Digestive system cancers: stomach, esophagus, pancreas, and liver

What it is

Although each one is a different disease, they share something important: in early stages they tend to cause vague discomfort that is easily confused with common problems such as gastritis, heartburn, or indigestion. That is why many people spend months self-treating before receiving a diagnosis. A digestive complaint that does not improve with the usual treatment, or that lasts for weeks, deserves to be studied (U.S. National Cancer Institute; NCI — pancreatic cancer).

Together, these cancers account for a significant share of malignant tumors in Mexico, and several of them are linked to factors we can actually address: treatable infections (such as the Helicobacter pylori bacteria in the stomach or the hepatitis B and C viruses in the liver), tobacco, alcohol, and obesity.

Risk factors

• Stomach: untreated Helicobacter pylori infection, a diet very high in salt, smoked foods and cold cuts, smoking, family history.
• Esophagus: chronic gastroesophageal reflux (frequent heartburn for years) and its complication called Barrett's esophagus, smoking, alcohol use, obesity.
• Pancreas: smoking, long-standing diabetes, obesity, chronic pancreatitis, family history.
• Liver: chronic hepatitis B or C infection, cirrhosis (from alcohol or fatty liver), obesity and diabetes, excessive alcohol use.
• Common to the whole group: age over 50, smoking, alcohol, obesity.

Sources: NCI — stomach, NCI — esophagus, NCI — pancreas, NCI — liver.

Warning signs / common symptoms

• Pain or discomfort in the upper abdomen (the "pit of the stomach") that does not improve.
• Persistent heartburn or indigestion, or symptoms that keep coming back despite treatment.
• Difficulty or pain when swallowing food (the feeling that food "gets stuck").
• Feeling full very quickly when eating, or loss of appetite.
• Frequent nausea or vomiting; vomiting blood or having black stools.
• Unintended weight loss.
• Yellowing of the skin or eyes (jaundice), dark urine.
• Marked tiredness or anemia with no apparent cause.
• Swelling of the abdomen or a lump you can feel.

Important: the great majority of the time, these complaints come from common, treatable conditions such as gastritis, reflux, or gallstones. No single symptom by itself indicates cancer, and only a doctor can evaluate it. If a digestive complaint persists for weeks or comes with weight loss, come in for an evaluation.

Source: American Cancer Society in Spanish — stomach cancer, signs.

How it is detected and diagnosed

• Evaluation appointment: the starting point. The oncologist reviews your history (symptoms, how long they have lasted, background, habits) and examines you.
• Laboratory tests: blood tests that check for anemia, liver and pancreas function, and tumor markers when indicated.
• Endoscopy: for the stomach and esophagus, the key test is an endoscopy (a thin camera that examines the digestive tract from the inside), which also allows samples to be taken directly.
• Imaging tests: ultrasound, CT scan, or other studies to evaluate the liver, the pancreas, and the extent of any lesion.
• Biopsy: a definitive diagnosis is made by analyzing a tissue sample. Depending on the organ, the sample is taken by endoscopy or by image-guided needle puncture.

At the Unidad de Oncología Menonita you can have the evaluation appointment, the tests, and the biopsies needed to reach a precise diagnosis, with coordination of any complementary studies your case requires.

Treatment options

Each of these cancers is treated differently, and within each type the plan depends on the stage, the location, and the patient's overall health. That is why the first step is always a complete evaluation.

What the unit offers:

• Cancer surgery: in several of these tumors (stomach, and selected cases of esophagus, pancreas, and liver), surgery is a central part of treatment when the disease is caught in time.
• Chemotherapy: a primary tool in treating digestive cancers, before or after surgery, or as the main treatment in advanced stages.
• Targeted therapy: some digestive tumors have specific features (for example, certain stomach or liver cancers) that allow the use of targeted medicines.
• Immunotherapy: in selected cases of stomach, esophageal, and liver cancer, depending on the tumor's profile.
• Palliative care: pain control, nutritional support, and symptom management to protect quality of life at any stage; in these cancers, this kind of support is especially valuable.

What we say honestly: in several scenarios — for example, certain cases of esophageal or stomach cancer — optimal treatment includes radiation therapy, and some liver or pancreas cases require highly specialized procedures performed at more complex centers. The unit does not have radiation therapy; when your case requires it, we refer you to centers in Chihuahua City and continue coordinating the rest of your treatment and your follow-up here, close to home.

Source for treatment options: NCI — stomach cancer treatment.

Early detection / prevention

For this group of cancers there are no population-wide screening programs like those for colon or prostate cancer, so the key is to address the risk factors and not ignore persistent symptoms:

• Treat Helicobacter pylori infection when it is found: it is a known factor in stomach cancer and is treated with medication (NCI — H. pylori and cancer).
• Get tested for and treat hepatitis B and C: there are tests, a vaccine (hepatitis B), and treatments; in people with cirrhosis or chronic hepatitis, the doctor may order periodic monitoring of the liver with ultrasound.
• Do not normalize reflux: if you have had frequent heartburn for years, mention it in consultation; in indicated cases, an endoscopy makes it possible to monitor the esophagus.
• Avoid tobacco and moderate alcohol: both weigh on all four cancer types in this group.
• Watch your weight and your diabetes: obesity and poorly controlled diabetes are associated with pancreatic and liver cancer.
• If digestive symptoms do not let up in 3–4 weeks, or if there are signs such as jaundice, vomiting blood, black stools, or weight loss, come in for an evaluation without waiting any longer.

Frequently asked questions

I have had gastritis for years — does it turn into cancer? Common gastritis does not usually turn into cancer, but some of its causes — such as Helicobacter pylori infection — do increase the risk over the years if left untreated. It is worth studying and treating it instead of just taking medicine for the symptom. Come in for an evaluation.

Why is pancreatic cancer detected so late? Because the pancreas sits deep in the abdomen and its tumors cause almost no discomfort at first; by the time symptoms such as jaundice or pain appear, the disease has usually grown. That is why it is important to address the risk factors (tobacco, diabetes, obesity) and study persistent symptoms without delay.

I was told I have fatty liver — am I at risk of cancer? Fatty liver is very common, and in most people it never leads to cancer. However, when it progresses to chronic inflammation or cirrhosis, the risk of liver cancer increases. Medical follow-up and lifestyle changes (weight, alcohol, diabetes control) help prevent that progression.

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