Merged summary stage

Source of standard: CDC’s National Program of Cancer Registries

Source item name: Combined from Derived SS2000 and SEER Summary Stage 2000

Source item numbers: Derived from NAACCR 3020external icon (Derived SS2000), 759external icon (SEER Summary Stage 2000), and 764external icon (Summary Stage 2018)

This is a merged stage variable created using the variables SEER Summary Stage 2000, Derived SS2000, and Summary Stage 2018. This stage variable can be used for diagnosis years 2001–2018.

Considerations for Use

This variable is not available for testis, leukemia, or myeloma cases.

The coding logic for this merged variable is—

  • For NPCR-registries—
    • If a case was diagnosed in 2001, 2002, 2003, 2016 or 2017, stage at diagnosis is recorded using the SEER Summary Stage 2000 variable value.
    • If a case was diagnosed in or between 2004 and 2015, stage at diagnosis is recorded using the Derived SEER Summary Stage 2000 variable value. If the Derived SEER Summary Stage 2000 variable is blank or unstaged, and the SEER Summary Stage 2000 variable has a valid value, that value is used to populate the merged variable.
    • If a case was diagnosed in 2018, stage at diagnosis is recorded using the Summary Stage 2018 variable value.
  • For SEER-only registries (Connecticut, Hawaii, Iowa, and New Mexico)—
    • If a case was diagnosed in 2001, 2002, or 2003, stage at diagnosis is recorded using the SEER Summary Stage 2000 variable value.
    • If a case was diagnosed in or between 2004 and 2015, stage at diagnosis is recorded using the Derived SEER Summary Stage 2000 variable value.
    • If a case was diagnosed in 2016 or 2017, the best available value from either Derived SEER Summary Stage 2000 or SEER Summary Stage 2000 is used.
    • If a case was diagnosed in 2018, stage at diagnosis is recorded using the Summary Stage 2018 variable value.

Note: This frequency table does not include testis, leukemia, or myeloma cases.

data/merged-stage-us.json
data/merged-stage-uspr.json