so here is what their protocol states: Arm 1 participants will...

so here is what their protocol states: Arm 1 participants will undergo resection/biopsy of their tumor and placement of a Rickham catheter at the site of the resection/biopsy. Patients receive chlorotoxin (EQ)-CD28-CD3zeta-CD19t-expressing CAR T-lymphocytes NCI SYs via single delivery starting on day 0 for 3 weekly cycles over 28 days. Each treatment cycle begins with one CAR T cell infusion delivered intracranial intratumoral or intracavitary [ICT] and lasts for 1 week. Beginning 1 week after cycle 3, patients may continue with CAR T cell treatment per principal investigator and patient discretion. Treatment continues in the absence of disease progression or unacceptable toxicity.

so patients are dosed 3 times over a month and if the principal investigator says more could be given and with patient discretion then a 4th cycle will be completed. Patients can be dosed multiple times, but they cannot change dose I think.