Five months pregnant and diagnosed with cancer - what to do?

I attend class with a woman who just found out her pregnant sister was diagnosed with cancer (cervical or uterine, I’m not sure which). If you were the woman in question, what would you do? If you were a friend or family member, would you express your opinion on what you think she should do? What about her husband – does he have a say? He may lose his wife, child or both.