Less than a week after his own surgery for heart trouble, Bernie Sanders and his family are mourning the loss of his daughter-in-law, Dr. Rainè Riggs, just two days after she was diagnosed with cancer.  

Riggs, who's married to Sanders' son Levi and is a mother of three, died on October 5 at age 46. According to her obituary, her illness was swift and left doctors confused. "Rainè became ill three weeks ago. The hospitals were stumped,” the obituary reads. “We brought her home last Sunday to UPMC [University of Pittsburgh Medical Center], where she was diagnosed with neuroendocrine cancer. She died two days later."

The quick progression of Riggs's cancer is tragic and alarming. Here's what you need to know about neuroendocrine cancer.

RELATED: What is Cancer? 

What is neuroendocrine cancer?

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