From various sources, including CNN:
The FDA has, this week, issued an alert regarding cancer drug Avastin. There has been an alleged link to the development of anemia in several patients.
According to the FDA, patients have reported that when Avastin was taken in combination with Sutent, another cancer drug, reported microangiopathic hemolytic anemia (a loss of red blood cells).
What is particularly important is that Avastin is not approved to be taken in combination with Sutent, a cancer drug manufactured by Pfizer.
Here's the link.