The T cell‐like B cells in GC was further confirmed in the metastatic lymph node LN2 and two new GC metastases we obtained (LN3 from the patient who had GC with lymph node metastasis; O2 from the patient who had GC with ovary metastasis) with the marker genes CD19 and CD3D (Figure S9). Here, CD3D is linked to gastric cancer.