important. i think that not just for melanoma but other types overcancers as well, cancer comes in sometimes and disables the immune system. this turns it back on. >> good cancer news good for everybody. thanks very much dr. sanjay gupta. i'm jim sciutto in today for jake tapper. i turn you over now to the capable hands of wolf blitzer. he is as always in "the situation room." happening now, breaking news. for quite some time the fbi says terrorists behind the san bernardino attacks were radicalized long before the massacre. now investigators are focusing in on the couple's overseas trips. who did they see and what was their connection to other countries? target practice, the killers now known to have visited multiple shooting ranges in southern california, even as they were stockpiling ammunition and explosives. how do they practice for their attack unnoticed? secret life. new details of the female terrorist who pledged allegiance to isis, where she grew up and