Role of CTV expansion in H & N and Lung primary

Anyone routinely skipping CTV expansions off the GTV (that are taken to the gross disease dose) in the following situations:

1) H&N definitive RT/ChemoRT, omitting a 70Gy 'CTV' expansion of 3-5mm for the primary, in say a Oropharynx patient
2) Same as #1, but for a positive lymph node
3) Definitive chemoRT for lung cancer (NSCLC, LS-SCLC), in regards to the primary
4) Same as #3, but for positive lymph nodes

Source: Student Doctor Network - January 4, 2021 Category: Universities & Medical Training Authors: evilbooyaa Tags: Radiation Oncology Source Type: forums