Top 4 Pancreatic Cancer Causes You Need to Watch Out For

Byadmin

Pancreatic cancer is no longer a rare whisper in the world of oncology, it’s a growing storm. In 2022 alone, an estimated 510,992 new cases were diagnosed worldwide, with nearly as many deaths recorded the same year. This deadly disease has seen its global burden more than double over the past few decades, rising from about 207,000 cases in 1990 to over 508,000 cases by 2021.

Despite medical advances, this trend shows no sign of slowing, and pancreatic cancer is projected to further escalate as populations age and lifestyle risk factors become more widespread.

Millions of people feel uncertain about what these numbers mean for them. Many live in fear of the diagnosis without understanding the roots of the disease. They notice a subtle symptom here or there, wonder if it’s just indigestion, and ask themselves: Could this be pancreatic cancer?

That confusion and anxiety are part of what makes this disease so troubling, it creeps in quietly, often without early warning signs, and strikes hard. People care deeply about pancreatic cancer causes.

They want to know if their diet, habits, family history, or medical conditions could put them at greater risk. This isn’t mere curiosity, it’s self‑preservation. Awareness about causes is not just informative, it’s empowering. It’s the first step toward prevention, early detection, and potentially saving lives.

In this article, we will explore the top pancreatic cancer causes, shedding light on the lifestyle factors, genetic predispositions, and environmental triggers that could increase your risk.

We’ll break down the most recent research and offer practical advice on what you can do to reduce your chances of developing this formidable disease. Understanding the causes is the first step toward prevention and early detection, and by reading further, you’ll gain valuable insights into how to protect your health.

Pancreatic Cancer Causes

Inherited Genetic Mutations

The direct pancreatic cancer causes are specific inherited or acquired genetic mutations that trigger the uncontrolled growth of cells in the pancreas. These mutations disrupt critical cellular processes, such as cell division and DNA repair, leading directly to the formation of malignant tumors.

Several inherited genetic syndromes, caused by mutations in specific genes passed down through families, can directly cause an elevated lifetime risk of developing pancreatic cancer.

These syndromes are responsible for approximately 10% of all pancreatic cancer cases and are characterized by a strong family history of pancreatic, breast, ovarian, or colon cancers. Individuals with these syndromes are often recommended for surveillance and screening programs. These key hereditary syndromes include:

  • Hereditary Breast and Ovarian Cancer (HBOC) Syndrome: Caused by mutations in the BRCA1 and, more significantly for pancreatic cancer, BRCA2 genes. BRCA2 mutations are among the most common inherited causes, increasing the lifetime risk of pancreatic cancer by 3 to 10 times the general population’s risk. These genes normally produce proteins that repair damaged DNA, and when they are mutated, this repair mechanism fails, allowing cancer-causing mutations to accumulate.
  • Peutz-Jeghers Syndrome (PJS): This is a rare syndrome caused by mutations in the STK11 gene. It is characterized by the development of noncancerous polyps in the gastrointestinal tract and dark freckling around the mouth, eyes, and nostrils. Individuals with PJS have a very high lifetime risk of developing various cancers, with the risk for pancreatic cancer being estimated at over 100 times that of the average person.
  • Familial Atypical Multiple Mole Melanoma (FAMMM) Syndrome: Linked to mutations in the CDKN2A gene, FAMMM increases the risk of both melanoma (a type of skin cancer) and pancreatic cancer. The lifetime risk for pancreatic cancer in individuals with this syndrome can be 13 to 22 times higher than in the general population.
  • Lynch Syndrome (Hereditary Non-Polyposis Colorectal Cancer): Caused by mutations in mismatch repair genes like MLH1, MSH2, MSH6, and PMS2, Lynch syndrome primarily increases the risk of colorectal cancer but also elevates the risk for pancreatic cancer and several other cancers.
  • Hereditary Pancreatitis: This condition involves recurrent episodes of pancreatic inflammation starting at a young age and is most often caused by mutations in the PRSS1 gene. The chronic inflammation associated with this syndrome dramatically increases the lifetime risk of pancreatic cancer, with some estimates as high as 40-50% by age 70.
  • Other Key Genes: Mutations in other genes, such as PALB2 (Partner and Localizer of BRCA2) and ATM (Ataxia-Telangiectasia Mutated), which are also involved in DNA repair pathways, are recognized as conferring a moderate to high risk for pancreatic cancer.

