** Shares of Ambrx Biopharma AMAM.O more than double at
$27.5 in premarket trading
** Johnson & Johnson JNJ.N said it had agreed to buy drug
developer AMAM for $2 bln to gain access to its targeted cancer
therapies
** J&J will pay $28 per share for Ambrx, which represents a
premium of about 105% to the stock's last close
** Ambrx is developing therapies that belong to the class of
drugs called antibody-drug conjugates, which researchers
describe as "guided missiles" to target cancer cells and
minimize damage to healthy tissues
** J&J's acquisition is the latest deal announced in the
space
** In November, AbbVie ABBV.N said it would buy
ADC-developer ImmunoGen IMGN.O for $10.1 bln in cash
** AMAM stock were up six-fold in 2023
(Reporting by Pratik Jain in Bengaluru)
((Pratik.Jain@thomsonreuters.com;))