Fused pyrimidine compound or salt thereof

A method for treating a malignant tumor, comprising administering an effective amount of a compound represented by Formula (I) below or a salt thereof to a mammal in need thereof:

• wherein A is pyrazolyl substituted with n-number of R′;
• R1 is
• halogen,
• cyano,
• substituted or unsubstituted C1-C6 alkyl,
• substituted or unsubstituted C3-C7 cycloalkyl,
• substituted or unsubstituted C6-C14 aromatic hydrocarbon, or
• a substituted or unsubstituted C3-C10 monocyclic or polycyclic saturated or unsaturated heterocyclic group containing 1 to 3 identical or different heteroatoms selected from nitrogen, oxygen, and sulfur;
• R2 is
• substituted or unsubstituted C1-C10 alkyl,
• substituted or unsubstituted C3-C7 cycloalkyl,
• substituted or unsubstituted C2-C6 alkenyl,
• substituted or unsubstituted C3-C7 cycloalkenyl,
• substituted or unsubstituted C4-C12 bridged cycloalkyl, substituted or unsubstituted C6-C14 aromatic hydrocarbon, or
• a substituted or unsubstituted C3-C10 monocyclic or polycyclic saturated or unsaturated heterocyclic group containing 1 to 3 identical or different heteroatoms selected from nitrogen, oxygen, and sulfur;
• X is N;
• and
• n is an integer of 0 to 3,
• wherein when n is 2 or 3, R1 may be identical or different from each other.