How would treat a patient with good performance status with PTCL-NOS found to have leptomeningeal disease during treatment course with CHOEP?

I haven’t combined CHOEP with high dose methotrexate before! I have treated a patient with HIV-associated B-cell lymphoma with R-EPOCH and high dose methotrexate at D15 successfully with growth factor support. For patients with PTCL-NOS and leptomeningeal involvement at presentation, I would likely ...