When utilizing the Canadian Regimen of 4256cgy/16 fxn- what boost dose and fractionation are you using?   

We typically use the START B regimen when boosting (267cGy x 15 fractions) + 200cGy x 5 for the boost.When not boosting, we use Canadian regimen (266cG7 x16 fractions = 4256cGy).

We use 2.5 Gy x 4 after 42.5 Gy in 16 fractions for a total of 20 fractions.

According to the most recent ASTRO 2018 whole breast guidelines published in PRO, in the absence of strong risk factors for local recurrences, 1000 cGy in 4 to 5 fractions is suggested as the standard tumor bed boost dose-fractionation, regardless of whole breast dose-fractionation, stage, or histol...

I have been boosting 2Gyx5 without changing the number of fractions from 16.  I am considering changing to 2.5x4 as well.

I use 2.66 Gy x 4 when I boost these patients (which is pretty much the same as 2.5 Gy x 4). I prefer this dose because it is close to the BED of standard fractionation of 50 Gy + 12 Gy boost. It largely dealer's choice. Our boost plans rarely have siginficant heterogeneity. In my mind it is r...