Gastrointestinal Cancers

Overview

GI cancers develop when cells lining the digestive tract or associated organs grow uncontrollably.

They may invade nearby tissues or spread to distant organs such as the liver, lungs, or peritoneum.

Common GI cancers include esophageal, gastric, colorectal, pancreatic, liver, gallbladder, and biliary tract cancers.

Many GI cancers are linked to modifiable lifestyle factors and chronic infections.

Because early symptoms are often mild or absent, screening and timely evaluation are crucial.

Risk Factors

Non Modifiable

Increasing age

Male sex for several GI cancers

Family history of gastrointestinal cancers

Inherited syndromes such as Lynch syndrome and Familial Adenomatous Polyposis

Chronic inflammatory conditions such as inflammatory bowel disease or cirrhosis

Modifiable

Obesity and physical inactivity

Diet high in processed or red meat and low in fiber

Tobacco use

Heavy alcohol consumption

Poor dietary habits

Infections

Helicobacter pylori infection (stomach cancer)

Chronic Hepatitis B and C infection (liver cancer)

Certain parasitic infections affecting the liver and bile ducts

Prevention Tips

Adopt a healthy, fiber-rich diet

Maintain healthy body weight and exercise regularly

Avoid smoking and limit alcohol intake

Treat chronic infections such as H. pylori and viral hepatitis

Participate in recommended cancer screening programs

Symptoms

Early

Often no symptoms in early stages

Mild indigestion or discomfort

Common

Persistent abdominal pain or discomfort

Bloating or feeling full quickly after meals

Unintentional weight loss

Loss of appetite

Nausea or vomiting

Changes in bowel habits

Advanced

Blood in stool or black, tarry stools

Persistent vomiting or vomiting blood

Severe abdominal pain

Jaundice with yellowing of eyes or skin

Abdominal swelling due to fluid accumulation

Organ Specific

Esophagus

Difficulty swallowing

Chest pain

Regurgitation of food

Stomach

Early satiety

Upper abdominal pain

Black stools

Colorectal

Rectal bleeding

Change in stool caliber

Iron-deficiency anemia

Pancreas

Upper abdominal or back pain

New-onset diabetes

Jaundice

Liver And Biliary

Right upper abdominal pain

Itching

Dark urine and pale stools

Diagnosis

Approach

Clinical Evaluation

Detailed medical history and physical examination

Abdominal examination and assessment of nutritional status

Tests

Complete blood count

Liver and kidney function tests

Tumor markers such as CEA, CA 19-9, and AFP

Imaging

Ultrasound of abdomen

CT scan of chest, abdomen, and pelvis

MRI for liver and biliary tumors

PET-CT in selected cases

Biopsy

Endoscopic biopsy

Image-guided biopsy

Fine needle aspiration where appropriate

Endoscopic Procedures

Upper GI endoscopy

Colonoscopy or sigmoidoscopy

Endoscopic ultrasound in selected cases

Staging

TNM staging system

Assessment of lymph node and distant organ involvement

Treatment

Principle

Surgery

Esophagectomy for esophageal cancer

Gastrectomy for stomach cancer

Colectomy or rectal resection for colorectal cancer

Pancreaticoduodenectomy (Whipple procedure)

Liver resection or transplantation in selected cases

Radiation Therapy

Combined with chemotherapy for rectal and esophageal cancers

Palliative radiotherapy for bleeding or pain

Systemic Therapy

Chemotherapy before or after surgery

Targeted therapy such as HER2, EGFR, and VEGF inhibitors

Immunotherapy for selected advanced GI cancers

Supportive Care

Nutritional support and diet counseling

Pain management

Management of bowel obstruction or jaundice

Psychological and palliative care support

Do's and Don'ts

Dos

Seek early evaluation for persistent digestive symptoms

Participate in screening programs such as colonoscopy

Maintain a balanced diet and healthy weight

Adhere to treatment and follow-up schedules

Report side effects promptly

Donts

Do not ignore blood in stool or black stools

Do not self-medicate for prolonged digestive symptoms

Avoid smoking and excessive alcohol consumption

Do not stop treatment without medical advice