Oncology is the medical subspecialty dealing with the study and treatment of cancer. A physician who practices oncology is an oncologist. The term originates from the Greek onkos (ονκος), meaning bulk, mass, or tumor and the suffix -ology, meaning "study of."
Oncologists may be divided on the basis of the type of treatment provided.
Oncologists may also be categorized on the basis of the patient type.

American Society of Pediatric Hematology/Oncology - Professional group that studies and treats childhood cancer and blood diseases.
Meta Description: [ American Society of Pediatric Hematology/Oncology ]
Association of Pediatric Oncology Social Workers - Committed to enhancing the emotional and physical well-being of children with cancer and their families.
Mayo Clinic: Division of Pediatric Hematology and Oncology - Overview of the clinic, patient stories, diseases, treatment, services, and contact information. [Rochester, Minn]
Meta Description: [ Division of Pediatric Hematology and Oncology at Mayo Clinic in Rochester, Minn. ]
NCI-CCR: Pediatric Oncology Branch - Provides patients, families and physicians with an overview of the type of treatments available for children with cancer and current research being conducted. [Bethesda, Maryland]
ology/Oncology - Uses the team approach to treat children with cancer and blood disorders. Includes staff, services, stem cell information, and resources. [PA]
Meta Description: [ The Division of Pediatric Hematology/Oncology at Penn State Children's Hospital
provides World Class Care to infants, children, adolescents and young adults
with two very distinct groups of disorders. Those with blood disorders and
those with a wide variety of cancers. ]
Oxford Journals: Principles and Practice of Pediatric Oncology - Discussion of the collaborative approach to reduce childhood cancer and improve the quality of life of children during and after treatment.
University of Rochester Medical Center: Pediatric Hematology/Oncology - Description of the group's activities, professional biographies of the health-care providers, and links to information on clinical services and the fellowship program.[New York]
Meta Description: [ The Department of Pediatrics' Division of Hematology/Oncology at Strong Memorial Hospital, the University of Rochester Medical Center. The division provides full services for all children with hematologic or oncologic disease within the surrounding 11-county area, and the unit is the sole provide... ]