Physiologically active PEG-IFNa conjugates having a formula as ows: 0 124 GRENZACHERSTRASSE, CH-4070 BASLE(SWITSERLAND), A SWISS COMPANY, SWITZERLAND F.HOFFMANN-LA ROCHE AG 1032/MAS/1997 1032/MAS/1997 INDIA 2009-03-25T18:04:40Z 2005-04-15 1997-05-15 415300 A61 K 47/48 1) PASCAL SEBASTIAN BAILON 2) ALICIA VALLEJO PALLERONI. -2 0 1110 US 1996-05-31 60-018,834 2005-04-15 0 3fWYvQGs 2009-04-30T18:55:33Z 131903 1) PASCAL SEBASTIAN BAILON 2) ALICIA VALLEJO PALLERONI 5391 F.HOFFMANN-LA ROCHE AG