Osteosarcoma

Osteosarcoma is a malignant tumor that mainly develops in bone tissue. Most often, it occurs in the metaphyses of long bones, such as the femur and tibia, as well as in the bones of the pelvis and shoulder. Osteosarcoma is highly aggressive, has the potential for metastasis, and causes severe pain. It occurs mainly in adolescents and young adults, which is associated with the active growth processes of bone tissue during these periods. The main pathogenetic mechanisms for the formation of osteosarcoma are genetic mutations and disruptions in the functioning of cellular mechanisms, which leads to disordered cell division and tumor formation.

History of the disease and interesting historical facts

Osteosarcoma was first described in the 19th century, and since then many hypotheses have been put forward about its nature. In the 1940s, the first systematic studies of this disease began. An interesting fact is that among famous historical figures who suffered from osteosarcoma, we can mention the outstanding writer and scientist Ralph Waldo Emerson, who died from this disease at the end of his life. Research in the 1950s became the basis for the development of chemotherapy methods, which significantly improved the prognosis for patients with osteosarcoma. In parallel with the development of surgery, including amputations and resections, the active implementation of a comprehensive approach to the treatment of osteosarcoma began.

Epidemiology

Osteosarcoma is a rare disease, but its prevalence remains high among malignant bone tumors. In the United States, the incidence of osteosarcoma is about 3-4 cases per 1 million people per year. In Europe, the incidence varies, but overall it remains high. The main age group affected by this disease is adolescents and young adults aged 10 to 20 years. Osteosarcoma accounts for about 20% of all primary malignant bone tumors. In addition, there is a gender and racial imbalance: the disease is diagnosed more often in men than in women, and there is a slightly higher incidence among black patients compared with other ethnic groups.

Genetic predisposition to this disease

Research suggests that osteosarcoma may be associated with certain genetic disorders. One of the most well-known syndromes that predispose to osteosarcoma is Li-Fraumenni syndrome, which is caused by mutations in the TP53 gene. Also, certain changes in the RB1 and INK4A/ARF genes may contribute to the development of osteosarcoma. It is important to note that the presence of predisposing mutations does not always lead to the disease, and the degree of predisposition may vary. However, genetic screening may be useful in identifying people at increased risk of developing osteosarcoma, allowing for timely monitoring and diagnosis.

Risk factors for the development of this disease

Risk factors for osteosarcoma can be divided into physical and chemical.

• Physical factors:
  • Radiation beams used in some medical procedures and tests may increase the risk of developing tumors.
  • Bone trauma may contribute to the development of osteosarcoma, although the evidence is not always clear.
• Chemical factors:
  • Some chemical compounds, such as arsenic and Hungarian poison orchis, are considered possible carcinogens.
  • Chemical exposures associated with manufacturing processes or the use of certain medications may also be associated with an increased risk.
• Other factors:
  • A family history of osteosarcoma or other malignancies may indicate a genetic predisposition.
  • Certain diseases, such as fibrous dysplasia, may increase the risk of developing osteosarcoma.

Diagnosis of this disease

Diagnosis of osteosarcoma includes several stages and methods aimed at identifying the tumor and determining its prevalence.

• Main symptoms:
  • Pain in the area of the affected bone is often the first symptom that attracts attention.
  • Swelling and enlargement of the soft tissues near the bone tissue.
  • Limited mobility of the limb in case of damage to large joints.
  • The presence of pathological fractures with minimal trauma.
• Laboratory tests:
  • A complete blood count may show signs of inflammation, but there are no specific markers for osteosarcoma.
  • Biopsy is the most informative method, allowing to confirm the diagnosis by histological examination.
• Radiological examinations:
  • X-rays are the first step in imaging and often help detect changes in bone tissue.
  • Computed tomography (CT) and magnetic resonance imaging (MRI) are used to examine the affected area in more detail and assess the condition of nearby tissues.
  • Positron emission tomography (PET) can be used to detect metastases.
• Other types of disease diagnostics:
  • Angiography may be useful in visualizing vascular changes in the tumor.
  • Dermatological examinations to exclude secondary tumors on the skin.
• Differential diagnosis:
  • Other bone tumors such as chondrosarcoma and traumatic cysts should be considered.
  • Rheumatic diseases can also mimic the symptoms of osteosarcoma and should be excluded.

Treatment

Treatment of osteosarcoma requires a comprehensive approach and includes several basic methods:

• General treatment:
  • Combination therapy, including chemotherapy, surgery and radiation therapy, is used to achieve maximum effect.
  • The treatment plan is determined depending on the stage of the disease and the general condition of the patient.
• Pharmacological treatment:
  • Chemotherapy is the main treatment for osteosarcoma and is started before surgery to shrink the tumor.
  • Anticancer drugs used include anthracyclines and methotrexate.
• Surgical treatment:
  • Tumor resection is a standard method when complete removal of the tumor is possible.
  • If the tumor is large, amputation is often required.
• Other types of treatment:
  • Immunotherapy and targeted therapy are being actively investigated as additional treatment options.
  • Palliative care can be used as the disease progresses to improve the patient's quality of life.

List of medications used to treat this disease

• Methotrexate
• Doxorubicin (Adriamycin)
• Cisnatine
• etoposide
• Ifosfamide
• Tamoxifen (in some cases)
• Gemcitabine (as an experimental treatment)

Disease monitoring

Osteosarcoma monitoring involves regular examinations and assessments of the patient's condition after primary treatment.

• Control stages:
  • Initial follow-up examinations are performed every 3-6 months during the first 2 years after completion of treatment.
  • With subsequent increase of intervals in the absence of relapses.
• Forecast:
  • The prognosis of the disease depends on the stage at diagnosis, general health and response to chemotherapy.
  • With early detection and adequate therapy, 5-year survival rates reach approximately 70%.
• Complications:
  • Metastatic spread of the disease can be observed in the lungs, which significantly worsens the prognosis.
  • Long-term effects of treatment may include problems with growth or limb function.

Age-related features of the disease

Osteosarcoma most often occurs in adolescents and young adults, but the clinical picture can vary significantly depending on the patient's age.

• In adolescents:
  • The disease can begin with pain in the joints or bones, progressing to significant tumor masses.
  • Often the diagnosis is made at a late stage due to underestimation of symptoms.
• In adults:
  • Osteosarcoma in adults can develop as a secondary disease, often against the background of previous benign tumors or in case of exposure to carcinogens.
  • The clinical course may be less aggressive than in adolescents, but with the risk of late diagnosis and worse prognosis.
• In the elderly:
  • Rarely, osteosarcoma can occur in older people, often with a complex underlying medical background.
  • The main task is to maintain quality of life, which requires an individual approach to treatment.

Questions and Answers

• What is osteosarcoma?
  Osteosarcoma is a malignant tumor that develops in bone tissue, most often in adolescents and young adults.
• How can osteosarcoma be diagnosed?
  Diagnosis includes X-rays, MRI, biopsy and laboratory tests aimed at confirming the presence of a tumor.
• What are the main treatments for osteosarcoma?
  The main treatments include chemotherapy, surgery and radiation therapy, depending on the stage of the disease.
• What are the risk factors associated with osteosarcoma?
  Risk factors include injury, radiation therapy, genetic predisposition, and exposure to certain chemicals.
• What is the prognosis for osteosarcoma?
  The prognosis depends on the stage of the disease and the response to treatment; with early detection, 5-year survival can reach 70%.