Developer Carter Winstanley said he’s confident Alexion Pharmaceuticals won’t abandon plans to move its headquarters into his new $100 million building at 100 College St., despite reports that the company may be acquired by a larger pharmaceutical firm.

If it ever did abandon plans, he’d continue with the building and find a new tenant, he said.

Winstanley made the remarks Monday following news reports that Roche Holding AG, the world’s largest producer of cancer drugs, may buy Alexion.

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