Carcinoma, Squamous Cell/prevention & control; Lung Neoplasms/prevention & control; Receptors, CXCR4/metabolism; Salivary Gland Neoplasms/prevention & control; Animals; Benzylamines; Blotting, Western; Carcinoma, Squamous Cell/metabolism; Carcinoma, Squamous Cell/secondary; Cell Adhesion; Cell Movement; Chemokine CXCL12/genetics; Chemokine CXCL12/metabolism; Cyclams; Enzyme-Linked Immunosorbent Assay; Flow Cytometry; Heterocyclic Compounds/pharmacology; Humans; Immunoenzyme Techniques; Lung Neoplasms/metabolism; Lung Neoplasms/secondary; Lymphatic Metastasis; Mice; Mice, Inbred BALB C; Mice, Nude; Mitogen-Activated Protein Kinase 3/genetics; Mitogen-Activated Protein Kinase 3/metabolism; RNA, Messenger/genetics; Real-Time Polymerase Chain Reaction; Receptors, CXCR4/genetics; Reverse Transcriptase Polymerase Chain Reaction; Salivary Gland Neoplasms/metabolism; Salivary Gland Neoplasms/pathology; Tumor Cells, Cultured