PFA-2c ependymomas compared with other PFA-2 ependymoma subtypes and all other PFA subtypes with respect to flag variable 1a
| Flag Variable 1b | Yes | No |
|---|---|---|
| PFA-2c | 5 (100%) | 0 (0%) |
| PFA-2a and PFA-2b | 3 (9%) | 30 (91%) |
| All other PFA tumors | 6 (5.6%) | 102 (94.4%) |
↵a Ninety-eight subjects had subtype data available. “All other PFA tumors” includes the PFA-1 subgroup and the PFA-2a and 2b subtypes. The 15 subjects with PFA-1 subgroup ependymomas that could not be subtyped were included in the category of All other PFA tumors. The 9 patients with PFA-2 tumors that could not be subtyped were not included in this analysis.
↵b The flag variable incorporates the following 3 variables: “no” for extension below the foramen magnum, “no” for encases blood vessels, and “midfloor-type” tumor.