Combined use of antitumor indolopyrrolocarbazole derivatives and other antitumor agent

A combination of pharmaceutical preparations, which are simultaneously, separately, or successively administered in treatments for cancers. It comprises the following two separate preparations: * a pharmaceutical preparation comprising a pharmaceutically acceptable support or diluent and either at least one compound represented by the general formula [I]: [I] (wherein R1 and R2 each independently represents hydrogen, (I) lower alkyl, etc.; G represents a pentose group, etc.; and X1 and X2 each independently represents hydrogen, halogeno, etc.) or a pharmaceutically acceptable salt of the compound and * a pharmaceutical preparation comprising a pharmaceutically acceptable support or diluent and any of an anticancer alkylating agent, anticancer antimetabilite, anticancer antibiotic, plant-derived anticancer agent, and the like (the pharmaceutical preparation containing at least one compound represented by the above formula [I] or a pharmaceutically acceptable salt thereof may be used in combination ...