So you've just received an international search report on your PCT application and the searching authority has stated that all the claims are lacking in novelty. Well, all's not lost, there are opportunities for making amendments to an international patent application. It's possible to make an amendment, to the claims only, under Article 19 of the Patent Cooperation Treaty prior to the publication of the international patent application. It's also possible to lodge amendments to the claims, description and drawings with a Demand for International Preliminary Examination. In either case your amendments must be supported by material in the international patent application as originally filed.