Last week, the FDA said it had received reports of six new cases of pancreatitis – including two deaths – associated with the diabetes drug Byetta. Today, Amylin and Eli Lilly said that they had reported four additional deaths to the agency as well, which the FDA hasn’t yet made public.

The companies, which co-market the drug, chose to disclose the additional information in order to “provide context” about each of the cases, because the medical community appeared confused by the information last week, Amylin President and Chief Executive Daniel Bradbury told the Health Blog.

Another reason might be to reassure investors. Byetta, co-marketed by the companies, already has a label reflecting its association with severe inflammation of the pancreas. But the FDA says it’s working on a stronger label for the drug that includes forms of pancreatitis that involve bleeding and cell death. Both companies’ stock dipped following the news last week, though Amylin’s was particularly hard hit, plunging as much as 22% since the FDA announcement before recovering somewhat.

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