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Thank you for your question.
How have his blood glucose levels been?
Were the glucose levels well controlled or not?
Do you know if he has has any hormonal tests like tests to check cortisol and thyroid?
Thank you for your response.
I think that there still are chances, considering his severe weight loss, that he could be having a hidden cancer or malignancy.
I would recommend having a test called as PET scan done.
Has he had that done as yet?
This test is much superior to the scans that he has already had done and will definitively rule out cancer and I would recommend having that done if that has not been done already.