Oral cancer is a malignant neoplasm that develops from the tissues of the oral cavity, including the lips, tongue, gums, buccal mucosa, pharynx, and soft palate. The main types of tumors that occur in this area are squamous cell carcinoma, adenocarcinoma, and sarcoma. Squamous cell carcinoma of the oral cavity is the most common type, which often occurs due to chronic inflammation caused by trauma, infection, or exposure to carcinogens. Oral cancer can develop as a single lesion or metastasize to regional lymph nodes and other organs, causing severe consequences for the patient's health.
History of the disease and interesting historical facts
The history of oral cancer research goes back several millennia. The first mentions of this disease can be found in medical texts of Ancient Egypt and Ancient India, which described oral diseases that could most likely be interpreted as cancer. In the Middle Ages, with the development of anatomy and surgery, oral tumors began to be studied in more detail. In the 16th century, the famous anatomist Andreas Vesalius described the changes that occur in tissues during malignant processes. In the 19th century, with the development of microscopy, it became possible to study the cellular structure of tumors, which gave impetus to a deeper understanding of the pathogenesis of oral cancer. In the 20th century, diagnostic and treatment protocols appeared, which to this day remain the basis of anti-cancer therapy. Interestingly, over the decades, there has been a change in the epidemiology of the disease, due to a decrease in smoking and an increase in the number of infections, such as the human papillomavirus (HPV).
Epidemiology (statistics of disease occurrence)
According to the World Health Organization, oral cancer ranks about 3% among all malignant neoplasms. According to statistics, more than 300,000 new cases of this type of cancer are registered worldwide every year. The highest incidence is observed in developing countries, where risk factors such as smoking and tobacco use in various forms, as well as excessive alcohol consumption, are common. According to the International Agency for Research on Cancer, in East Asia and South America, the incidence rate can reach 10 cases per 100,000 population, while in North America and Western Europe this figure is less than 5 cases per 100,000. The risk of developing oral cancer increases with age, with the greatest number of cases registered in men over 50 years of age.
Genetic predisposition to this disease
Genetic predisposition to oral cancer is still an active subject of research. To date, some key genes and mutations associated with an increased risk of this disease have been identified. One of them is the TP53 gene, which encodes the p53 protein, responsible for the regulation of the cell cycle and apoptosis. Mutations in this gene are associated with disturbances in the process of their cellular differentiation and increased cellular proliferation. Mutations in the CDKN2A and EGFR genes, which can affect carcinogenesis in the oral cavity, are also being studied. There is evidence that the presence of certain genetic polymorphisms, such as in the GSTM1 gene, can increase the predisposition to the development of squamous cell carcinoma. However, it is important to emphasize that genetic factors act in combination with exogenous factors, such as smoking, alcohol consumption and infections, which makes the issue of heredity quite complex.
Risk factors for the development of this disease
Risk factors for oral cancer are divided into physical and chemical. The main physical factors include:
- Smoking tobacco in any form, including cigarettes, cigars and chewing tobacco;
- Excessive alcohol consumption;
- Oral lesions of a traumatic nature, such as scars, long-standing ulcers.
Chemical factors that contribute to the development of cancer include:
- Exposure to bulk carcinogenic substances such as asbestos;
- Exposure of the oral cavity to chemicals, for example, as a result of using certain cosmetics;
- Infectious agents such as human papillomavirus (HPV), which may play an important role in carcinogenesis.
In addition to the above factors, there are also social and economic factors, such as low education, that may increase the risk of developing this disease in certain populations.
Diagnosis of this disease
Diagnosis of oral cancer involves several stages and is aimed at identifying characteristic changes in the tissues of the oral cavity. The main symptoms of the disease may include:
- Local pain or discomfort in the mouth area;
- The appearance of ulcers or tumors that do not heal over a long period of time;
- Changes in voice or difficulty swallowing;
- Discharge from the oral cavity with an unpleasant odor;
- Enlarged lymph nodes in the neck.
Laboratory tests include cytology and tumor biopsy, which help establish an accurate diagnosis. Radiological tests, such as X-rays, computed tomography (CT) scans, and magnetic resonance imaging (MRI), help determine the stage of the disease and the presence of metastases.
Other diagnostics may include visual examinations, as well as the use of endoscopy to evaluate internal structures. Differential diagnosis is important to exclude other diseases, such as infectious processes (eg, candidiasis) and inflammatory diseases of the oral mucosa.
Treatment
Treatment for oral cancer depends on the stage of the disease, the location of the tumor, and the general condition of the patient. The main approaches to treatment include:
- General treatment: chemotherapy and radiotherapy, used both as monotherapy and in combination therapy;
- Pharmacological treatment: the use of cytostatics and targeted drugs to slow the growth of tumor cells;
- Surgical treatment: tumor resection with possible removal of the lymph nodes in the presence of metastases;
- Other treatments include immunotherapy, which involves activating the patient's immune system to fight the tumor.
The choice of a specific treatment tactic is determined by the oncologist based on the individual characteristics of the patient and the characteristics of the tumor.
List of medications used to treat this disease
The following medications may be used to treat oral cancer:
- Cytostatics: cisplatin, carboplatin, fluorouracil;
- Targeted drugs: erlotinib, targeted antibodies;
- Pain relievers: nonsteroidal anti-inflammatory drugs (NSAIDs), opioids;
- Supportive care drugs: antibiotics to prevent infections.
It is important to note that the choice of therapy should be made by the attending physician, taking into account the individual indications of the patient.
Disease monitoring
Disease monitoring involves regular examinations of patients after completion of treatment. This allows for an assessment of the patient’s health and the early detection of possible relapses.
Control stages typically include:
- Visual examinations of the oral cavity;
- Laboratory tests for tumor markers;
- Radiological examinations, if necessary.
The prognosis for oral cancer depends on early diagnosis and adequate treatment, but overall the five-year survival rate is about 50%. Complications can arise both as a result of the disease itself and as a consequence of the treatment, such as oral dysfunction requiring additional rehabilitation.
Age-related features of the disease
Age-related features of oral cancer are expressed in different clinical presentations and disease progression. In young patients, cancer is more often associated with the human papillomavirus, while in older people, factors associated with smoking and alcohol come to the fore.
Oral cancer is extremely rare in children and adolescents and is usually a complication of other diseases, such as congenital abnormalities.
In older people, cancer has a more aggressive course, which, in turn, requires more careful monitoring and a specific approach to treatment that takes into account comorbid conditions.
Questions and Answers
- What are the main symptoms of oral cancer? The main symptoms include pain in the mouth, the appearance of non-healing ulcers, difficulty swallowing, and enlarged lymph nodes.
- How to diagnose oral cancer? Diagnosis includes examinations, laboratory tests, cytology, biopsy and radiological methods such as CT and MRI.
- What factors increase the risk of developing oral cancer? The main risk factors are smoking, alcohol consumption, chronic injuries and infections such as HPV.
- How is oral cancer treated? Treatment is based on surgery, chemotherapy and radiotherapy, individually selected by an oncologist.
- What is the prognosis for oral cancer? The prognosis depends on the stage of the disease, early diagnosis and adequacy of treatment, the average five-year survival is about 50%.
