Do you apply a tracheal dose constraint during thoracic radiation and/or reirradiation?  

I have used Dmax BED3 < 140 Gy for initial treatment (based off experience with 60 Gy in 15 fractions considered a conservative choice for ultra-central tumors). It was noted that below Dmax BED3 140 Gy there was no high grade toxicity per Chen et al., PMID 31075543. Also, see Lodeweges et al., P...