What Are The Hallmarks Of Cancer?
Cancer cells differ from normal cells in several fundamental ways. Researchers have identified specific traits, known as "hallmarks", that cancer cells acquire to grow and spread. Understanding these hallmarks helps scientists and doctors comprehend how cancer develop and find better ways to treat them.
The 8 Core Hallmarks of Cancer
Constant Growth Signals
Cancer cells keep sending themselves messages to grow and divide – like a plant with a broken growth signal that keeps shooting out new leaves and vines, ignoring the season or soil conditions.
Ignoring Stop Signals
Normally, cells get signals telling them to slow down or stop growing. Cancer cells ignore these messages – like a vine that grows over a trellis, then keeps spreading uncontrollably even when space runs out.
Evading Cell Death
When damaged, normal cells undergo programmed death. Cancer cells avoid this process, allowing them to survive longer than they should – like plants that are never pruned and take over entire sections of the garden.
Limitless Replication
While normal cells can only divide a certain number of times, cancer cells can replicate indefinitely – like perennial weeds that keep coming back no matter how many times they’re cut down.
Inducing New Blood Vessels (Angiogenesis)
Tumors stimulate the formation of new blood vessels to supply themselves with nutrients and oxygen – like an aggressive root system drawing in water and nutrients to feed unchecked growth.
Activating Invasion and Metastasis
Cancer cells can invade nearby tissues and spread to other parts of the body – just as ivy sends out runners, reaching into cracks and climbing up other trees and walls.
Reprogramming Energy Use
They alter their energy production methods to support rapid growth – like redirecting all the garden’s resources to one wild, fast-growing patch at the expense of the rest.
Evading the Immune System
Cancer cells can hide from or suppress the body's immune responses that would typically eliminate abnormal cells – like camouflage weeds blending into the garden, escaping notice until they have taken root.
Additional Factors Supporting Cancer Development
Genetic Instability
Cancer cells often have mutations that make their DNA more prone to errors, leading to further abnormalities.
Tumor-Promoting Inflammation
Chronic inflammation can create an environment that
supports tumor growth.
Tumor Microenvironment
Cancer cells interact with surrounding normal cells, which
can aid in their growth and survival.
From Understanding to Action:
How Knowledge Becomes Prevention
When we begin to understand the hallmarks of cancer, something starts to feel a little less uncertain. What once seemed random begins to follow patterns – like changes in a garden that, once recognised, start to make sense.
The hallmarks show us how cells shift their behaviour over time. They reveal how the balance in our internal “garden” can change – how certain conditions allow some cells to grow, survive, and spread in ways they shouldn’t.
And this naturally leads to an important question: if we understand these patterns, can we influence the conditions in which they arise?
This is where prevention comes in.
Prevention is not about creating a perfect garden or controlling every single factor. Some seeds arrive without invitation, and some conditions are beyond our control. But there are also ways to care for the soil, to support what keeps the system in balance, and to recognise early signs of change.
In the next post, we’ll explore what prevention really means in the context of cancer – and how small, informed steps can help you care for your “garden” in a way that feels realistic, supportive, and empowering.
Want to dig deeper?
If you’d like to understand terms like tumour, benign, or metastasis more clearly, you’ll soon find more dedicated articles here on the blog — each one breaking down a single concept in a simple, visual way.
If you want the whole structured journey, where everything connects step by step, you can also explore my book How to Speak Cancer.
It brings these topics together step by step and supports you in navigating the language of cancer at your own pace. Along the way, you will also find additional support, including links to patient organisations, glossaries of cancer and clinical trial terms, and a notes section where you can write down your own thoughts, questions, and key points to help you prepare for your next appointment with your healthcare team.