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China-based Antengene Corporation Ltd (HKG: 6996) has unveiled a transfer agreement with US-headquartered Calithera Biosciences Inc. (OTCMKTS: CALA), expanding on an earlier license agreement. Under the new agreement, Antengene will acquire all remaining rights to CB-708 (ATG-037), Calithera’s small-molecule CD73 inhibitor. This move underscores Antengene’s commitment to advancing innovative cancer…