Tests for thyroid antibodies, rheumatoid factors, antinuclear antibodies, antidouble-stranded DNA, anti-SSA, anti-SSB, anti-Jo-1, anti-Scl-70, anti-PM-Scl, anti-SM/RNP, anti-cardiolipin IgM-IgG, anti-phosphatidylserine IgM-IgG, p-ANCA/MPO, and c-ANCA/PR3 were also negative. Here, CD40LG is linked to thyroiditis.