Elsewhere, French drugmaker Sanofi (NasdaqGM: GCVRZ - news ) advanced as it said it has entered into a research agreement with Regeneron Pharmaceuticals (NasdaqGS: REGN - news ) and will invest $2.17bn to develop new cancer treatments together.
Take context from the input text and decide on the accurate relationship between 'Sanofi' and 'Regeneron Pharmaceuticals' from the options provided.
Options: legal form, creator, developer, owner of