Every pathway class
Cancer Claim Clinic
You have already heard things about cancer, from family, from a phone, from a show. Some of it is right, some of it is half right, and some of it is wrong in ways that hurt people. This is forty minutes on how to tell which is which.
Read this first
This lesson is about how to judge a claim. It is not medical advice, and it is not a guide to anyone's diagnosis or treatment. Questions about a real person's care belong with that person's clinician. Some of you have cancer in your family. You can write your reflection instead of saying it out loud, and you can step out at any point without explaining why.
What you should leave with
Cancer begins when cells lose normal control of growth, survival, repair, movement, or tissue relationships. Risk is not destiny. A treatment is chosen for a mechanism, a location, and a patient's own situation. Evidence sets the limit of every claim.
2. Reduce
Four parts, and that is the whole model
Almost every claim you will hear about cancer is really a claim about one of these four. Naming which one is most of the work.
1. Control
Growth, checkpoints, repair, and programmed cell death. A normal cell divides when signals say to, stops at a checkpoint when something is wrong, repairs its DNA, and dies on cue. Cancer is what happens when those brakes fail and the go-signals get stuck on.
2. Place
Tissue boundaries, invasion, circulation, and distant sites. Normal cells stay where they belong. Crossing a boundary is invasion. Reaching a distant organ and growing there is metastasis. Those are separate claims and they need separate evidence. Stage is how far a cancer has spread: still in one place, into nearby lymph nodes, or to a distant organ. Stage is the single biggest thing that changes what treatment is possible.
3. Variation
Cancers differ from each other, and cells differ inside one tumor. That second kind of variation is the one people miss, and it is why a treatment can work for months and then stop.
4. Treatment
Mechanism, target, location, tradeoff, and resistance. Every treatment is chosen to do something specific to a specific feature, and every one costs the patient something. Resistance is selection acting on the variation that was already there.
1. Notice
Sort the claims
You have heard most of these. Put each one where you think it belongs, then commit. You are not being graded on this, and you will get a chance to change your mind.
- Supported.
- The evidence backs the claim as it is worded.
- Partly supported but overstated.
- A real relationship exists, but the claim exaggerates how big or how certain it is. Look for words like usually, always, or cures.
- Unsupported.
- The evidence contradicts the claim as worded. A claim that joins a true part to a false part goes here, because the whole statement is false.
- Not enough evidence.
- The research cannot answer it yet, either way. This is different from being wrong.
Take it back to your class
One question per course
PBT
Which test would distinguish a correlation from a mechanism?
HAP
Which structure or system is affected by the claim?
GEND
Which biomarker or test would change a treatment decision?
BFH
What control, model, or ethical gate is required?
Where this comes from
The evidence in this lesson comes from the National Cancer Institute, part of the National Institutes of Health. Everything you need is on this page. These links are there if you want to read further.
Go Hornets.