Abstract: [Problem] Provided is a compound which is useful as an active ingredient of a pharmaceutical composition for treating lung cancer. [Means for Solution] The present inventors have studied a compound useful as an active ingredient of a pharmaceutical composition for treating lung cancer, and as a result, it was found that a quinazoline compound has an excellent G12C mutation KRAS inhibitory activity, and which can be used as a therapeutic agent for lung cancer, and thereby the present invention has been completed. The quinazoline compound of the present invention and a salt thereof may be used as the therapeutic agent for lung cancer.

Abstract: [Problem] Provided is a compound which is useful as an active ingredient of a pharmaceutical composition for treating lung cancer. [Means for Solution] The present inventors have studied a compound useful as an active ingredient of a pharmaceutical composition for treating lung cancer, and as a result, it was found that a quinazoline compound has an excellent G12C mutation KRAS inhibitory activity, and which can be used as a therapeutic agent for lung cancer, and thereby the present invention has been completed. The quinazoline compound of the present invention and a salt thereof may be used as the therapeutic agent for lung cancer.

Abstract: [Problem] Provided is a compound which is useful as an active ingredient of a pharmaceutical composition for treating lung cancer. [Means for Solution] The present inventors have studied a compound useful as an active ingredient of a pharmaceutical composition for treating lung cancer, and as a result, it was found that a quinazoline compound has an excellent G12C mutation KRAS inhibitory activity, and which can be used as a therapeutic agent for lung cancer, and thereby the present invention has been completed. The quinazoline compound of the present invention and a salt thereof may be used as the therapeutic agent for lung cancer.

Abstract: [Problem] Provided is a compound which is useful as an active ingredient of a pharmaceutical composition for treating lung cancer. [Means for Solution] The present inventors have studied a compound useful as an active ingredient of a pharmaceutical composition for treating lung cancer, and as a result, it was found that a quinazoline compound has an excellent G12C mutation KRAS inhibitory activity, and which can be used as a therapeutic agent for lung cancer, and thereby the present invention has been completed. The quinazoline compound of the present invention and a salt thereof may be used as the therapeutic agent for lung cancer.

Abstract: Compounds of formula (I) and salts thereof: wherein the variables are defined herein, are useful for the treatment of breast cancer.

Abstract: [Problem] A compound which is useful as an agent for treating breast cancer is provided. [Means for Solution] As a result of intensive studies on a compound having a Complex I inhibitory effect and an AMPK activation effect, the present inventors found that a bicyclic nitrogen-containing aromatic heterocyclic amide compounds of the present invention has an excellent Complex I inhibitory effect and the AMPK activation effect, furthermore, has a cell proliferation inhibitory effect with respect to not only human PIK3CA mutation-positive breast cancer cell lines in which MCT4 is not expressed but also human breast cancer cell lines which do not have mutation of PIK3CA in which MCT4 is not expressed, and exhibits an anti-tumor effect in a human PIK3CA mutation-positive breast cancer cell line MDA-MB-453 cell in a cancer-bearing mouse in which the MCT4 is not expressed, thereby completing the present invention.

Abstract: A substituted amide compound is useful as an active ingredient of a pharmaceutical composition, in particular a pharmaceutical composition for treating diseases caused by lysophosphatidic acid (LPA). The compound is of a formula: In this formula, A is an optionally substituted aryl, etc.; B is an optionally substituted 5-membered aromatic hetero ring group; X is a single bond or —(CRX1RX2)n—; n is 1, 2, 3, or 4; RX1 and RX2 are hydrogen, etc.; Y1 to Y5 are each CRY or N; each RY is hydrogen, etc.; R1 and R2 are hydrogen, etc.; m is 1, 2, or 3; R3 is hydrogen, etc.; and R4 is an optically substituted lower alkyl, etc.

Abstract: A substituted amide compound is useful as an active ingredient of a pharmaceutical composition, in particular a pharmaceutical composition for treating diseases caused by lysophosphatidic acid (LPA). The compound is of a formula: In this formula, A is an optionally substituted aryl, etc.; B is an optionally substituted 5-membered aromatic hetero ring group; X is a single bond or —(CRX1RX2)n—; n is 1, 2, 3, or 4; RX1 and RX2 are hydrogen, etc.; Y1 to Y5 are each CRY or N; each RY is hydrogen, etc.; R1 and R2 are hydrogen, etc.; m is 1, 2, or 3; R3 is hydrogen, etc.; and R4 is an optionally substituted lower alkyl, etc.

Abstract: A substituted amide compound is useful as an active ingredient of a pharmaceutical composition, in particular a pharmaceutical composition for treating diseases caused by lysophosphatidic acid (LPA). The compound is of a formula: In this formula, A is an optionally substituted aryl, etc.; B is an optionally substituted 5-membered aromatic hetero ring group; X is a single bond or —(CRX1RX2)n—; n is 1, 2, 3, or 4; RX1 and RX2 are hydrogen, etc.; Y1 to Y5 are each CRY or N; each RY is hydrogen, etc.; R1 and R2 are hydrogen, etc.; m is 1, 2, or 3; R3 is hydrogen, etc.; and R4 is an optically substituted lower alkyl, etc.

Abstract: A substituted amide compound is useful as an active ingredient of a pharmaceutical composition, in particular a pharmaceutical composition for treating diseases caused by lysophosphatidic acid (LPA). The compound is of a formula: In this formula, A is an optionally substituted aryl, etc.; B is an optionally substituted 5-membered aromatic hetero ring group; X is a single bond or —(CRX1RX2)n—; n is 1, 2, 3, or 4; RX1 and RX2 are hydrogen, etc.; Y1 to Y5 are each CRY or N; each RY is hydrogen, etc.; R1 and R2 are hydrogen, etc.; m is 1, 2, or 3; R3 is hydrogen, etc.; and R4 is an optionally substituted lower alkyl, etc.

Abstract: [Problem] The present invention has an object to provide a compound having a GPR40 agonistic activity, which is useful as a pharmaceutical composition, an insulin secretion promoter, or an agent for preventing/treating diabetes. [Means for Solution] The present inventors have extensively studied a compound having a GPR40 agonistic activity, and as a result, they have found that the compound (I) of the present invention or a pharmaceutically acceptable salt thereof, in which a carboxylic acid is bonded to a bicyclic or tricyclic moiety through methylene, and further, a benzene ring substituted with a monocyclic 6-membered aromatic ring is bonded to a bicyclic or tricyclic moiety through —O-methylene or —NH-methylene, has an excellent GPR40 agonistic activity. They have also found that the compound has an excellent insulin secretion promoting action and strongly inhibits increase in the blood glucose after glucose loading, thereby completing the present invention.

Abstract: A pharmaceutical agent having GPR40 receptor agonistic action, particularly a compound which is useful as an insulin secretagogue or an agent for preventing and/or treating diabetes mellitus. The present inventors have examined a compound having GPR40 receptor agonistic action, confirmed that an oxadiazolidinedione compound which has a substituent such as a benzyl group, etc. linked with a substituent such as a phenyl group, etc. through a linker at the 2-position of an oxadiazolidinedione ring, or a pharmaceutically acceptable salt thereof has an excellent GPR40 agonistic activity, and thus completed the invention. The oxadiazolidinedione compound has excellent insulin secretagogue action and anti-hyperglycemic action, and therefore can be used as an insulin secretagogue or an agent for preventing and/or treating diabetes mellitus.