gfp: We were told a genetic predisposition. Nothing is ever 100% caused by any one thing. The myriad of factors that are in play are beyond our minds to comprehend. I just know that her CBC has been a subject of scrutiny for the last 20 years, and her last 3 show a slight trend in the wrong direction. Her Doctor is being vigilant and keeping my wife in the loop. And her internist has consulted an Austin hematologist/oncologist who did his Residency at MD Anderson in Houston. She is in good hands here. That would probably not be the case in Mexico.