Why Is Endoscopy Needed Before Bevacizumab for HCC?

You may need an upper endoscopy before starting a specific first-line treatment for liver cancer (the combination of atezolizumab and bevacizumab) because of a risk of bleeding ^[1]. While atezolizumab is an immunotherapy, bevacizumab is a targeted medication that can impair blood vessel repair ^[2]. Hepatocellular carcinoma (HCC) often occurs alongside liver scarring (cirrhosis), which can cause enlarged, fragile veins in your digestive tract called varices ^[3].

The upper endoscopy—often recommended within six months before starting this regimen—is a vital safety check. It allows your medical team to find and potentially treat high-risk veins, which helps reduce the chance of severe internal bleeding during your cancer treatment ^[4][5].

🚨 Warning Signs of Internal Bleeding
Gastrointestinal bleeding can be a life-threatening emergency. Seek immediate emergency medical care (call 911 or go to the nearest emergency room) if you experience:

• Vomiting blood or material that looks like coffee grounds
• Black, tarry, or bloody stools
• Fainting, severe dizziness, or unusual weakness
• Confusion or shortness of breath

The Connection Between Liver Cancer and Fragile Veins

The liver acts as a vital filter for blood. When the liver is scarred from cirrhosis, blood cannot flow through it easily. This resistance causes blood pressure to build up in the major vein that brings blood to the liver—a condition known as portal hypertension ^[1].

To bypass the blockage, blood finds alternative routes through smaller veins, especially those in the lower esophagus (the swallowing tube) and stomach. Because these small veins are not built to handle high blood pressure, they can stretch and become fragile ^[3]. These enlarged veins are known as gastroesophageal varices.

Why Bevacizumab Increases Bleeding Risk

Atezolizumab plus bevacizumab is a recommended first-line option for selected patients with advanced HCC ^[6]. While atezolizumab helps your immune system attack the cancer, bevacizumab works by blocking VEGF, a protein that tumors use to grow new blood vessels ^[1][2].

However, blocking VEGF also impairs your body’s normal ability to repair blood vessels and heal wounds. Because of this, bevacizumab increases the risk of serious bleeding ^[1][2]. If an untreated, high-risk varix in your esophagus were to bleed while you were taking bevacizumab, the hemorrhage could be severe and difficult to stop ^[3].

Screening and Securing the Veins

Because this risk is serious, clinical guidelines and protocols frequently recommend that patients undergo an upper endoscopy (an EGD) before starting a bevacizumab-containing regimen, unless they have had a recent qualifying exam ^[4][5].

During this brief procedure, a doctor passes a small, flexible camera down your throat while you are sedated to look for varices. The findings dictate what happens next:

• Observation: If no varices or only low-risk varices are found, no immediate treatment may be needed, and you may be cleared to start cancer therapy.
• Variceal Banding (Ligation): If high-risk esophageal varices are found, the doctor can place tiny rubber bands around them to close them off ^[4]. This helps reduce the risk of bleeding, though it does not eliminate it entirely.
• Medication: Depending on the type and size of the varices, your doctor might prescribe a daily medication (like a nonselective beta-blocker) to lower the blood pressure in your digestive veins ^[7]. This can be used instead of, or alongside, banding.

If you require banding, you will likely need to wait before starting bevacizumab. Medical teams often wait at least a couple of weeks for the post-banding ulcers to heal completely, and they may require a repeat endoscopy to ensure the varices are fully secured before you receive your first cancer infusion. If bevacizumab is deemed too risky due to varices, your oncology team will discuss alternative effective treatments for your liver cancer.

Note on Medications: Do not stop or restart any prescribed blood thinners or daily aspirin on your own. Always consult with your prescribing doctor and endoscopy team for individualized instructions.