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Major Diseases — the big four of chronic illness

Cardiovascular disease — ischemic heart disease, stroke, hypertensive complications — claims roughly 17 million lives every year, more than any...

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Cardiovascular disease — ischemic heart disease, stroke, hypertensive complications — claims roughly 17 million lives every year, more than any other cause of death worldwide. Key sections include: MAJOR DISEASES.; The #1 killer on the planet.; How a vessel fails.; When cells forget to stop dividing.; The six hallmarks of cancer.; Five sites, most deaths.; The metabolic epidemic.; The slow unraveling of a mind.; A circuit loses its dopamine.; One root, many trees..

Key sections

01MAJOR DISEASES.
02The #1 killer on the planet.
03How a vessel fails.
04When cells forget to stop dividing.
05The six hallmarks of cancer.
06Five sites, most deaths.
07The metabolic epidemic.
08The slow unraveling of a mind.
09A circuit loses its dopamine.
10One root, many trees.
11What you do every day.
12A different medicine than ten years ago.
13Read more, watch more.

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catalog health diseases

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Slide outline

01MAJOR DISEASES.
02The #1 killer on the planet.
03How a vessel fails.
04When cells forget to stop dividing.
05The six hallmarks of cancer.
06Five sites, most deaths.
07The metabolic epidemic.
08The slow unraveling of a mind.
09A circuit loses its dopamine.
10One root, many trees.
11What you do every day.
12A different medicine than ten years ago.
13Read more, watch more.

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Slide 01

MAJOR DISEASES.

A clinical primer · 13 slides
The big four of chronic illness — cardiovascular, cancer, diabetes, and the neurodegenerative spectrum.
~41M NCD deaths/yr
74% global mortality
4 dominant categories

Slide 02

The #1 killer on the planet.

Slide 02 · Cardiovascular
Cardiovascular disease — ischemic heart disease, stroke, hypertensive complications — claims roughly 17 million lives every year, more than any other cause of death worldwide.
Annual deaths
17.9M
~32% of all global deaths (WHO)
Heart attacks /yr
~7.4M
Coronary occlusion events
Strokes /yr
~6.2M
Ischemic + hemorrhagic combined
Preventable
~80%
With diet, BP, cholesterol control
The mechanism is mechanical. A narrowed coronary artery starves myocardium of oxygen. A burst plaque triggers a clot. A weakened vessel ruptures. The heart, an electrical-mechanical organ that beats two and a half billion times in a lifetime, has remarkably little tolerance for sustained ischemia.
The risk profile is well-mapped. Hypertension, LDL cholesterol, smoking, diabetes, obesity, family history — the Framingham generation gave us decades of follow-up that turned cardiology into a numbers game. Statins, antihypertensives, and aspirin reshaped survival curves.
FIG. 02 · Cardiac silhouette17M /yr

Slide 03

How a vessel fails.

Slide 03 · Atherosclerosis
Cholesterol-rich plaques accumulate within arterial walls over decades. Slowly they narrow the lumen; suddenly they rupture, exposing thrombogenic material to circulating blood and triggering catastrophic clots.
1Endothelial injury. Hypertension, smoking, oxidized LDL, and high glucose damage the artery's inner lining.
2Lipid retention. LDL particles slip beneath the endothelium and oxidize, attracting macrophages.
3Foam cells form. Macrophages gorge on oxidized LDL, becoming bloated foam cells — the seed of every plaque.
4Fibrous cap matures. Smooth-muscle cells encase the lesion. Some plaques stay stable for decades.
5Cap ruptures. An unstable plaque tears. Platelets aggregate. A clot forms in seconds. The downstream tissue dies.
FIG. 03 · Cross-section, healthy vs diseasedPLAQUE

Slide 04

When cells forget to stop dividing.

Slide 04 · Cancer
Cancer is not one disease but a family of disorders unified by a single principle: the loss of tight cellular self-governance. Mutations accumulate, brakes fail, and a clone of cells expands without restraint.
Annual deaths
~10M
2nd leading cause globally
New cases /yr
~20M
Incidence still rising worldwide
Distinct types
200+
By tissue of origin & mutation
5-yr survival
~70%
All sites combined, US, 2020s
It is fundamentally a genetic disease. Driver mutations in oncogenes and tumor suppressors — KRAS, TP53, MYC, RB — accumulate across years of replication errors, environmental damage, and inherited risk. Most cancers require five to ten such hits to fully transform.
Hanahan and Weinberg, 2000. Two cancer biologists synthesized decades of fragmented findings into a unifying framework: every cancer, regardless of origin, must acquire a small set of biological capabilities. These — the "Hallmarks of Cancer" — became the field's organizing schema.
FIG. 04 · Cell division — from one to manyMITOSIS

Slide 05

The six hallmarks of cancer.

