A newly surfaced CIA document suggests US intelligence once reviewed research that hinted at a possible cancer treatment more than 60 years ago. The document, produced in February 1951 and declassified in 2014, summarizes a Soviet scientific paper that examined striking similarities between parasitic worms and cancerous tumors. snip Although the document was declassified more than a decade ago, it has recently resurfaced online, fueling outrage among some Americans who say it raises troubling questions about why Cold War research hinting at possible cancer treatments sat in intelligence archives for decades.