AstraZeneca's proposal to buy out Cambridge Antibody Technology Group(CAT) will be reviewed for any potential antitrust violations, the UK Office of Fair Trading (OFT) said.

AstraZeneca, which currently holds 19.2 percent of CAT, announced May 15 it intends to buy the company's remaining shares for slightly more than the equivalent of $1.07 billion. The OFT said in a statement to the London Stock Exchange it will first consider whether this transaction is considered a merger under the terms of British law.

If so, the OFT will determine whether that arrangement would "result in a substantial lessening of competition within any market or markets in the United Kingdom for goods or services that warrant reference to the Competition Commission for investigation."