In 2007, Sanofi-Aventis expanded on Aventis' prior relationship with Regeneron Pharmaceuticals; in the new deal Sanofi-Aventis agreed to pay Regeneron $100 million each year for five years, under which Regeneron would use its monoclonal antibody discovery platform to create new biopharmaceuticals, which Sanofi-Aventis gained the exclusive right to co-develop. In 2009, the companies expanded the deal to $160 million per year and extended it through 2017. , the collaboration had four antibodies in clinical development and had filed an IND for a fifth. Two were against undisclosed targets, one targeted the interleukin-6 receptor as a treatment for rheumatoid arthritis, another targeted nerve growth factor for the treatment of pain, and another targeted delta-like ligand 4 as a treatment of cancer.