Bad Lifestyle Choices

Several key modifiable lifestyle choices significantly increase the risk of developing pancreatic cancer, most notably tobacco use, heavy alcohol consumption, obesity, and certain dietary patterns. These factors contribute to chronic inflammation, cellular damage, and metabolic disruptions that create a favorable environment for cancerous cells to emerge and proliferate in the pancreas.

The strongest and most well-established lifestyle risk factor is tobacco use. Smoking cigarettes, cigars, and pipes, as well as using smokeless tobacco products, is estimated to cause 20-30% of all pancreatic cancer cases. The carcinogens present in tobacco are absorbed into the bloodstream and can directly damage pancreatic cell DNA, leading to mutations in critical genes like KRAS, a common initiator of pancreatic cancer.

The risk increases with the duration and intensity of smoking and, importantly, decreases over time after quitting, although it may take up to 20 years for an ex-smoker’s risk to return to that of a person who has never smoked.

Excess body weight, or obesity, is another major risk factor. Individuals with a body mass index (BMI) of 30 or higher have a notably increased risk compared to those with a healthy weight.

Obesity is linked to chronic low-grade inflammation throughout the body, as well as elevated levels of insulin and other growth factors that can fuel the growth of cancer cells. The metabolic changes associated with obesity, such as insulin resistance, are thought to directly stress the pancreas.

Heavy alcohol consumption is also strongly linked to pancreatic cancer, primarily through its role in causing chronic pancreatitis. Chronic pancreatitis is a condition of persistent inflammation of the pancreas, which is one of the strongest known risk factors for the disease. While moderate alcohol intake has not been clearly linked to increased risk, long-term, heavy use can lead to irreversible pancreatic damage.

Finally, dietary patterns play a role. Diets high in red and processed meats (such as bacon, sausage, and deli meats) have been associated with a moderately increased risk.

The exact mechanisms are still under investigation but may be related to the carcinogens formed during high-temperature cooking or the preservatives used in processed meats. Conversely, a diet rich in fruits, vegetables, and whole grains may be protective.

Medical Conditions and Personal History Factors

Several pre-existing medical conditions and personal history factors can substantially elevate the risk of pancreatic cancer, primarily by causing chronic inflammation, metabolic stress, or cellular damage within the pancreas over an extended period.

These conditions are often non-modifiable or difficult to manage, making individuals with these histories a high-risk population that may require closer medical surveillance.

Chronic pancreatitis is perhaps the most significant medical risk factor. This condition involves long-term, persistent inflammation of the pancreas, which can lead to the scarring and destruction of pancreatic tissue. This constant state of cellular injury and repair increases the rate of cell turnover and, consequently, the chances of DNA errors occurring during cell division.

Over many years, this process can lead to the development of cancerous cells. The risk is particularly high in cases of hereditary pancreatitis but is also significantly elevated in individuals with pancreatitis caused by heavy alcohol use or other factors.

Long-standing diabetes mellitus, particularly type 2 diabetes, is also clearly linked to an increased risk of pancreatic cancer. The relationship is complex and appears to be bidirectional; long-standing diabetes is a risk factor for the cancer, but new-onset diabetes in an older adult can also be an early symptom of an undiagnosed pancreatic tumor.

It is believed that the elevated levels of insulin and glucose (hyperinsulinemia and hyperglycemia) associated with type 2 diabetes and insulin resistance create a metabolic environment that promotes the growth of cancer cells.

Cirrhosis of the liver, which is severe scarring of the liver often caused by chronic alcohol abuse or viral hepatitis, has also been identified as a risk factor. While the mechanism is less direct, it may be related to systemic inflammation and metabolic disruptions that affect the entire digestive system, including the pancreas.

Infections can also play a role. There is growing evidence that chronic infection with the bacterium Helicobacter pylori (H. pylori), which is a major cause of stomach ulcers, may increase the risk of pancreatic cancer.

Similarly, infection with hepatitis B or C viruses has been associated with a higher risk, potentially through pathways involving chronic inflammation. A personal or family history of certain cancers, especially those linked to specific genetic syndromes, also constitutes a major personal history risk factor.

