Role of Angiogenesis in Cancer: What You Need to Know

Your body grows when needed, heals when hurt, and then returns to balance. This sense of normalcy gives us a deep, often unnoticed feeling of safety.

Processes that once protected you can begin to behave differently. One of those is angiogenesis, a natural function your body uses for healing, but one that cancer can take control of.

That feeling is valid, and this guide is here to answer what angiogenesis is, how angiogenesis works, what causes angiogenesis, and how modern treatments try to manage it.

What is angiogenesis?

Angiogenesis is how your body creates new blood vessels from the ones that already exist. Your body uses it when you heal from a wound, recover from injury, or even during normal cycles like tissue repair.

Angiogenesis meaning is that your body builds new pathways so blood can reach places that need support.

In a healthy situation, angiogenesis is:

• •Carefully controlled
• •Short-term
• •Helpful

In cancer, this same process is no longer controlled.

• •Build their own blood supply
• •Grow faster
• •Survive longer

This is what we often refer to as angiogenesis cancer, when a normal healing process is used to support something harmful.

2 main types of angiogenesis

Your body actually has more than one way to form new blood vessels. These different types of angiogenesis support both healthy tissues and tumours.

Let’s walk through the two main ones:

1. Sprouting angiogenesis

This type of angiogenesis is often active in cancerous conditions. Tumours release strong signals that encourage continuous sprouting, helping them expand their blood supply quickly.

Here’s how it works:

• •A signal is sent (often due to low oxygen)
• •Cells from an existing blood vessel begin to grow outward
• •These cells “sprout” toward the area that needs blood

2. Intussusceptive (splitting) angiogenesis

This type of angiogenesis is a bit different and surprisingly efficient.

Instead of growing outward, an existing blood vessel splits into two from within. This process uses less energy and allows rapid adaptation, making it important for tumour growth.

Because tumours can switch between different angiogenesis methods when one is blocked, this flexibility makes angiogenesis cancer challenging to treat.

The angiogenesis process: 5 steps of how new blood vessels form

Here are the angiogenesis steps:

Step 1: The body sends a signal

Among the stages of angiogenesis, the most important is low oxygen or hypoxia. When cells don’t get enough oxygen, they send out a distress signal. As tumours grow very fast, they quickly run out of oxygen. This keeps the signal turned on all the time.

Loss of the p53 tumour suppressor gene further reduces inhibitors.

Step 2: Blood vessel cells wake up

Your body uses VEGF and other chemicals to control the growth of new blood vessels. In cancer, these signals are produced in large amounts. In a healthy body, this happens only when needed. But in cancer, those signals don’t stop, and your body keeps on creating new blood vessels.

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Step 3: Clearing the path

Before new blood vessels can grow, space needs to be created. So your body releases special enzymes that break down nearby structures and clear a path for new cells to move. This can make the surrounding tissues inflamed, acidic, and stressed.

Step 4: Forming a new tube

As the cells continue growing, they organise themselves into a hollow tube called the lumen. This tube will soon carry blood, bringing oxygen and nutrients to both healthy and malignant cells.

Step 5: Strengthening the vessel

The cells form tight connections with each other using proteins like VE-cadherin, making the tube stay intact and not fall apart.

In healthy angiogenesis, this step creates smooth and well-organised vessels. But in cancer, the tubes are often irregular, and the walls can be leaky. Still, it’s enough for the tumour to grow.

Role of angiogenesis in cancer growth

• •Tumour-driven angiogenesis forms weak, leaky vessels that allow cancer cells to enter the bloodstream (intravasation).
• •Higher angiogenesis increases metastasis and is linked to poorer survival in cancers like breast, lung, and colorectal.
• •The tumour environment becomes low in oxygen and acidic, pushing cancer cells to become more aggressive.
• •Irregular blood flow means some tumour areas receive less chemotherapy, reducing treatment effectiveness.

This is why cancer cells angiogenesis is such an important focus in modern research.

Angiogenesis and cancer treatment

Once oncologists were sure about tumours building their own blood supply, the approach changed to stopping it from doing so.

Anti-angiogenesis therapy

Anti-angiogenesis therapy focuses on blocking the signals, mainly VEGF, that tell the body to form new blood vessels.

These therapies work by:

• •Blocking VEGF directly
• •Preventing it from attaching to its receptors
• •Stopping the chain reaction that leads to new blood vessel growth

When this happens, angiogenesis slows down or stops.

Some commonly used drugs include:

Benefits and limitations of anti-angiogenic treatments

While anti-angiogenic treatments are effective, they’re not without drawbacks. Here are the benefits and limitations discussed:

What this means for you

While cancer may use angiogenesis to its advantage, treatments today are designed to slow this process and support better outcomes. Ongoing research continues to bring more hope with targeted and effective approaches.