Jennifer Rein, PNP Nurse Practitioner, Cancer and Blood Disorders Center Image Phone 617-355-7476 Print Profile Request an Appointment Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Listen Jennifer Rein, PNP Nurse Practitioner, Cancer and Blood Disorders Center Medical Services Programs & Services Cancer and Blood Disorders Center Languages English Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115