Dacarbazine/analogs & derivatives; Repressor Proteins/metabolism; beta Catenin/metabolism; Animals; Antineoplastic Agents, Alkylating/pharmacology; Antineoplastic Agents, Alkylating/therapeutic use; Apoptosis/drug effects; Blotting, Western; Brain Neoplasms/drug therapy; Brain Neoplasms/metabolism; Brain Neoplasms/pathology; Caspase 3/metabolism; Caspase 7/metabolism; Cell Line, Tumor; Cell Proliferation/drug effects; Dacarbazine/pharmacology; Dacarbazine/therapeutic use; Drug Resistance, Neoplasm; Glioma/drug therapy; Glioma/metabolism; Glioma/pathology; Humans; Kruppel-Like Transcription Factors; Mice; RNA Interference; RNA, Small Interfering/metabolism; Real-Time Polymerase Chain Reaction; Repressor Proteins/antagonists & inhibitors; Repressor Proteins/genetics; Temozolomide; Xenograft Model Antitumor Assays; beta Catenin/antagonists & inhibitors; beta Catenin/genetics