Age, Gender, and Ethnicity

These non-modifiable factors reflect a combination of biological processes, genetic predispositions, and potentially different environmental exposures among various population groups. They are crucial for understanding population-level trends and identifying individuals who may warrant heightened awareness or surveillance.

Age is the single most significant demographic risk factor. The risk of pancreatic cancer increases dramatically with advancing age, with the vast majority of cases, about 90%, occurring in individuals over the age of 55, and more than two-thirds of diagnoses occurring in those over 65. The median age at diagnosis is around 70. This strong correlation with age is likely due to the accumulation of cancer-causing genetic mutations over a lifetime.

As cells divide over many decades, the chances of random errors in DNA replication increase, and the body’s DNA repair mechanisms may become less efficient, allowing these mutations to persist and lead to cancer.

There is a slight but consistent difference in incidence based on gender. Men are slightly more likely to be diagnosed with pancreatic cancer than women. Some of this disparity may be attributable to higher rates of certain risk factors in men, particularly smoking and heavy alcohol consumption.

However, even after accounting for these lifestyle factors, a small difference remains, suggesting that underlying biological or hormonal factors may also play a role.

Ethnicity and race also influence risk. In the United States, African Americans have a higher incidence of pancreatic cancer compared to white Americans and other ethnic groups.

The reasons for this disparity are complex and not fully understood but are thought to involve a combination of factors, including a higher prevalence of risk factors like smoking, obesity, and diabetes, as well as potential socioeconomic disparities in healthcare access and environmental exposures.

Additionally, individuals of Ashkenazi Jewish descent have a higher risk, which is largely attributed to a higher prevalence of inherited genetic mutations, particularly in the BRCA1 and BRCA2 genes, within this population. These demographic patterns underscore the multifaceted nature of pancreatic cancer risk, which involves an intricate interplay of genetics, environment, and biology.

Who is Considered High-risk and Eligible For Pancreatic Cancer Screening?

Individuals considered high-risk and thus eligible for surveillance programs typically have a significant genetic or familial predisposition. This group is not defined by lifestyle factors alone but by specific inherited criteria that dramatically elevate their lifetime risk.

The most common qualifiers are individuals with a strong family history, such as having two or more first-degree relatives (a parent, sibling, or child) with pancreatic cancer, or at least one first-degree relative diagnosed before age 50.

Additionally, those who carry known pathogenic germline variants in genes associated with pancreatic cancer are also deemed high-risk. To effectively monitor these individuals, specialized screening protocols are recommended.

  • Genetic Syndromes: Individuals with syndromes like Peutz-Jeghers syndrome, Hereditary Pancreatitis, Lynch syndrome, or carriers of mutations in genes such as BRCA1, BRCA2, PALB2, and ATM meet the criteria for screening.
  • Screening Methods: The primary screening tools are endoscopic ultrasound (EUS), which provides detailed images of the pancreas from inside the digestive tract, and magnetic resonance imaging (MRI) combined with magnetic resonance cholangiopancreatography (MRCP), which visualizes the pancreatic ducts without radiation.
  • Program Goals: These surveillance programs aim to detect precancerous lesions or pancreatic cancer at an early, more treatable stage, improving the potential for successful surgical intervention and long-term survival.

Risk Factors for Pancreatic Cancer vs. Those for Stomach Cancer

While both pancreatic and stomach cancers are malignancies of the digestive system with some overlapping risk factors, they also possess distinct etiological profiles. Shared risk factors include smoking, which significantly increases the risk for both cancers, and obesity, which contributes to chronic inflammation throughout the body.

Additionally, infection with the bacterium Helicobacter pylori (H. pylori) is a well-established major risk factor for stomach cancer and has been increasingly associated with a moderately increased risk for pancreatic cancer as well.

A family history of either cancer also elevates an individual’s risk. However, many risk factors are unique to each cancer, reflecting their different locations and functions within the digestive system.

  • Pancreatic Cancer: Unique risk factors are strongly linked to the pancreas itself. Chronic pancreatitis (long-term inflammation of the pancreas), new-onset diabetes in adults over 50, and inherited genetic mutations (BRCA1, BRCA2, PALB2) are major contributors.
  • Stomach Cancer: Distinct risk factors are often related to diet and direct exposure within the stomach lining. A diet high in salty, smoked, or pickled foods is a significant risk factor, as is long-term gastroesophageal reflux disease (GERD), pernicious anemia, and a history of stomach surgery (gastrectomy).
  • Comparative Impact: The influence of genetics appears more pronounced in pancreatic cancer risk, whereas dietary habits and direct infectious agents play a more dominant role in the development of stomach cancer.

