rTX

A retreatment classification, rTX, is appropriate if, following radiotherapy, radiation pneumonitis precludes adequate evaluation and evidence of residual tumor in the chest is obscured.

Fig. 2: Posterior-anterior chest radiograph. Well established changes of radiation pneumonitis are present in the right 5 months after completion of therapy, rTX.

T0

A clinical classification of T0 is assigned if lung cancer is proved, but there is no evidence of the tumor in the lungs. Examples are lung cancers that present as metastatic disease or as another primary site, but are subsequently confirmed to be metastasis from lung cancer. A retreatment classification of rT0 is appropriate for lung cancer that is in complete remission or that has been completely resected and has recurred elsewhere. In multistep treatment programs randomization to the 2nd or n phase of therapy may be assigned on the basis of the retreatment classification.