@bceg1969 , GAC is short for the 3-drug chemo combo of Gemcitabine + Abraxane + Cisplatin

Of the two longstanding chemo "Standard of Care" (SoC) regimens, Folfirinox is one, and Gemcitabine (aka Gemzar) is the common base of the other.

Gemcitabine is usually combined with one or the other (Gem more often than Cis, I believe) but sometimes both.

Cisplatin is "believed" to help patients with an ATM mutation.