The Nikkei average finished marginally lower at 40,654.70 ahead of the Bank of Japan's interest-rate decision on Thursday, with no change in interest rates expected. The broader Topix index settled 0.40 percent higher at 2,920.18.
ANA Holdings tumbled 4.1 percent and Advantest dropped 1.1 percent after announcing their earnings results while Sumitomo Pharma surged 16.3 percent after a rating upgrade by JPMorgan.
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