BUZZ-Summit Therapeutics Plc: Shares rise in debut
** Biopharmaceutical company's U.S.-listed shares up 2.7 pct at $10.20
** Stock rises as much as 4.5 pct to $10.35, valuing company at $120.8 mln
** Offering of 3.45 American depository shares priced at $9.90 each
** IPO raised about $34.15 mln