TABLE 1.

United States National Cancer Database (NCDB) selection criteria

Criteria	Description
Primary site codes	C51.0, C51.1, C51.2, C51.8, C51.9
Histology	8000–8246, 8248–8576, 8940–8950, 8980–8981
Months survived	If greater or equal to 0 and not missing months survived
Diagnosis years	2010–2017
Class of case	Analytic cases
Age at diagnosis	18+ years
Sequence number	First or only cancer diagnosis
Clinical stage group	Clinical stage group analysis only, unknown clinical stage group was excluded
Pathologic stage group	Pathologic stage group analysis only, unknown pathologic stage group was excluded