South Carolina Statewide Cancer Prevention & Control Program

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Presentation transcript:

South Carolina Statewide Cancer Prevention & Control Program Breast Cancer Survival Analysis among Economically Disadvantaged Women: The Influences of Delayed Diagnosis and Treatment on Mortality Emily Smith, MSPH Swann Arp Adams, Ph.D. Irene Prabhu-Das, Ph.D. James R. Hebert, Sc.D.

Here we are … Total Area: 31,113 mi2 Total Population: ~4.2m Proportion AA: 31% >40% of rural population is AA

Statement of the Problem National Level Incidence 1975-2002 Mortality Ries LAG, Eisner MP, Kosary CL, Hankey BF, Miller BA, Clegg L, Edwards BK. Cancer Statistics Review 1975-2002. 2005. Bethesda, MD, National Cancer Institute.

Statement of the Problem South Carolina Perspective Incidence 1996-2002 Mortality South Carolina Central Cancer Registry: Department of Health and Environmental Control. SCAN. For South Carolina Residents: Age Adjusted Rates 2000 US Standard Populations

Specific Aims Are to describe and compare the: Detection Diagnosis Treatment Abnormality Detection Delay Diagnosis Delay Treatment Delay Are to describe and compare the: distribution of tumor characteristics by race (AA vs. EA) pattern of diagnosis delay by race treatment delay by race relationship between mortality and diagnosis and treatment delay intervals, by race, after adjusting for traditional risk factors

Methods Participants: Covariates: Statistical analysis: 342 AA or EA women participating in SC’s Breast & Cervical Cancer Screening Pgm, the Best Chance Network (BCN) 19 women excluded with incomplete follow-up; 6 of other race Covariates: From BCN – Age, Income From SCCR – Tumor Stage, Grade, Behavior, ER/PR status Statistical analysis: Simple Univariate, Descriptive Cox Proportional Hazards

Demographic & Tumor Characteristics Demographic Characteristics AA (n=164) EA (n=150) Income $3,682 ($5,539) $5,434 ($6,491) Age at abnormality detection 55 (8.5) 55 (8.0) Tumor behavior (In-situ) 14% 11% Poorly /Undifferentiated 44% 40% Regional/Distant Spread 46% ER/PR Status +/+ 27% 34%

Interval and Outcome Data Summary of Detection, Interval and Outcome Data No Significant Difference in Method of Detection by Race Total Interval (Time from First Abnormal Screening to Treatment Initiation (Days) was longer in AA (65) than EA (54) (p=0.04) 39 EA women died, 34 of BrCA 34 AA women died, 25 of BrCA

Cox Model Results: Factors Influencing All-Cause Survival (BCN, 1996-2004) Variables Hazards Ratio 95% CI p-value Diagnosis delay 1.00 0.99, 1.01 0.98 Treatment delay 0.98, 1.01 0.38 Race (AA vs. EA) 3.85 1.13, 13.20 0.03 Regional/Distant (vs. Local) 3.68 2.18, 6.25 <0.0001 ER/PR (-/- vs. +/+) 4.78 2.28, 10.07 ER/PR +/- (or) -/+ 4.28 1.41, 12.98 0.02 ER/PR (unknown) 3.44 1.32, 9.01 0.01 Race*ER/PR (EA +/+ vs. Others) 0.59 0.39, 0.90

Breast Cancer Specific-Survival Analysis 1996 – 2004 By Race

Cox Model Results: Factors Influencing BrCA-Specific Survival (BCN, 1996-2004) Variables Hazards Ratio 95% CI p-value Diagnosis delay 1.00 0.98, 1.00 0.15 Treatment delay 0.98, 1.01 0.39 Race (AA vs. EA) 3.15 0.81, 12.26 0.09 Regional/Distant (vs. Local) 4.50 2.46, 8.36 <0.0001 ER/PR (-/- vs. +/+) 5.02 2.22, 11.38 0.0001 ER/PR +/- (or) -/+ 2.45 0.60, 10.04 0.21 ER/PR (unknown) 3.19 1.08, 9.47 0.03 Race*ER/PR (EA +/+ vs. Others) 0.68 0.43, 1.10 0.11

Discussion and Conclusion Overall: No apparent effect of delay for either all-cause or BrCA- specific mortality No affect of tumor grade, after accounting for stage No racial difference in terms of method of detection Significant factors affecting overall mortality: Race Stage ER/PR status ER/PR * race Results were similar for BrCA mortality except: Race and ER/PR-by-Race interaction did not achieve statistical significance – possible numbers problem