Lithium carbonate suppresses tumor metastasis to the lymph nodes.
(a) Lateral axillary lymph node morphology of tumor-bearing groups (n = 5 per group). (b,d) Hematoxylin and eosin and CCR7 staining of frozen sections of lateral axillary lymph node tissues isolated from mice subcutaneously injected with SW620 cells. (c) The incidence of metastasis per lateral axillary lymph node was quantified by microscopic analysis. Data are presented as the mean ± s.e. **P < 0.01 vs. control group.