Monoclonal antibody and use thereof

A monoclonal antibody or a fragment thereof, which is one of the following (i) to (iii):

• (i) a monoclonal antibody or a fragment thereof in which heavy-chain complementarity-determining regions (CDRs) 1 to 3 respectively consist of amino acid sequences of SEQ ID NOs:
• 2 to 4 and light-chain CDRs 1 to 3 respectively consist of amino acid sequences of SEQ ID NOs:
• 5 to 7;
• (ii) a monoclonal antibody or a fragment thereof in which heavy-chain CDRs 1 to 3 respectively consist of amino acid sequences obtained by deleting, substituting, or adding one or several amino acids in the amino acid sequences of SEQ ID NOs:
• 2 to 4 and light-chain CDRs 1 to 3 respectively consist of amino acid sequences obtained by deleting, substituting, or adding one or several amino acids in the amino acid sequences of SEQ ID NOs:
• 5 to 7, and which has binding properties to a Kitakyushu lung cancer antigen-1 (KK-LC-1) protein;
• and
• (iii) a monoclonal antibody or a fragment thereof which competes with the monoclonal antibody or a fragment thereof in which the heavy-chain CDRs 1 to 3 respectively consist of the amino acid sequences of SEQ ID NOs:
• 2 to 4 and the light-chain CDRs 1 to 3 respectively consist of the amino acid sequences of SEQ ID NOs:
• 5 to 7, and has binding properties to the KK-LC-1 protein.