Retinoblastoma is a malignant neoplasm of the retina that most often occurs in children. It is a tumor that can develop in one or both eyes and is usually diagnosed at an early age, almost always before the age of five. It is caused by changes in the genes that control the normal growth and development of retinal cells. Retinoblastoma can cause a variety of symptoms, including the kitten reflex (eyes that glow in the dark), squinting, and vision loss. If left untreated, this tumor can cause serious complications, including vision loss, and can be life-threatening.
History of the disease and interesting historical facts
Retinoblastoma was first described in 1809 by the French ophthalmologist Napoleon Müller. Despite this, more detailed studies of this disease have been conducted since the mid-20th century. One of the significant steps in the study of retinoblastoma was the introduction of special genetic diagnostics in the 1980-1990s, which made it possible to more accurately identify predisposition to the disease and develop targeted approaches to its treatment. Interestingly, the name "retinoblastoma" itself comes from the word "retina", meaning the retina, and "blastoma", indicating a malignant tumor developing from immature cells.
Epidemiology
According to the World Health Organization, retinoblastoma occurs in one in 15,000 to 20,000 newborns. This number can vary depending on geographic region, genetic predisposition, and other factors. More than 90% cases of the disease develop in children under 5 years of age, while 80% cases are detected before age 2. Retinoblastoma usually occurs equally in both boys and girls, but there are some racial differences in incidence and hereditary form of the disease.
Genetic predisposition to this disease
Retinoblastoma has a clear genetic basis. The main gene associated with the development of this disease is the RB1 gene, located on chromosome 13. Changes (mutations) in this gene lead to uncontrolled division of retinal cells. Mutations in RB1 can be either hereditary or spontaneous. In the hereditary form, the disease can be passed from parent to child with a probability of 50%. Moreover, children with the hereditary form have an increased risk of developing tumors in other places, such as the brain, which necessitates careful genetic testing and monitoring.
Risk factors for the development of this disease
There are several risk factors that contribute to the development of retinoblastoma:
- Genetic predisposition: the presence of close relatives with this tumor.
- Inherited mutations, including mutations in the RB1 gene.
- Existing congenital disorders such as Costman syndrome.
- Infections suffered during pregnancy, such as a viral infection.
- Environmental factors such as exposure to carcinogens in early childhood.
Diagnosis of this disease
Diagnosis of retinoblastoma includes several stages and methods:
1. Main symptoms:
— Kitten reflex (bream) in the pupil.
- Strabismus.
— Visual disturbances, including blurring or opacity.
- Redness or swelling around the eye.
2. Laboratory tests:
— Genetic testing to identify mutations in genes associated with retinoblastoma.
3. Radiological examinations:
— Ultrasound examination of the eye.
— Magnetic resonance imaging (MRI) to determine the extent of the tumor.
4. Other types of diagnostics:
— Potentially visual tests to assess retinal function.
— Ophthalmoscopy to assess the condition of the fundus.
5. Differential diagnosis:
— It is important to distinguish retinoblastoma from other eye diseases such as retinopathy of prematurity, chorioretinitis, and congenital cataracts.
Treatment
Treatment for retinoblastoma depends on the stage of the disease and may involve different approaches:
1. General treatment:
— Conservative observation in minor cases.
- Combined intervention in case of widespread prevalence.
2. Pharmacological treatment:
- Chemotherapy aimed at reducing the size of the tumor before surgery.
3. Surgical treatment:
— Tumor removal (the most common method).
— Enucleation (removal of the entire eye) in cases of advanced forms.
4. Other types of treatment:
- Radiation therapy for microscopic metastases.
List of medications used to treat this disease
Among the drugs used to treat retinoblastoma, the most commonly used are:
- Taxane drugs (eg, paclitaxel).
- Pharmaceutical analogues of cytotoxic agents (eg, carmustine).
- Vinblastine.
- Etoposide.
- Cisplatin.
Disease monitoring
Monitoring of patients with retinoblastoma includes regular eye examinations, genetic testing, and imaging studies. The prognosis depends on the stage of the disease at diagnosis. With early diagnosis and adequate treatment, the five-year survival rate is more than 90%. Possible complications include visual impairment, recurrence of the disease, and development of secondary tumors.
Age-related features of the disease
Given that the disease generally begins in early infancy, neonates and children under 2 years of age are more likely to have systemic manifestations. Later in life, the disease may present differently, less likely to show classic signs such as "kitten". It is most often diagnosed before the age of 5, and early treatment can significantly improve the prognosis.
Questions and Answers
- What are the main symptoms of retinoblastoma?
Major symptoms include kitten reflex, squinting and decreased vision. - What is the likelihood of inheriting retinoblastoma?
The inheritance probability is about 50% if one of the parents has a mutation in the RB1 gene. - What diagnostic tests are used to detect retinoblastoma?
Diagnostic methods include ophthalmoscopy, ultrasound, MRI and genetic testing. - What is the most effective treatment for retinoblastoma?
The most effective treatment is a combination approach that includes chemotherapy and surgical removal of the tumor. - What is the prognosis for children with retinoblastoma?
With early detection and treatment, the prognosis is positive, with survival rates reaching more than 90% at five years.
