** U.S.-listed shares of China-based biopharma co GRCL.O
up ~20% at $10.80 premarket
** U.S. FDA grants Orphan Drug designation to co's lead
product candidate, GC012F, for treating multiple myeloma, a type
of cancer that forms in plasma cells urn:newsml:reuters.com:*:nPn29WPTfa
** The designation is given to a drug or biological product
to prevent, diagnose or treat a rare disease or condition
** GC012F is a CAR-T cell therapy, a treatment in which a
type of immune system cell of the patient is changed in the
laboratory so they attack cancer cells
** GC012F is currently being evaluated in an early-stage
trial across multiple centers in China
** Up to Thursday's close, stock had fallen 64.17% since its
Jan. 8 debut
(Reporting by Oishee Majumdar in Bengaluru)
((oishee.majumdar@thomsonreuters.com;))