CD40LG and rheumatoid arthritis: RA patients that are classified as Heat by the Chinese medicine expert are characterized with higher optimal quantifications on average on the symptoms ‘red joints’, ‘swollen joints’, ‘warm feeling’, ‘warm joints’, ‘dull pain’ and ‘pain that worsens with warmth and movement’, and with higher levels of the optimally scaled clinical parameters mean corpuscular hemoglobin concentration (MCHC), IgG, lymphocyte number (LY#), IgM, platelet count (PLT) and cholesterol.