Slide 05 · Hanahan & Weinberg
A 2000 paper, then a 2011 update, distilled the entire malignant repertoire into a small set of acquired capabilities. Every tumor — breast, brain, blood — must check most of these boxes.
Sustaining proliferative signaling
Tumors generate or mimic their own growth signals, hijacking pathways like RAS-MAPK to keep dividing.
Evading growth suppressors
Tumor suppressors like TP53 and RB get knocked out, dismantling the cell-cycle brakes.
Resisting cell death
Apoptosis — the programmed self-destruct — gets disabled. Damaged cells refuse to die.
Replicative immortality
Telomerase reactivation lets cells dodge the Hayflick limit and divide indefinitely.
Inducing angiogenesis
Tumors recruit new blood vessels (via VEGF) to feed their growing mass with oxygen and nutrients.
Invasion & metastasis
Cells lose adhesion, breach basement membranes, and seed distant organs — the deadliest hallmark.

Slide 06

Five sites, most deaths.

Slide 06 · The major cancers
Cancer is many diseases, but mortality concentrates in a handful of organs. Lung leads by a wide margin, driven historically by smoking; pancreatic remains the deadliest by 5-year survival.
Lung
1.8M
Colorectal
935K
Liver
830K
Stomach
770K
Breast
685K
Pancreatic
466K
Prostate
375K
Annual deaths by primary site, GLOBOCAN-style estimates. Lung cancer alone accounts for nearly one in five cancer deaths. Pancreatic cancer's five-year survival hovers near 13%, the lowest of common solid tumors.

Slide 07

The metabolic epidemic.

Slide 07 · Type 2 Diabetes
Roughly 530 million adults live with diabetes, the vast majority Type 2. The body's tissues stop responding to insulin; the pancreas overcompensates; eventually it fails. Glucose climbs and quietly damages every vessel it touches.
537M
Adults living with diabetes
~10.5% of the global adult population (IDF, 2021); ~90% Type 2.
1 in 2
Undiagnosed
Half of cases worldwide remain unknown until complications surface.
~7%
Lifetime weight loss target
Modest reductions can reverse early Type 2 in many patients.
The mechanism is exhaustion. Persistent excess calories — especially refined carbohydrates — force the pancreas to pump insulin year after year. Muscle, liver, and fat cells eventually stop listening. Beta cells, the insulin factories of the pancreas, burn out.
Metabolic syndrome bundles diabetes' usual companions: central obesity, hypertension, dyslipidemia, fatty liver. The same biology that causes diabetes accelerates atherosclerosis, kidney failure, and certain cancers.
The therapeutic landscape transformed. Metformin remains foundation; SGLT2 inhibitors protect kidneys and hearts; GLP-1 agonists like semaglutide drive weight loss and glycemic control simultaneously, blurring the line between diabetes and obesity treatment.

Slide 08

The slow unraveling of a mind.

Slide 08 · Alzheimer’s disease
Roughly 55 million people worldwide live with dementia, the majority due to Alzheimer's. Decades before symptoms appear, two pathological proteins begin accumulating: amyloid-beta plaques between neurons, and tau tangles within them.
The amyloid hypothesis. Misfolded amyloid-beta peptides aggregate into extracellular plaques. These plaques disrupt synaptic function and trigger downstream neurodegeneration. Tau, a normally helpful microtubule-stabilizing protein, becomes hyperphosphorylated and forms tangles inside dying neurons.
The new monoclonals. Lecanemab and donanemab — antibodies that clear amyloid — modestly slow decline in early disease. They are not cures, but they validate the amyloid pathway and mark the first disease-modifying therapies after decades of failure.
Risk is not destiny. APOE4 carriers face elevated risk; midlife hypertension, hearing loss, social isolation, and untreated diabetes also push the curve. Dementia is increasingly understood as the brain's expression of lifelong vascular and metabolic health.
FIG. 08 · Brain cross-section55M /yr

Slide 09

A circuit loses its dopamine.

