Q: Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.
Question: Does tumor invasion of extralobar soft tissue beyond the hilar region affect the prognosis of surgically resected lung cancer patients?
Answer: Tumor invasion of the soft tissue beyond hilar region would not be a prognostic factor in patients who have undergone curative resection for primary lung cancer, although investigation of larger number of cases will be needed to confirm the validity of our conclusion.
A:
no