Book excerpt: A leading cancer specialist tells the powerful stories of 3 adult leukemia patients—shining new light on the hidden history of the disease and the drugs developed to treat it. “A look at leukemia patients’ fear, survival and grace while fighting the disease . . . a quiet chronicle of life with and beyond leukemia, and sometimes life’s end.” —The Washington Post When you are told that you have leukemia, your world stops. Your brain can’t function. You are asked to make decisions about treatment almost immediately, when you are not in your right mind. And yet you pull yourself together and start asking questions. Beside you is your doctor, whose job it is to solve the awful puzzle of bone marrow gone wrong. The two of you are in it together. In When Blood Breaks Down, Mikkael Sekeres, a leading cancer specialist, takes readers on the journey that patient and doctor travel together. Sekeres, who writes regularly for the “Well” section of The New York Times, tells the compelling stories of three people who receive diagnoses of adult leukemia within hours of each other: Joan, a 48-year-old surgical nurse, a caregiver who becomes a patient; David, a 68-year-old former factory worker who bows to his family’s wishes and pursues the most aggressive treatment; and Sarah, a 36-year-old pregnant woman who must decide whether to undergo chemotherapy and put her fetus at risk. We join the intimate conversations between Sekeres and his patients, and we watch as he teaches trainees. Along the way, Sekeres also explores leukemia in its different forms and the development of drugs to treat it—describing, among many other fascinating details, the invention of the bone marrow transplant (first performed experimentally on beagles) and a treatment that targets the genetics of leukemia. The lessons to be learned from leukemia, Sekeres shows, are not merely medical; they teach us about courage and grace and defying the odds.