Kidney cancer, also called renal cell cancer (RCC), is the abnormal growth of kidney cells caused by a change in the kidney's normal physiology. Cancer starts with the formation of a malignant tumour, which can metastasise to other vital parts of the body.
An individual with kidney or renal pelvis cancer may exhibit one or several of the symptoms enumerated herein.
Various forms of kidney cancer exist, including:
Renal cell carcinoma is the predominant kind of kidney cancer in adults, accounting for 85% of all cases. It presents as a tumour growth in one kidney and may also spread to the second kidney. The cancer originates in the cells that line the kidney's tubules, which are small tubes responsible for returning nutrients and fluids to the bloodstream. The predominant renal cell carcinoma (RCC) variant is clear cell renal cell carcinoma (ccRCC).
Among all renal cancers, transitional cell carcinomas occur in 6 to 7% of patients. This cancer typically originates at the junction of the ureter and the renal pelvis. This region is referred to as the renal pelvis. It can also occur in the ureters and bladder.
Renal sarcoma is the rarest type of kidney cancer, representing about 1% of kidney cancer cases. It originates in the connective tissues of the kidneys and, if left untreated, may disseminate to adjacent organs and bones.
This type of tumour is the predominant form of renal carcinoma in pediatric patients, accounting for around 5% of renal malignancies.
A risk factor is any element that elevates the likelihood of developing a disease, including cancer. Cancers exhibit varying risk factors. However, even when an individual with kidney cancer possesses a risk factor, it is frequently challenging to determine the extent to which that risk factor contributed to the tumour.
The risk factors may include the following;
A risk factor that cannot be changed by lifestyle modification is termed a non-modifiable risk factor. Age, gender, and family history are some examples of non-modifiable risk factors.
Kidney cancer predominantly occurs in individuals aged 65 to 74 years. The prevalence of kidney cancer in the paediatric population is very low. For example, 500 to 600 children in the United States are diagnosed with Wilms’ tumour annually.
Men exhibit a twofold increased likelihood of developing the disease compared to women. Kidney cancer incidence is most elevated among American Indian and Alaska Native populations in the United States. The rates are marginally elevated in the African American population compared to the White population. The reasons for this disparity remain unclear.
Regardless of known hereditary disorders, people with a strong family history of renal cell carcinoma (RCC) have a higher chance of developing the disease themselves. Those who have a family history of kidney cancer are more likely to develop the disease themselves. The risk is elevated for individuals with a sibling diagnosed with kidney cancer. This may result from shared genetic factors, common environmental exposures, or both.
A modifiable risk factor can be changed by lifestyle modification. Examples may include smoking, obesity, occupational exposure, etc.
Cancer of the kidneys is more common in smokers. Nearly 15% of all occurrences of kidney cancer can be traced back to smoking. This risk increases with the duration and quantity of cigarettes smoked.
Quitting smoking reduces the risk. After ten years of smoking cessation, the risk becomes essentially identical to that of people who have never smoked.
A higher chance of getting kidney cancer is associated with being overweight or obese. This causes around 25% of kidney malignancies. This means that almost a quarter of kidney malignancies are caused by being overweight or obese. The higher a person's weight, the greater the risk. Being overweight alters hormones in the body, especially in women. Changes in hormone balance may raise the risk of kidney cancer.
Kidney cancer risk increases with exposure to high-energy, ionising radiation. Getting radiation treatment for specific cancers is one example. Doctors ensure that the benefits of radiotherapy balance the tiny danger of developing a second malignancy. Radiotherapy treatment is appropriately planned, and newer approaches inflict less damage to healthy tissues.
The likelihood of developing kidney cancer is increased when working with specific substances. Take a job in the textile sector as an example. Cleaning or degreasing metal using chemicals is another option.
Additionally, research suggests that cadmium and arsenic exposure can cause kidney cancer. There are other potential contaminants, such as welding fumes and printing chemicals. The evidence for this, however, is scant. Such chemicals see very little application. Safeguards are in place to ensure your safety if you want to collaborate with them.
Some studies have discovered a relationship between high blood pressure or blood pressure medications and kidney cancer. The higher one's blood pressure, the greater the risk. It is more plausible that the link is high blood pressure than the medications used to manage it. High blood pressure can harm the kidneys and is a known risk factor for renal disease.
These include chronic kidney disease(CKD), excessive use of certain medications like NSAIDS, and treatments like dialysis etc.
American researchers examined the findings from 20 investigations conducted in six different nations. They discovered that certain moderate painkillers are associated with an increased risk of kidney cancer. Nonsteroidal anti-inflammatory medicines (NSAIDs) may marginally increase the risk of kidney cancer. These include ibuprofen. Although aspirin is an NSAID, it does not appear to raise the risk of kidney cancer. Taking paracetamol may also increase the risk. However, using these medications seldom or at modest doses is unlikely to be dangerous.
Parents also transfer gene mutations to their offspring, increasing the risk of RCC. However, it can occasionally result in a hereditary syndrome that raises a person's risk of developing additional health problems (including cancer).
People with inherited RCC-related diseases should see their doctors regularly, especially if they have already been diagnosed. Some doctors may advise these patients to undergo routine imaging procedures, like CT scans, to detect new kidney tumours.
Although they only account for a small fraction of all kidney malignancies, the majority of the following illnesses do enhance the risk of developing kidney cancer.
People with von Hippel-Lindau disease can develop many different types of tumours and cysts (fluid-filled sacs) in their bodies. They are more likely to create clear cell RCC, especially when young. In addition to pheochromocytoma, a benign adrenal gland tumour, they may also have benign tumours of the eyes, brain, spinal cord, and pancreas. Mutations in the VHL gene are the root cause of this illness.
As with the other genetic diseases discussed below, individuals with hereditary papillary renal carcinoma have one or more papillary renal cell carcinomas (RCCs) but do not have tumours in different areas of their bodies. The MET gene is a common location for mutations that cause this disorder.
Smooth muscle tumours, such as papillary RCCs, leiomyomas (fibroids) of the skin and uterus (in women), and others, are more common in people with this illness. Some research has linked mutations in the FH gene to this condition.
A number of kidney cancers, such as renal cell carcinomas (RCCs) and oncocytomas, as well as tiny benign skin tumours, are more common in people with this syndrome. They are also at increased risk for developing cancer, either benign or malignant, in various tissues. Some research has connected mutations in the FLCN gene to this illness.
Multiple benign tumours in different organs, such as the skin, brain, lungs, eyes, kidneys, and heart, are common in people with tuberous sclerosis. Clear cell renal cell carcinoma (RCC) is an uncommon but possible complication of kidney tumours, which are usually benign. Affected individuals often have mutations in the TSC1 and TSC2 genes.
There are both hereditary and environmental variables that can increase the risk of kidney cancer. Inherited diseases like von Hippel-Lindau’s disease (VHL) and hereditary renal disorders make people much more likely to get them. Certain lifestyle choices, like smoking, being overweight, having high blood pressure, and eating a lot of red meat, make the risk even higher. New worries include being inactive and potentially exposed to harmful environmental chemicals, which need additional research.