Gut Microbiome and Pancreatic Cancer

Emerging research is uncovering a fascinating and complex link between the gut microbiome, the community of trillions of microorganisms living in the digestive tract, and the development of pancreatic cancer.

This field of study suggests that the composition of bacteria in the gut, and even within the pancreas itself, can influence tumor initiation and progression. The pancreas was once thought to be a sterile organ, but recent evidence shows it has its own unique microbial signature that changes in the presence of cancer.

A key finding is that certain bacterial populations are more prevalent in patients with pancreatic ductal adenocarcinoma (PDAC), the most common type of pancreatic cancer. This connection is thought to operate through several potential mechanisms, highlighting a new frontier in cancer biology.

  • Inflammation and Immune Response: An imbalance in the gut microbiome, known as dysbiosis, can promote chronic low-grade inflammation. This inflammation can travel from the gut to the pancreas, creating an environment that supports tumor growth. Specific bacteria may also modulate the body’s immune response, either helping or hindering its ability to fight cancer cells.
  • Bacterial Translocation: Studies suggest that bacteria can migrate from the gut to the pancreas through the biliary duct. The presence of specific oral bacteria, such as Porphyromonas gingivalis and Fusobacterium nucleatum, in pancreatic tumors has been associated with a poorer prognosis.
  • Future Directions: This research is still in its early stages, but it holds promise for developing new diagnostic tools (e.g., microbiome-based biomarkers) and therapeutic strategies, such as using probiotics or targeted antibiotics to alter the microbiome and potentially improve treatment outcomes.

Pancreatic Cancer Diagnosis

The diagnostic process for pancreatic cancer is a multi-step journey that often starts when a person develops telltale symptoms like jaundice, abdominal pain, or unexplained weight loss, or when a high-risk individual undergoes screening. The initial step involves comprehensive imaging to visualize the pancreas and surrounding structures.

A high-resolution computed tomography (CT) scan of the abdomen is typically the first and most crucial imaging test, as it can reveal a tumor, its size, and whether it has spread to nearby blood vessels or organs. If the CT scan is inconclusive or more detail is needed, an MRI or EUS may be performed. Following imaging, blood tests are used to gather more information and support the diagnosis.

  • Tumor Markers: A key blood test measures the level of a protein called CA 19-9. While elevated levels can suggest pancreatic cancer, this marker is not definitive, as it can also be raised by other conditions like pancreatitis or bile duct obstruction.
  • Liver Function Tests: These tests are conducted to check for bile duct blockage, a common complication when a tumor in the head of the pancreas presses on the bile duct.
  • Biopsy for Confirmation: The only way to definitively confirm a diagnosis of pancreatic cancer is through a biopsy, where a small tissue sample is removed from the suspicious mass and examined under a microscope by a pathologist. This is often done during an EUS or via a fine-needle aspiration guided by CT.

Pancreatic Cancer Treatment

Pancreatic cancer remains one of the most challenging cancers to treat. This is due to its often late diagnosis, its aggressive nature, and the critical role the pancreas plays in digestion and hormone regulation.

However, advancements in medical research, technology, and treatment approaches have improved the outlook for some patients. Understanding the various treatment options available for pancreatic cancer is crucial, as personalized care plans can significantly impact survival rates and quality of life.

Surgical Treatment

Surgery is the most effective treatment option for early-stage pancreatic cancer. It offers the best chance for long-term survival, but only about 20% of patients are eligible for surgery at the time of diagnosis. This is because many cases are diagnosed at later stages, after the cancer has spread to other organs. The two primary surgical procedures used to treat pancreatic cancer are:

  • Whipple Procedure (Pancreaticoduodenectomy):
    The Whipple procedure is the most common surgery for tumors located in the head of the pancreas. During this procedure, the surgeon removes the head of the pancreas, part of the small intestine (duodenum), gallbladder, and bile duct. The remaining portions of the pancreas, stomach, and intestines are then reconnected to allow for normal digestion. This procedure is complex and requires a highly skilled surgical team.
    Although the Whipple procedure offers the possibility of a cure, it carries significant risks, including complications like infection, bleeding, or leaks at the surgical sites. The recovery process can also be lengthy, requiring several weeks of hospital care followed by months of rehabilitation.
  • Distal Pancreatectomy:
    If the tumor is located in the body or tail of the pancreas, a distal pancreatectomy may be performed. This surgery involves the removal of the body and tail of the pancreas, with or without the spleen. While this procedure is less complex than the Whipple, it still carries risks of complications such as bleeding or infection. The recovery time may be shorter, but it still requires careful post-operative monitoring.

