Selected angle: boundary_condition

One-sentence thesis

approximately 40% of dementia cases worldwide could be attributable to 12 modifiable risk factors. Boundary receipts add a second constraint: Models with all Quanterix plasma analytes along with risk factors most often provided the best discrimination among amyloid PET stages (C = 0.78-0.82).

Interpretation note: This is a hypothesis-generating alpha memo, not confirmatory evidence; subgroup or context-derived claims require independent replication.

Why this is surprising

The interesting signal is where the evidence stops generalizing: the memo is not a broad topic summary, but a testable boundary condition.

Evidence Landscape

Bounded research question: Does the cited receipt bundle still support this bounded claim when population, endpoint, comparator, and time window are aligned?

Evidence receipts

• fact_id=142261 (A_core) — approximately 40% of dementia cases worldwide could be attributable to 12 modifiable risk factors doi=10.1111/joim.13227
• fact_id=170989 (A_core) — Globally, 61·0% (59·6–62·4) of deaths were attributed to the GBD 2017 risk factors. doi=10.1016/s0140-6736(19)31429-1
• fact_id=177576 (A_core) — up to 90% of strokes might be prevented by addressing and treating ten modifiable stroke risk factors, half of which are related to lifestyle modifications. doi=10.3390/medicina60030504
• fact_id=93195 (A_core) — 45.1% of cancer deaths (265,150 of 587,521 deaths) were attributable to evaluated risk factors. doi=10.3322/caac.21440
• fact_id=93194 (A_core) — an estimated 42.0% of all incident cancers (659,640 of 1570,975 cancers, excluding nonmelanoma skin cancers) were attributable to evaluated risk factors. doi=10.3322/caac.21440
• fact_id=98930 (A_core) — Prevalence of SCD increased from 3.9% among adults with no risk factors to 25.0% among those with four or more risk factors. doi=10.15585/mmwr.mm7120a2

Context receipts

Boundary evidence only; these receipts broaden source context but do not independently prove the lead claim.

• fact_id=143088 (B_context) — Models with all Quanterix plasma analytes along with risk factors most often provided the best discrimination among amyloid PET stages (C = 0.78-0.82) doi=10.1093/brain/awad042
• fact_id=143092 (B_context) — Lilly p-tau217 did not improve over a model with all Quanterix plasma analytes and risk factors (C = 0.85 versus 0.83) doi=10.1093/brain/awad042

What this changes

Treat this as a focused working signal, not a broad topic claim. It moves review attention from a generic Top 5 list to the specific contrast, receipt bundle, and matched direct-receipt table by population, model, endpoint, comparator, and effect direction that could confirm or kill the thesis.

Limitations

• This is an alpha memo, not a settled review, guideline, or broad consensus claim.
• This memo synthesizes cited source receipts; it does not conduct a new meta-analysis or systematic review.
• Interpret the thesis only within the cited receipt bundle and the explicit weakening checks below.
• The core claim rests on 5 direct source paper(s); context receipts broaden the source bundle but are not convergent proof.
• Independent receipts fail to reproduce the claimed contrast.
• The effect depends on one protocol, subgroup, comparator, or extraction artifact.

What would weaken this

• Independent receipts fail to reproduce the claimed contrast.
• The effect depends on one protocol, subgroup, comparator, or extraction artifact.

Strongest counter-evidence

• fact_id=143092 (B_context) — Lilly p-tau217 did not improve over a model with all Quanterix plasma analytes and risk factors (C = 0.85 versus 0.83) Source: Predicting amyloid PET and tau PET stages with plasma biomarkers

Next extraction

• Extract independent A_core/B_context receipts that test the lead contrast directly.
• Audit whether each direct receipt remains comparable on population, endpoint, comparator, and measurement method.
• Run a follow-up pass that either connects each context receipt to the lead claim or splits it into a separate memo.