A method of diagnosing or monitoring a condition of interest in a subject includes comparing thermograms generated using differential scanning calorimetery. A signature thermogram contains a protein composition pattern for a sample obtained from the subject. The signature thermogram is compared to a standard thermogram. Standard thermograms can include a negative standard thermogram containing a protein composition pattern associated with an absence of the condition of interest, and a positive standard thermogram containing a protein composition pattern associated with a presence of the condition of interest.