In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.

Besides the tumour itself , the radiation fields may also include the draining lymph nodes if they are clinically or radiologically involved with tumor , or if there is thought to be a risk of subclinical malignant spread .
Besides the tumor itself , the target for the radiation may also include the lymph nodes that drain the area .