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.
Refer to the input text as context and select the correct relationship between 'Sanofi' and 'Regeneron Pharmaceuticals' from the available options.
Options: creator, legal form, owner of, developer