The 31-year-old will undergo surgery next week and is not expected to play again for several months, reports Xinhua news agency.
"I am upset, but also confident about the days ahead," the former Lazio player told a news conference on Tuesday.
"It will be another battle and I have won a few in my life. I am sure that I will win this one, too, to play football as soon as possible," he added.
Flamengo doctor Marcio Tannure said the illness was detected after failed doping tests, in which the substance beta-HCG, which stimulates the production of testosterone, was discovered in Ederson's urine samples.
Tannure added that Ederson, who earned a solitary Brazil cap in 2010, had a 99 per cent chance of making a full recovery.
Flamengo President Eduardo Bandeira de Mello said Ederson would have the unconditional support of the club.
"When we had the first news of the anti-doping, we kept our full confidence in him, he is an example of an athlete," de Mello said.
"The cancer was detected after blood and image exams."
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.