Assertion: lung cancer | /r/HasProperty | difficult to treat
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Death rates are high because lung cancer is difficult to treat and usually is not detected until it has already spread.
text: Although lung cancer historically has been difficult to treat, advances in both treatment and symptom management help make this an exciting and hopeful time for patients.
text: The study team also hope to see why some lung cancers are difficult to treat.