How many PTVs and what doses do you utilize for a cT3N0M0 squamous cell carcinoma of the larynx receiving definitive concurrent chemoradiation?  

I typically think of 2 targets -  a clinical target and a subclinical target.  Whether one wants to divide the subclinical target into 2 targets -  an intermediate and lower risk target is an option, but whether it is an absolute is a matter for debate. Traditional treatment was larg...