Example of Oncology

Definition

Oncology is the branch of medicine that deals with the diagnosis, treatment, and study of cancer, originating from the Greek word "onkos," meaning tumor, with significant contributions from Rudolf Virchow, a 19th-century German physician who first recognized the cellular basis of cancer.

How It Works

The diagnosis of cancer typically involves a combination of physical examinations, imaging tests, and biopsy procedures, where a sample of tissue is examined for abnormal cell growth, with the TNM staging system used to classify the extent of cancer spread. Cancer treatment often involves surgery, chemotherapy, and radiation therapy, which can be used alone or in combination, depending on the type and stage of cancer, with hormone therapy and immunotherapy also being used to treat specific types of cancer, such as breast and prostate cancer. The treatment of cancer is often guided by clinical practice guidelines, such as those developed by the National Comprehensive Cancer Network, which provide evidence-based recommendations for the management of different types of cancer, with ~1.8 million new cancer cases diagnosed annually in the United States (Centers for Disease Control and Prevention).

The treatment of cancer can be further tailored to individual patients through the use of molecular diagnostics, which can identify specific genetic mutations or other molecular characteristics of a patient's cancer, with next-generation sequencing allowing for the rapid and cost-effective analysis of large amounts of genomic data. For example, the BRCA1 and BRCA2 genes are associated with an increased risk of breast and ovarian cancer, with genetic testing available to identify individuals who carry these mutations, and parp inhibitors being used to treat cancers with BRCA mutations. The development of new cancer treatments is often driven by advances in our understanding of the biology of cancer, with cancer stem cells and the tumor microenvironment being areas of active research, and Cancer Research UK investing ~£400 million annually in cancer research.

The management of cancer also involves the use of palliative care, which focuses on relieving the symptoms and stress of cancer, rather than treating the cancer itself, with hospice care being used to support patients with advanced cancer, and supportive care being used to manage the side effects of cancer treatment. The use of electronic health records and health information technology can also improve the management of cancer, by facilitating the sharing of information between healthcare providers and patients, with MD Anderson Cancer Center using electronic health records to manage the care of its patients.

Key Components

• Tumor biology: understanding the biology of cancer is critical to the development of effective treatments, with cancer cell lines being used to study the behavior of cancer cells in the laboratory.
• Imaging tests: imaging tests, such as CT scans and MRI scans, are used to diagnose and stage cancer, with PET scans being used to monitor the response of cancer to treatment.
• Surgical oncology: surgery is often used to treat cancer, with lumpectomy and mastectomy being used to treat breast cancer, and prostatectomy being used to treat prostate cancer.
• Chemotherapy: chemotherapy is used to treat cancer, with anthracyclines and taxanes being used to treat breast cancer, and platinum-based chemotherapy being used to treat ovarian cancer.
• Clinical trials: clinical trials are used to evaluate the safety and effectiveness of new cancer treatments, with phase I, phase II, and phase III trials being used to test the safety and efficacy of new treatments.
• Cancer registries: cancer registries, such as the Surveillance, Epidemiology, and End Results (SEER) program, are used to collect data on cancer incidence and mortality, with ~14 million new cancer cases diagnosed worldwide annually (International Agency for Research on Cancer).

Common Misconceptions

• Myth: Cancer is a single disease — Fact: Cancer is a group of more than 100 different diseases, with different types of cancer having distinct histological and molecular characteristics, and lung cancer being the leading cause of cancer deaths worldwide (World Health Organization).
• Myth: Cancer is always caused by genetic mutations — Fact: While genetic mutations can contribute to the development of cancer, environmental factors, such as tobacco smoke and ultraviolet radiation, also play a significant role, with ~30% of cancer deaths being attributable to tobacco use (Centers for Disease Control and Prevention).
• Myth: Cancer treatment is always curative — Fact: While cancer treatment can be curative for some types of cancer, palliative care is often used to manage the symptoms and stress of cancer, particularly for patients with advanced cancer, and hospice care being used to support patients with terminal cancer.
• Myth: Cancer is a disease of old age — Fact: While the risk of cancer does increase with age, cancer can occur at any age, with ~10% of cancer cases being diagnosed in people under the age of 40 (National Cancer Institute).

In Practice

The University of Texas MD Anderson Cancer Center is a leading cancer treatment and research institution, with a $1.3 billion annual budget and ~8,000 employees, and Bristol-Myers Squibb investing ~$4 billion annually in cancer research and development. The center uses a multidisciplinary approach to cancer treatment, with surgical oncologists, medical oncologists, and radiation oncologists working together to develop individualized treatment plans for patients, and cancer researchers using next-generation sequencing to identify new targets for cancer therapy. The center also has a $200 million annual budget for clinical trials, with ~1,000 clinical trials being conducted annually, and IBM Watson for Oncology being used to support cancer treatment decisions.