You will be provided with a reference and some statements. Please determine whether each statement is 'supported', 'unsupported', or 'unknown' with respect to the reference. Please note:
First, assess whether the reference contains any valid content. If the reference contains no valid information, such as a 'page not found' message, then all statements should be considered 'unknown'.
If the reference is valid, for a given statement: if the facts or data it contains can be found entirely or partially within the reference, it is considered 'supported' (data accepts rounding); if all facts and data in the statement cannot be found in the reference, it is considered 'unsupported'.

You should return the result in a JSON list format, where each item in the list contains the statement's index and the judgment result, for example:
[
    {
        "idx": 1,
        "result": "supported"
    },
    {
        "idx": 2,
        "result": "unsupported"
    }
]

Below are the reference and statements:
<reference>
Decreased Cancer Risk After Iron Reduction in... : Journal of the National Cancer Institute



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Article
Decreased Cancer Risk After Iron Reduction in Patients With Peripheral Arterial Disease: Results From a Randomized Trial
Leo

R.

Zacharski
Bruce

K.

Chow
Paula

S.

Howes
Galina

Shamayeva
John

A.

Baron
Ronald

L.

Dalman
David

J.

Malenka
C.

Keith

Ozaki
Philip

W.

Lavori
Authors and Affiliations
Journal of the National Cancer Institute

100
(
14
)
:p
996
-
1002
,
July 16, 2008
.
Abstract
Background
Excess iron has been implicated in cancer risk through increased iron-catalyzed free radical–mediated oxidative stress.
Methods
A multicenter randomized, controlled, single-blinded clinical trial (VA Cooperative Study #410) tested the hypothesis that reducing iron stores by phlebotomy would influence vascular outcomes in patients with peripheral arterial disease. Patients without a visceral malignancy in the last 5 years (n=1277) were randomly assigned to control (n=641) or iron reduction (n=636). Occurrence of new visceral malignancy and cause-specific mortality data were collected prospectively. Cancer and mortality outcomes in the two arms were compared using intent-to-treat analysis with a Cox proportional hazards regression model. Statistical tests were two-sided.
Results
Patients were followed up for an average of 4.5 years. Ferritin levels were similar in both groups at baseline but were lower in iron reduction patients than control patients across all 6-month visits (mean=79.7 ng/mL, 95% confidence interval [CI]=73.8 to 85.5 ng/mL vs 122.5 ng/mL, 95% CI=115.5 to 129.5 ng/mL;
P
< .001). Risk of new visceral malignancy was lower in the iron reduction group than in the control group (38 vs 60, hazard ratio [HR]=0.65, 95% CI=0.43 to 0.97;
P
=.036), and, among patients with new cancers, those in the iron reduction group had lower cancer-specific and all-cause mortality (HR=0.39, 95% CI=0.21 to 0.72;
P
=.003; and HR=0.49, 95% CI=0.29 to 0.83;
P
=.009, respectively) than those in the control group. Mean ferritin levels across all 6-monthly visits were similar in patients in the iron reduction and control groups who developed cancer but were lower among all patients who did not develop cancer than among those who did (76.4 ng/mL, 95% CI=71.4 to 81.4 ng/mL, vs 127.1 ng/mL, 95% CI=71.2 to 183.0 ng/mL;
P
=.017).
Conclusions
Iron reduction was associated with lower cancer risk and mortality. Further studies are needed to define the role of body iron in cancer risk.
Copyright © Copyright Oxford University Press 2008.
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</reference>

<statements>
1. This oxidative cascade drives the oxidative modification of low-density lipoproteins (oxLDL), encouraging scavenger receptor uptake by macrophages and driving foam cell accumulation
2. Concurrently, prospective substudies demonstrated a reduction in new visceral malignancies (HR 0.65, 95% CI [0.43, 0.97]) and cancer-specific mortality (HR 0.39, 95% CI [0.21, 0.72]), confirming biological effects on tissue proliferative environments despite the absence of macrovascular protection
3. Iron Depletion (Phlebotomy): Free radical generation; lipid oxidation (Fenton chemistry)
</statements>

Begin the assessment now. Output only the JSON list, without any conversational text or explanations.