• There is a notable increase in appendix cancer among young adults, recent studies indicate.

  • Individuals born in the late 20th century, specifically Gen Xers and older Millennials, are at a three to four times higher risk than those born in the 1940s.

  • Appendix cancer is uncommon and lacks regular screening protocols, making it essential to consult a doctor about any persistent abdominal issues.

Recent research highlights a significant surge in appendix cancer cases among young adults.

The study, published on June 10 in the Annals of Internal Medicine, reveals that Gen Xers and Millennials are being diagnosed with appendix cancer at rates significantly higher than those seen in previous generations.

Although still very rare, with an incidence of approximately 1 or 2 cases per million each year according to the National Cancer Institute, appendix cancer is part of a larger trend of increasing early onset cancers among the youth, including colorectal cancer.

“The data showing that individuals born between the 1970s and the 1980s are about three times more likely to develop appendix cancer than those born in the 1940s were particularly surprising,” explained Andreana N. Holowatyj, PhD, MS, an assistant professor at Vanderbilt University Medical Center and Vanderbilt Ingram Cancer Center, who led the study.

“This rise in cases across various types of gastrointestinal cancers prompts us to look closely at the underlying causes of these concerning trends,” Holowatyj told Healthline.

Kiran Turaga, MD, MPH, head of surgical oncology at the Yale School of Medicine, and not involved in the study, confirmed the trend based on his clinical observations. “Just last week, I treated young patients in their late teens and early twenties for appendix cancer. It’s a real trend that we’re noticing,” he reported to Healthline.

The new findings may lead to increased awareness about this rare cancer type, especially among young adults, despite the lack of current screening or preventive measures.

Higher Rates of Appendix Cancer in Millennials and Gen X

Researchers used data from the National Cancer Institute’s Surveillance, Epidemiology, and End Results (SEER) registry to study appendix cancer rates across different generations.

They found 4,858 appendix cancer cases in individuals aged 20 and older between 1975 and 2019.

An analysis of the data showed a steady annual increase in cases since 1945, with individuals born between 1975 and 1985 experiencing three to four times the incidence rate of those born in the 1940s.

“This increase isn’t solely due to better detection methods,” Turaga emphasized. “The significant rise in numbers, combined with what we see in our clinics and understand about our patients, leads us to believe this is a genuine increase in appendix cancer cases, particularly among younger adults.”

Despite its rarity, making up less than 1% of gastrointestinal cancers, appendix cancer was historically grouped with more common colon and other GI cancers, leading to a lack of specific biological and epidemiological understanding.

Often, appendix cancer is only discovered incidentally during appendicitis surgery, when the removed appendix is examined more closely.

“In the past, appendix tumors were categorized as right-sided colon cancers. However, recent evidence over the last decade has shown that the biology of appendix tumors differs, highlighting the need for further study,” Holowatyj noted.

“Currently, because there are no FDA-approved therapies specifically for appendix cancer and due to insufficient evidence, appendix cancers are treated like right-sided colon tumors in clinical guidelines,” she added.

Factors Behind Rising Early Onset Cancer Rates

Young adults today face an increased risk for several types of cancers compared to older generations.

A study set to be published in 2024 in Lancet Public Health indicates that Millennials are at a higher risk for 17 different cancers, including:

  • breast cancer

  • uterine (endometrial) cancer

  • colorectal cancer

  • stomach cancer

  • testicular cancer

  • ovarian cancer

The exact reasons behind these trends remain uncertain, though Holowatyj suggests a combination of lifestyle and environmental factors might be contributing.

Turaga pointed out several potential environmental factors, though evidence for a direct causal relationship is currently lacking:

  • antibiotics use in humans and animals

  • gut flora imbalance (dysbiosis)

  • exposure to microplastics

  • air pollution

  • consumption of ultra-processed foods

  • increasing obesity rates

“Identifying these factors is complex, but with more research, we hope to understand which specific elements are increasing the risk, thereby enabling us to develop effective preventive strategies and reduce the overall disease burden,” Holowatyj explained.

One specific challenge with appendix cancer, as noted by Holowatyj and others, is the increasing tendency to treat appendicitis with antibiotics rather than surgery. This approach could delay the diagnosis and treatment of appendix cancer.

“If appendicitis in a patient with an unrecognized tumor is treated with antibiotics, there’s a significant risk that the cancer could progress undetected,” she cautioned.

Strategies for Preventing Appendix Cancer

Currently, there are no established screening methods for detecting appendix cancer early.

Yun Song, MD, an assistant professor of surgical oncology at MD Anderson Cancer Center who was not involved in the research, emphasized that even colonoscopies, which are the gold standard for colon cancer screenings, often miss appendix cancers.

Given the absence of reliable screening options, she urges individuals to be vigilant about potential signs and symptoms.

“I advise being attentive to symptoms like unexplained weight loss or persistent, sometimes subtle, abdominal discomfort that doesn’t resolve, and seeking medical advice promptly. In women, symptoms of appendix cancers might be mistaken for gynecological issues,” she noted.

According to the National Cancer Institute, typical symptoms of appendix cancer may include:

  • abdominal pain

  • increased abdominal size or bloating

  • a palpable mass in the abdomen

  • nausea and vomiting

  • early satiety

“While the rates of appendix cancers are climbing, it’s still a rare condition, so not all abdominal symptoms will indicate this type of cancer. However, it’s crucial to be aware of your family health history as multiple cancer cases in relatives could elevate your own risk,” Song concluded.