¿ International Biotechnology Trust plc (IBT), of London, which invests in mid-stage companies, received a much needed boost from the sale of Sugen Inc., of South San Francisco, to Pharmacia & Upjohn, of Bridgewater, N.J. The deal values IBT¿s holding in Sugen at $22.8 million. IBT invested $3.8 million between October 1994 and September 1995, and a further $3.6 million in October 1996.