Paraneoplastic neurological syndrome and polyglandular autoimmune syndrome type 2 in a case of small cell lung cancer.

We report a female patient with small cell lung cancer (SCLC) and clinical findings consistent with polyglandular autoimmune syndrome type 2 (PGA2) and paraneoplastic neurological syndrome (PNS). To the best of our knowledge, this is the first reported case of SCLC associated with PGA2 and PNS. All of the autoantibodies detected before anticancer treatment decreased below the upper normal limits after serial treatment, and the patients clinical symptoms also improved. Cross reactivity of autoantibodies may have contributed to the complicated clinical picture of this patient. [ABSTRACT FROM AUTHOR]