In this task, you are given an abstract of article. Your task is to generate title for this article. Preferred titles are under thirty words.
Q: Cells undergo a variety of biological responses when placed in hypoxic conditions, including activation of signalling pathways that regulate proliferation, angiogenesis and death. Cancer cells have adapted these pathways, allowing tumours to survive and even grow under hypoxic conditions, and tumour hypoxia is associated with poor prognosis and resistance to radiation therapy. Many elements of the hypoxia-response pathway are therefore good candidates for therapeutic targeting.
A:
Hypoxia a key regulatory factor in tumour growth