What is the percent ratio of cancer returning from taing letrozole to stopping. was stage 3 mass size just short of 8.double masc.nodes rremoved no cancer cells there.massive chemo,radiation,double masc even tho was only in left,not metestized. side effects of 1 and half yrs of letrozole r horrible,short of breath,hurt all over,severe fatique,extreme vag.dryness and pain. u name it i have it.stopped taking it a wk ago,dr says we will reacess in 2 wks when i have phuebotomy for extreme high iron.im tired and want a lil bit of my life back.