oncology

oncology. It is the branch of medicine dedicated to the study, diagnosis, treatment, and prevention of cancer. The field encompasses a wide range of disciplines, from molecular biology to palliative care, and involves collaboration among specialists like surgeons, radiation oncologists, and medical oncologists. Its development has been closely tied to advances in understanding carcinogenesis and the immune system.

Overview

The modern discipline coalesced in the 20th century with foundational work by individuals like Sidney Farber, considered the father of modern chemotherapy. Major institutions driving progress include the National Cancer Institute in the United States and the International Agency for Research on Cancer. The field's scope extends from basic science conducted at laboratories like the Cold Spring Harbor Laboratory to clinical care delivered in comprehensive centers such as the MD Anderson Cancer Center and the Memorial Sloan Kettering Cancer Center.

Subspecialties

Oncology is divided into several focused areas. Medical oncology involves systemic drug therapies, while radiation oncology employs ionizing radiation often using technologies like linear accelerators. Surgical oncology is performed by specialists trained in procedures ranging from lumpectomy to Whipple procedures. Other subspecialties include gynecologic oncology, led by figures like John H. Shepherd, pediatric oncology, and hematologic oncology, which focuses on cancers like leukemia and lymphoma. Multidisciplinary care is coordinated through tumor boards.

Diagnosis

Accurate diagnosis relies on histopathology from a biopsy, often guided by medical imaging such as computed tomography or magnetic resonance imaging. Pathologists examine tissue samples, sometimes using stains developed by George Papanicolaou. Molecular diagnostics, including tests for specific mutations like those in the BRCA1 gene, are increasingly critical. Staging follows systems like the TNM staging system developed by the Union for International Cancer Control and the American Joint Committee on Cancer.

Treatment

Treatment modalities are often used in combination. Surgery, such as a mastectomy pioneered by William Stewart Halsted, aims for local control. Radiation therapy techniques include brachytherapy and external beam radiation. Chemotherapy uses drugs like cisplatin and doxorubicin, while targeted therapy includes agents like imatinib for chronic myelogenous leukemia. Immunotherapy, such as checkpoint inhibitors like pembrolizumab, represents a major advance. Treatment plans are tailored using precision medicine principles.

Research and emerging therapies

Research spans from basic research in institutions like the Broad Institute to global clinical trials coordinated by groups like the European Organisation for Research and Treatment of Cancer. Emerging areas include cancer vaccines, adoptive cell transfer like CAR-T cell therapy developed by researchers including Carl June, and oncolytic virus therapy. Large-scale projects like The Cancer Genome Atlas have cataloged genomic alterations, informing new drug development by companies such as Genentech and Bristol Myers Squibb.

Epidemiology and prevention

Epidemiological studies by organizations like the World Health Organization track global cancer burden, identifying risk factors such as tobacco smoking and hepatitis B virus infection. Prevention strategies include vaccination against human papillomavirus and hepatitis B, and screening programs like mammography for breast cancer and colonoscopy for colorectal cancer. Public health initiatives, such as the Framework Convention on Tobacco Control, aim to reduce incidence. Research into chemoprevention continues at centers like the Fred Hutchinson Cancer Research Center. Category:Oncology Category:Medical specialties