After 44 days, Kendric Cromer, 12, left the hospital. While his family feels fortunate that he was the first to receive a treatment, their difficult experiences hint at what others will be up against. After 44 days, Kendric Cromer, 12, left the hospital. While his family feels fortunate that he was the first to receive a treatment, their difficult experiences hint at what others will be up against. Sickle Cell Anemia, Genetic Engineering, Therapy and Rehabilitation, Chemotherapy, Bluebird Bio Inc, Children’s National Hospital (Washington, DC) NYT > Science