STICk-IM NSCLC (Non-Small Cell Lung Cancer with Brain Metastases)

If you choose to join this study, you will:
- Be randomized (like flipping a coin) into Group 1 or Group 2:
-- Group 1 will go as follows:
--- Have stereotactic radiation therapy (SRS) right away in up to 5 doses
--- Receive immunotherapy later after the SRS
-- Group 2 will go as follows:
---- Receive immunotherapy right away
---- Receive SRS later, but only if your cancer progresses

All study participants will:
- Answer questionnaires
- Have neurocognitive tests
- Have blood draws

Your participation will last for about 1 year. You may be asked to come for one more visit between year 1 and year 2, but only if your cancer progresses.