Slide 09 · Parkinson’s disease
Parkinson's is a focal neurodegeneration: dopaminergic neurons in the substantia nigra die off, gradually depleting the basal ganglia of dopamine. Movement becomes slow, stiff, and tremulous; balance, voice, and mood are pulled along with it.
1Substantia nigra degenerates. Pigmented dopaminergic neurons die, often with intracellular alpha-synuclein aggregates called Lewy bodies.
2Basal ganglia circuits unbalance. Loss of dopaminergic input disrupts motor planning — movement initiation falters.
3Cardinal symptoms emerge. Resting tremor, bradykinesia, rigidity, postural instability — usually after ~70-80% of dopaminergic neurons are already gone.
4Levodopa replaces what's lost. The dopamine precursor crosses the blood-brain barrier and is converted by surviving neurons. It works for years, sometimes decades.
5Deep brain stimulation. When medication wears off, electrodes implanted in the subthalamic nucleus modulate the malfunctioning circuit directly.
~10M
Living with Parkinson's globally
Second most common neurodegenerative disease after Alzheimer's.
60+
Typical age of onset
Risk doubles every five years past 60. Early-onset cases (under 50) are roughly 5-10%.
DBS
Deep brain stimulation
Implanted electrodes in the STN deliver high-frequency current; a remarkable engineering answer to circuit-level disease.

Slide 10

One root, many trees.

Slide 10 · Shared biology
The big four look like distinct diseases at the symptom level, but at the molecular level they share startling overlap. Three pathological themes appear again and again across cardiovascular, oncologic, metabolic, and neurodegenerative pathology.
Chronic inflammation
Low-grade smoldering immune activation damages vessels, primes tumors, kills neurons, and drives insulin resistance.
Insulin resistance
The hallmark of metabolic dysfunction also accelerates atherosclerosis, certain cancers, and accelerated cognitive decline.
Mitochondrial dysfunction
Failing cellular powerplants produce ROS, reduce ATP, and underlie aging itself — a substrate for nearly every chronic disease.
Cellular senescence
Aged cells stop dividing but refuse to die, secreting inflammatory signals (SASP) that poison surrounding tissue. A current frontier of therapy.
This convergence is why a single intervention — exercise, caloric restriction, certain drugs — can move the needle on multiple seemingly unrelated diseases. The body has fewer fundamental failure modes than the diagnostic codes suggest.

Slide 11

What you do every day.

Slide 11 · The four levers
No drug rivals the cumulative effect of basic lifestyle choices. Across all four chronic disease categories, the same four levers move risk dramatically — in the same direction.
-30%
Diet quality
Mediterranean-style eating — vegetables, legumes, whole grains, fish, olive oil — cuts cardiovascular events and certain cancers.
-35%
Exercise
150 minutes of moderate activity weekly reduces all-cause mortality. Strength training adds independent benefits for diabetes and bone health.
7-9h
Sleep
Sleep deprivation impairs glucose tolerance, drives inflammation, and accelerates cognitive decline. Quality matters as much as duration.
-25%
Stress & social
Chronic stress and social isolation independently raise cardiovascular and dementia risk. Connection is medical.
The headline finding from large cohorts: people who hit several lifestyle targets simultaneously — not smoking, healthy weight, regular exercise, decent diet — have roughly half the chronic disease incidence of those who hit none. The signal survives every adjustment.
It compounds across decades. Metabolic damage in your 30s shows up as insulin resistance in your 50s and dementia in your 70s. The interventions are unglamorous, but they are the dominant variable in healthspan.

Slide 12

A different medicine than ten years ago.

Slide 12 · The therapeutic frontier
In each of the big four, the toolkit has been transformed within a single decade. Drugs that target underlying biology — not just symptoms — have moved survival curves more in five years than the previous fifty.
GLP-1
Glucagon-like peptide receptor agonists
Semaglutide, tirzepatide. Once weekly injection. 15-25% weight loss, robust glycemic control, growing cardiovascular and renal evidence. Already reshaping obesity, diabetes, and likely Alzheimer's risk.
STAT
Statins & PCSK9 inhibitors
The cholesterol revolution that reduced cardiovascular mortality by ~30%. PCSK9 monoclonals push LDL to historically low levels with minimal side effects.
Cancer immunotherapy
Checkpoint inhibitors (pembrolizumab, nivolumab) and CAR-T cell therapies have produced durable remissions in tumors that were death sentences a decade ago. Melanoma, lung, lymphoma transformed.
GENE
Gene therapy & editing
CRISPR-based therapies for sickle cell (Casgevy, 2023) prove the platform. AAV delivery is curing inherited blindness and SMA. Whole categories of monogenic disease are becoming addressable.

Slide 13