** Shares of cancer biotech Arcellex Inc ACLX.O start
trade 20.7% higher at $26.16, their highest open since co's
debut 10 months ago
** Arcellex partners with Gilead Sciences Inc GILD.O
business Kite to co-develop and co-commercialize CART-ddBCMA,
Arcellex's lead product candidate for cancer immunotherapy
currently in mid-stage trials urn:newsml:reuters.com:*:nPn6L6KbVa
** Immunotherapy is a type of cancer treatment that trains a
patient's immune cells to fight tumors
** ACLX will receive upfront cash payment of $225 mln and
$100 mln equity investment; both cos will share costs of
development, trials and commercialization, while Kite will bear
manufacturing costs
** Both cos will split U.S. profits from treatment equally;
outside the United States, Kite will commercialize treatment and
ACLX will receive low- to mid-teen royalties on sales
** Deal expected to close in Q1 2023
** ACLX also enters stock purchase agreement with GILD
** GILD to buy 3.48 mln ACLX shares for $100 mln
** Separately, ACLX also announces positive preliminary data
from an early-stage expansion trial of the treatment
urn:newsml:reuters.com:*:nPn4w6Ny8a
(Reporting by Ruhi Soni in Bengaluru;)
((Ruhi.Soni@thomsonreuters.com
Twitter: https://twitter.com/ruhithere))