| CPC C07K 14/7051 (2013.01) [A61K 40/11 (2025.01); A61K 40/31 (2025.01); A61K 40/4202 (2025.01); A61P 35/00 (2018.01); C07K 16/2896 (2013.01); C12N 5/0638 (2013.01)] | 18 Claims |

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1. A method of treating small cell lung cancer (SCLC) in a subject that has been diagnosed with limited stage SCLC, the method comprising administering to the subject a chemotherapy regimen or an immunotherapy regimen to the subject, wherein the subject has been diagnosed with limited stage SCLC by:
(a) contacting a biological sample obtained from the subject with an array consisting essentially of antigens capable of specifically binding, respectively, to four autoantibodies, wherein the four autoantibodies are anti-GAD65 antibodies, anti-PTPRU antibodies, anti-TFRC antibodies, and anti-GABA-b antibodies;
(b) detecting an amount of the four autoantibodies present in the biological sample when the autoantibodies bind to the antigens in the array; and
(c) diagnosing limited stage SCLC in the subject when the amount of the four autoantibodies in the biological sample exceeds, respectively, a control amount.
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