The Tumour Microenvironment: Stroma, Hypoxia and Immune Exclusion
A tumour is a tissue rather than a bag of cancer cells, and its stroma, blood supply and immune infiltrate change how it grows and what a drug can reach. This stop reads a tumour section as a habitat with its own gradients.
What a learner can do afterwards
- Explain how hypoxia changes gene expression and limits drug delivery inside a tumour
- Distinguish an immune-infiltrated from an immune-excluded tumour and say why the difference matters
- Argue how stromal cells can support tumour growth without carrying driver mutations themselves
1 · Read
You stop seeing a tumour as a bag of cancer cells and start seeing a tissue. Stromal partners feed and shield the mass without mutating themselves. The mass can outgrow its blood supply, leaving oxygen starved cores where drugs often arrive weakly and cells turn hardy.
You learn what low oxygen does. Hypoxia can flip master switches that grow rough vessels, invite suppressor cells, and slow division, which can blunt chemo aimed at dividing cells. Low oxygen can also blunt common radiotherapy, whose effect oxygen can enhance. It can also rewire gene programs toward survival, which is one reason the same drug can work in a dish and fail in a patient.
You compare two tumour sections. One is packed with killer cells through its core. The other holds attackers at the rim behind dense matrix and calming signals. You take the first as a clue it may respond once brakes lift, while the walled off one often shrugs; neither position guarantees the outcome.
You sort tumours into infiltrated versus excluded before you predict therapy. Infiltrated means killers already inside. Excluded means suppressor cells and matrix hold them at the rim. The neighbourhood is a strong clue, so you read the section before you trust the drug; it does not guarantee the result.
You predict dish to patient gaps from delivery. Poor vessels and dense matrix can let little drug reach starved cores, so kill curves from dishes can overstate what tissue sees.
You treat dish curves as a starting clue. Dishes lack stroma, gradients, and immune barricades, so a kill curve cannot stand in for delivery in tissue.
You read the stroma, the oxygen gradient, and the immune map as clues, because the microenvironment shapes what any drug can reach.
Original readings written in-repo; academy video links retained with unknown terms.
2 · Watch
En anglaisTake it off screen
Where it sits
Optional connections
This opens up
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.