The FDA can approve an NDA based on "one adequate and well-controlled clinical investigation plus confirmatory evidence." FDAMA 1997.
In December 2019 the FDA in draft guidance clarified this as "one adequate and well-controlled large multicenter trial that can provide substantial evidence of effectiveness."
Are getting brain bleeds and/or getting swollen brains "tolerable" in a safety profile. According to your statement for approval, they are 'tolerable'.