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Kathryn Rodgers gcc 2015

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Presentation at Massachusetts Green Careers Conference 2015

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Kathryn Rodgers gcc 2015

  1. 1. Kathryn Rodgers, MPH Silent Spring Institute www.silentspring.org Massachusetts Green Careers Conference October 1, 2015
  2. 2. Silent Spring Institute History • Founded in 1994 by breast cancer activists to investigate why breast cancer rates were higher on Cape Cod. • Named in Rachel Carson’s legacy. “For those in whom cancer is already a hidden or visible presence, efforts to find cures must of course continue. But for those not yet touched by the disease and certainly for the generations as yet unborn, prevention is the imperative need.”
  3. 3. Research Areas Study chemicals that are mammary gland carcinogens Study chemical exposures from everyday products Develop best practices for sharing results with community Study endocrine disrupting chemicals in water sources www.silentspring.or
  4. 4. Science to Action We use our scientific expertise about chemicals that have high exposure and high health concern to target best ways to improve health. www.silentspring.org
  5. 5. Cancer Prevention Science Biological mechanism Human exposure Basis for action + Educate Regulate Reformulate Biological mechanism Human exposure Educate Regulate Reformulate Strength of evidence, not “proof” www.silentspring.or
  6. 6. How might chemicals increase breast cancer risk? • Damaging DNA Ionizing radiation • Promoting tumor growth HRT • Disrupting development -> vulnerability DES www.silentspring.or
  7. 7. Age-adjusted annual incidence rates for invasive breast cancer at Kaiser Permanente Northwest Glass, A. G. et al. J. Natl. Cancer Inst. 2007 99:1152-1161 Breast cancer incidence dropped when older women went off HRT Women < 45 45+ The WHI scenario resulted in 4.3 million fewer cHT users, 126,000 fewer breast cancer cases, 76,000 fewer cardiovascular disease cases, 263,000 more fractures, 145,000 more quality-adjusted life-years, and expenditure savings of $35.2 billion. Roth et al. 2014 www.silentspring.or
  8. 8. 60+ years to develop human evidenceof breast cancer link Hoover et al, 2011 Prescribed to pregnant women in 1940s-60s Diethylstilbestrol (DES) www.silentspring.or
  9. 9. Compounds Classified as Group 1 via Population Studies: Aflatoxins Aristolochic Acid/Plants Arsenic Fluoro-edenite Outdoor Air Pollution/PM IARC www.silentspring.or
  10. 10. Rodent MCs indicate likely breast carcinogens – consistent evidence Rudel et. al 2014 Environmental Health Perspectives Exposure Human Breast Cancer Rodent Mammary Tumors HRT (E + P) + + HRT (E) (+) + Oral Contraceptives (E + P) + + DES + + Griseofulvin, Furosamide, Metronidazole (+) + Indomethacin, Nitrofurantoin (-) + Ionizing radiation + + Alcohol + (+) Heterocyclic amines (meat) (+) + Sleep disruption (+) + Ethylene oxide (+) + PAH (+) + Solvents (+) + DDE (adult exposure) - - DDT (early life exposure) (+) Not tested PCBs (general population) - - PCBs (polymorphism) (+) Not tested Dioxin (early life exposure) (+) (+) + Stronger evidence of association (+) Limited evidence of association (-) Limited evidence for no association - Stronger evidence for no association www.silentspring.org
  11. 11. Rudel et al. 2007 We compiled 216 rodent mammary carcinogens www.silentspring.org/sciencereview www.silentspring.or
  12. 12. Epidemiologists use the “breast cancer list” to inform studies
  13. 13. www.silentspring.or
  14. 14. Revolution in toxicology – high throughput screening 96-, 384-, 1536 Well Plates Target Biology (e.g., Estrogen Receptor) Robots Pathwa y Chemical Exposure Cell Population EPA slide www.silentspring.org
  15. 15. www.silentspring.orgwww.silentspring.org
  16. 16. Cancer Prevention Science Biological mechanism Human exposure Basis for action + Educate Regulate Reformulate Biological mechanism Human exposure Educate Regulate Reformulate Strength of evidence, not “proof” www.silentspring.or
