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3D Precision Therapy - How We Treat Your Cancer

Basic Knowledge About Cancer

Cancer is a generic term for a large group of diseases that can affect any part of the body. Other terms used are malignant tumours and neoplasms. One defining feature of cancer is the rapid creation of abnormal cells that grow beyond their usual boundaries, and which can then invade adjoining parts of the body and spread to other organs; the latter process is referred to as metastasis. Metastases are  the primary cause of death from cancer.

The problem

Cancer is a leading cause of death worldwide, accounting for nearly 10 million deaths in 2020 (1). The most common in 2020 (in terms of new cases of cancer) were:

  • breast (2.26 million cases);
  • lung (2.21 million cases);
  • colon and rectum (1.93 million cases);
  • prostate (1.41 million cases);
  • skin (non-melanoma) (1.20 million cases); and
  • stomach (1.09 million cases).

The most common causes of cancer death in 2020 were:

  • lung (1.80 million deaths);
  • colon and rectum (935 000 deaths);
  • liver (830 000 deaths);
  • stomach (769 000 deaths); and
  • breast (685 000 deaths).

What causes cancer?

Cancer arises from the transformation of normal cells into tumour cells in a multi-stage process that generally progresses from a pre-cancerous lesion to a malignant tumour. These changes are the result of the interaction between a person’s genetic factors and three categories of external agents, including:

  • physical carcinogens, such as ultraviolet and ionizing radiation;
  • chemical carcinogens, such as asbestos, components of tobacco smoke, aflatoxin (a food contaminant), and arsenic (a drinking water contaminant); and
  • biological carcinogens, such as infections from certain viruses, bacteria, or parasites.

WHO, through its cancer research agency, the International Agency for Research on Cancer (IARC), maintains a classification of cancer-causing agents.

The incidence of cancer rises dramatically with age, most likely due to a build-up of risks for specific cancers that increase with age. The overall risk accumulation is combined with the tendency for cellular repair mechanisms to be less effective as a person grows older.

Risk factors for cancers

Tobacco use, alcohol use, unhealthy diet, physical inactivity and air pollution are risk factors for cancer (and other noncommunicable diseases).

Some chronic infections are risk factors for cancer; this is a particular issue in low- and middle-income countries. Approximately 13% of cancers diagnosed in 2018 globally were attributed to carcinogenic infections, including Helicobacter pylori, human papillomavirus (HPV), hepatitis B virus, hepatitis C virus, and Epstein-Barr virus (3).

Hepatitis B and C viruses and some types of HPV increase the risk for liver and cervical cancer, respectively. Infection with HIV substantially increases the risk of cancers such as cervical cancer.

Reducing the cancer burden

Between 30 and 50% of cancers can currently be prevented by avoiding risk factors and implementing existing evidence-based prevention strategies. The cancer burden can also be reduced through early detection of cancer and appropriate treatment and care of patients who develop cancer. Many cancers have a high chance of cure if diagnosed early and treated appropriately.

Preventing cancer

Cancer risk can be reduced by:

  • not using tobacco;
  • maintaining a healthy body weight;
  • eating a healthy diet, including fruit and vegetables;
  • doing physical activity on a regular basis;
  • avoiding harmful use of alcohol;
  • getting vaccinated against HPV and hepatitis B if you belong to a group for which vaccination is recommended;
  • avoiding ultraviolet radiation (which primarily results from exposure to the sun and artificial tanning devices);
  • ensuring safe and appropriate use of radiation in health care (for diagnostic and therapeutic purposes);
  • minimizing occupational exposure to ionizing radiation; and
  • reducing exposure to outdoor air pollution and indoor air pollution, including radon (a radioactive gas produced from the natural decay of uranium, which can accumulate in buildings — homes, schools and workplaces).

Early detection

Cancer mortality can be reduced if cases are detected and treated early. There are two components of early detection:

Early diagnosis

When identified early, cancer is more likely to respond to treatment and can result in a greater probability of survival and less morbidity, as well as less expensive treatment. Significant improvements can be made in the lives of cancer patients by detecting cancer early and avoiding delays in care.

Early diagnosis consists of three components:

  • being aware of the symptoms of different forms of cancer and of the importance of seeking medical advice if you are concerned;
  • access to clinical evaluation and diagnostic services; and
  • timely referral to treatment services.

Early diagnosis of symptomatic cancers is relevant in all settings and the majority of cancers. Cancer programmes should be designed to reduce delays in, and barriers to, diagnosis, treatment and care.

Screening

Screening aims to identify individuals with findings suggestive of a specific cancer or pre-cancer before they have developed symptoms. When abnormalities are identified during screening, further tests to establish (or not) a diagnosis should follow, as should referral for treatment if needed.

Screening programmes are effective for some but not all cancer types and in general are far more complex and resource-intensive than early diagnosis as they require special equipment and dedicated personnel.

Patient selection for screening programmes is based on age and risk factors to avoid excessive false positive studies. Examples of screening methods are:

  • HPV testing for cervical cancer;
  • the PAP cytology test for cervical cancer;
  • visual inspection with acetic acid (VIA) for cervical cancer; and
  • mammography screening for breast cancer in settings with strong or relatively strong health systems.

 

Quality assurance is required for both screening and early diagnosis programmes.

Treatment

A correct cancer diagnosis is essential for appropriate and effective treatment because every cancer type requires a specific treatment regimen. Treatment usually includes radiotherapy, chemotherapy and/or surgery.  Determining the goals of treatment is an important first step. The primary goal is generally to cure cancer or to considerably prolong life. Improving the patient’s quality of life is also an important goal. This can be achieved by support for the patient’s physical, psychosocial and spiritual well-being and palliative care in terminal stages of cancer.

Some of the most common cancer types, such as breast cancer, cervical cancer, oral cancer, and colorectal cancer, have high cure rates when detected early and treated according to best practices.

Some cancer types, such as testicular seminoma and different types of leukaemia and lymphoma in children, also have high cure rates if appropriate treatment is provided, even when cancerous cells are present in other areas of the body.

Palliative care

Palliative care is treatment to relieve, rather than cure, symptoms caused by cancer and to improve the quality of life of patients and their families. Palliative care can help people live more comfortably. It is particularly needed in places with a high proportion of patients in advanced stages of cancer where there is little chance of cure.

Relief from physical, psychosocial, and spiritual problems through palliative care is possible for more than 90% of patients with advanced stages of cancer.

Effective public health strategies, comprising community- and home-based care, are essential to provide pain relief and palliative care for patients and their families.

Improved access to oral morphine is strongly recommended for the treatment of moderate to severe cancer pain, suffered by over 80% of people with cancer in the terminal phase.