Thermo Fisher Scientific for chromogranin A reagents and supplies to perform this study and Drs. Ferraro and Panteghini on advice regarding matrix and the BRAHMS CgA II KRYPTOR test.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: Thermo Fisher Scientific.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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