  17. 17. Household Exposure Study www.silentspring.or
  18. 18. Household Exposure Study – Cape Cod Hypothesis: We will find EDCs and MCs from commercial products in indoor environments at levels that reflect significant exposures Approach: • New multi-residue methods for a large number of chemicals • Air, dust, and urine samples to identify exposure pathways www.silentspring.or
  19. 19. What are We Exposed To? • About 20 chemicals per home • 67 EDCs, 27 pesticides • DDT 2/3 of homes • Phthalates - 100% homes • Parabens, alkylphenols - abundant • Flame retardants – 10X Europe levels • 15 chemicals above health-based guidelines (39 have guidelines) • 100 of 120 homes above health guidelines • Participants want their results! Rudel et al. 2003. Environmental Science & Technology www.silentspring.or
  20. 20. Household Exposure Study – California Hypothesis: Indoor environments will be similar for most commercial chemicals Approach: • Similar methods as in Cape Cod • Demographically/geographically diverse population • Paired indoor-outdoor air samples in two communities with contrasting outdoor pollution www.silentspring.org
  21. 21. 0 500 1000 1500 2000 2500 3000 3500 4000 Germany (n=24) 2002 UK (n=28) 2006 Canada (n=68) 2002-2003 Cape Cod, MA (n=89) 1999-2001 Boston, MA (n=11) 2004-2005 Washington DC (n=17) 2004 Texas (n=20) 2006 California (n=49) 2006 PBDEdustconcentrations(ng/g) BDE 47 BDE 99 BDE 100 California PBDE dust levels 4 to 10 times higher than other North American regions California house dust has highest levels of PBDs Zota et al. 2008. Environmental Science & www.silentspring.or
  22. 22. Blood PBDE levels in Californians nearly two fold higher than rest of the U.S. ∑ PBDEs = sum of BDE-28, -47, -99,-100,-153, -154 0 10 20 30 40 50 60 70 80 California Other U.S. states SPBDEserumconcentrations(ng/glipid) p = 0.002 Zota et al., 2008 www.silentspring.orgZota et al. 2008. Environmental Science & Technology
  23. 23. California HES revisited: House dust levels 5 years later • Hypothesis: Types and levels of flame retardants will change because of phase-outs Samples collected in 2006 (n=50) Indoor air – 153 analytes (3 FRs) Outdoor air – 153 analytes (3 FRs) House dust – 79 analytes (4 FRs) Samples collected in 2011 (n=16) House dust – 62 analytes (49 FRs) Revisited www.silentspring.or
  24. 24. Many flame retardants detected, highest concentrations were carcinogens • 44 flame retardants detected; 36 in 50% of homes • Chemicals with highest concentrations 2006 2011 TCEP* TBOEP TCIPP TCIPP TBOEP TCEP* TDCIPP* TDCIPP* BDE 99 BDE 99 *carcinogens under California’s Proposition 65 Dodson et al. 2012. Environmental Science & Technology www.silentspring.or
  25. 25. Firemaster 550 levels increased in homes as it replaced PentaBDE www.silentspring.orDodson et al. 2012. Environmental Science & Technology
  26. 26. Cancer Prevention Science Biological mechanism Human exposure Basis for action + Educate Regulate Reformulate Biological mechanism Human exposure Educate Regulate Reformulate Strength of evidence, not “proof” www.silentspring.or
  27. 27. Impact: Science and Policy Science • Flame retardants are among most abundant and most toxic home exposures. • Levels in California are among the highest in the world. • Developed the most extensive methods to measure flame retardants. • Sparked interest among researchers worldwide. Policy • High levels in California due to the state’s furniture flammability standard. • Revision of California standard no longer requires flame retardants. • Ban on PBDEs resulted in “regrettable substitutes”. Cited as a reason for US to revise chemical safety laws. • Our research supports changing local and national flame retardant regulations. www.silentspring.or
  28. 28. Thank you! Visit www.silentspring.org

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