ALDH1A1 and neoplasm: The proliferation rate and clonogenicity of SW-684, SW-982, and SW-1353 ALDH1high cells in vitro were significantly higher than that of ALDH1low cells, consistent with the characteristics of the high ALDH1 activity phenotype in other cancer cells [33], [34], which may indicate that ALDH1high cells from sarcoma are partially responsible for tumor metastasis and recurrence and should be focused during the cancer therapy.