γ-Aminobutyric Acid as a Promoting Factor of Cancer Metastasis; Induction of Matrix Metalloproteinase Production Is Potentially Its Underlying Mechanism

Haruhito Azuma, Teruo Inamoto, Takeshi Sakamoto, Satoshi Kiyama, Takanobu Ubai, Yuko Shinohara, Kentaro Maemura, Motomu Tsuji, Naoki Segawa, Hiroshi Masuda, Kiyoshi Takahara, Yoji Katsuoka, Masahito Watanabe