Initial management of newly diagnosed WHO grade 2-3 adult meningioma following surgery: results from the Dutch Brain Tumour Registry (2016-2021).

Although the OS curves of patients with a WHO 3 grade meningioma appeared to diverge from one another, this did not reach statistical significance ( p = 0.08; Fig. 3 C): for patients who received adjuvant RT, OS after 5 years was 46.5% (95%-CI: 22.5–67.5%), while this was 24.0% (95%-CI: 3.8–53.7%) for those who did not receive adjuvant RT.

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