05% were double positive, overlapping with the single populations; therefore, it is likely a tumor cell population that also contains non-tumor cells within the cluster.