The invention refers to pharmaceutical compositions which have an enhanced antitumor activity or reduced side effect comprising a known active substance having antitumor effect or a pharmaceutically acceptable salt thereof and a hydroximic acid derivative of formula or a therapeutically useful acid addition salt thereof. A variable compression member has a normal height, under normal operating temperature conditions, adapted to provide a normal compressive force between the gas cartridge and the inlet to effectively seal the gas cartridge to the inlet. Meanwhile, as the adapter has an entirely metal case, its strength is also enhanced. The balance circuit board and the inverter circuit board are installed separately, and the balance circuit board has a balance circuit coupled to a terminal of each CCFL and the inverter circuit. Further installed security is provided by the backstop engaging the upper leading edge of the adjacent batten. Some of the contact ends electrically contact the decoupling components and electrically coupled to the ground plane of the mounting board.