If using GCSF with mFOLFIRINOX, would you ever use it during day 1?

Assuming you are talking about a pegylated GCSF product, we give it on day 4 of this regimen (the day after 5-FU pump ends). We have no problems with reimbursement for that (places the drug 11 days prior to the next dose). I would not be comfortable with a day 1 delivery.