In rare cases, a total pancreatectomy may be performed, which involves the removal of the entire pancreas. This is typically only considered when the tumor is widespread within the pancreas.

Chemotherapy

Chemotherapy is the most commonly used treatment for pancreatic cancer, especially for patients whose cancer cannot be removed surgically. It is often used to shrink tumors before surgery (neoadjuvant chemotherapy) or to kill any remaining cancer cells after surgery (adjuvant chemotherapy).

The standard chemotherapy regimens for pancreatic cancer include combinations of drugs like gemcitabine (Gemzar) and nab-paclitaxel (Abraxane), as well as FOLFIRINOX (a combination of 5-fluorouracil, leucovorin, irinotecan, and oxaliplatin). These drugs work by targeting rapidly dividing cancer cells, inhibiting their ability to grow and spread.

  • Gemcitabine: This is one of the most commonly used chemotherapy drugs for pancreatic cancer. It is often the first line of treatment for patients with advanced stages of the disease. While gemcitabine can extend survival in some patients, its effectiveness is limited and often only provides a temporary improvement in symptoms.
  • FOLFIRINOX: This is a more aggressive chemotherapy regimen that is typically reserved for patients who are in good physical condition and can tolerate stronger treatment. It has shown better results than gemcitabine alone in clinical trials but comes with higher rates of side effects such as nausea, fatigue, and low blood cell counts.

Chemotherapy for pancreatic cancer can be extremely taxing on the body. Common side effects include nausea, vomiting, hair loss, fatigue, and an increased risk of infection. Additionally, chemotherapy can suppress bone marrow function, leading to low red and white blood cell counts, which may require blood transfusions or adjustments to the treatment plan.

Radiation Therapy

Radiation therapy uses high-energy rays, such as X-rays or protons, to target and kill cancer cells. It is not typically used as a primary treatment for pancreatic cancer but may be recommended in combination with surgery, chemotherapy, or as palliative care for advanced stages.

  • External Beam Radiation Therapy: In external beam radiation therapy, a machine directs radiation beams from outside the body toward the cancerous tumor. This type of therapy is usually delivered over several weeks in daily sessions. While radiation therapy can help shrink tumors and alleviate symptoms such as pain, it is rarely a curative treatment for pancreatic cancer on its own.
  • Stereotactic Body Radiation Therapy (SBRT): SBRT is a more advanced form of radiation therapy that delivers higher doses of radiation with pinpoint accuracy. This treatment is often used when the tumor cannot be surgically removed or when chemotherapy alone has not been effective. SBRT is typically used for tumors located in the pancreas or nearby organs that are difficult to treat with conventional radiation.

Radiation therapy can cause side effects like fatigue, skin irritation, nausea, and damage to nearby healthy tissue. The pancreas is located near critical organs like the liver, stomach, and small intestine, so there is always a risk of affecting these organs during radiation therapy.

Targeted Therapy

Targeted therapy is an emerging treatment that focuses on blocking specific molecules involved in the growth and spread of cancer cells. Unlike traditional chemotherapy, which affects all rapidly dividing cells, targeted therapy aims to disrupt only the cancerous cells, leading to fewer side effects.

Drugs such as erlotinib (Tarceva) and olaparib (Lynparza) have been explored as targeted treatments for pancreatic cancer. Erlotinib, for example, targets the epidermal growth factor receptor (EGFR), which is overactive in many cancers.

Olaparib is a type of PARP inhibitor that works on cancers with specific genetic mutations. While targeted therapy has shown promise in some clinical trials, it is not yet a standard part of treatment for pancreatic cancer. Research is ongoing to determine which patients are most likely to benefit from these drugs.

Immunotherapy

Immunotherapy is a type of cancer treatment that helps the body’s immune system recognize and attack cancer cells. It has shown limited success in treating pancreatic cancer, primarily in clinical trial settings.

