sentence1: Recently, miR-126 was identified as a metastasis suppressing miRNA that is downregulated in relapsing breast cancer, leukemia, and cervical cancer.
sentence2: MiR-155 is upregulated in several human tumors, such as chronic lymphocytic leukemia, melanoma, head and neck squamous cell carcinoma, clear-cell kidney cancer , hepatocellular carcinoma, lymphoma, thyroid carcinoma], breast cancer, colon cancer, cervical cancer, pancreatic cancer, and lung cancer.