One type of immunotherapy that has been explored for pancreatic cancer is checkpoint inhibitors. These drugs work by blocking the immune system’s checkpoints, allowing T-cells to recognize and kill cancer cells. Drugs like nivolumab (Opdivo) and pembrolizumab (Keytruda) are currently being studied in clinical trials for their effectiveness against pancreatic cancer.

While checkpoint inhibitors have been successful in treating other cancers, their results in pancreatic cancer have been mixed, leading researchers to explore combinations of immunotherapy with chemotherapy or radiation for enhanced results.

Palliative Care

For patients with advanced pancreatic cancer, the primary goal may shift from cure to symptom relief and quality of life improvement. Palliative care focuses on managing pain and alleviating the symptoms associated with the disease.

Pancreatic cancer often causes significant pain, which can be managed with medications like opioids, nerve blocks, or radiation therapy. Additionally, endoscopic procedures may be used to relieve blockages in the bile duct or small intestine, which are common in advanced pancreatic cancer.

Because the pancreas plays a key role in digestion, patients with pancreatic cancer often experience difficulty eating. Nutritional support, including enzyme supplements and feeding tubes, can help patients maintain adequate nutrition during treatment.

FAQs

1. How can you prevent pancreatic cancer?

While there is no surefire way to prevent pancreatic cancer, certain lifestyle choices can reduce your risk. Maintaining a healthy weight, avoiding smoking, limiting alcohol consumption, and following a balanced diet rich in fruits, vegetables, and whole grains are some key preventive measures.

Additionally, managing chronic conditions like diabetes and high blood pressure can also help lower the risk of developing pancreatic cancer. Early detection through regular check-ups, especially for those with a family history, may improve treatment outcomes.

2. What is the survival rate for pancreatic cancer?

The survival rate for pancreatic cancer is relatively low compared to other cancers, mainly due to late-stage diagnosis. According to the American Cancer Society, the 5-year survival rate for all stages of pancreatic cancer is about 10%.

However, if the cancer is caught early and is surgically removed, the survival rate can be significantly higher. The survival rate drops dramatically for patients with advanced, metastatic pancreatic cancer, highlighting the importance of early detection and intervention.

3. What were your first signs of pancreatic cancer?

The first signs of pancreatic cancer are often vague and easily attributed to other conditions, which is why the disease is often diagnosed late. Early symptoms may include unexplained weight loss, abdominal or back pain, jaundice (yellowing of the skin or eyes), and changes in stool or urine color.

Some patients may also experience loss of appetite, nausea, or new-onset diabetes. Since these symptoms can be associated with various health issues, it’s important to consult a doctor if they persist.

4. What foods should you avoid to reduce the risk of pancreatic cancer?

To lower the risk of pancreatic cancer, it’s advisable to limit the intake of processed meats, red meats, and foods high in saturated fats. These foods may contribute to inflammation and oxidative stress, which can increase the risk of cancer.

Additionally, limiting alcohol consumption and avoiding sugary drinks can also help. A diet rich in antioxidants, fiber, and healthy fats from sources like fish, nuts, and olive oil is recommended to support overall pancreatic health.

5. Can you live without your pancreas?

Yes, it is possible to live without a pancreas, although it comes with significant lifestyle changes. If the pancreas is removed due to cancer or other medical reasons, patients will need to take enzyme replacements to aid in digestion and insulin therapy to regulate blood sugar.

The pancreas plays a critical role in both digestion and hormone production, so patients will require ongoing care and adjustments to their diet and medication regimen. With proper management, people can lead relatively normal lives after pancreatectomy (pancreas removal).

Conclusion

Understanding the pancreatic cancer causes is the first step in combating this aggressive disease. While factors like smoking, obesity, and family history play a significant role, ongoing research into genetic mutations, environmental influences, and lifestyle choices is shedding new light on the complexities of this cancer.

As we learn more about the origins of pancreatic cancer, it becomes increasingly clear that early detection, prevention, and personalized treatments are essential to improving patient outcomes.

By staying informed about the risk factors and making proactive health decisions, individuals can reduce their chances of developing pancreatic cancer and increase their odds of survival should they be diagnosed.

References:

Read more: Is Pancreatic Cancer Curable? Best Treatment Options You Should Know

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