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TRANSCRIPT
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J E N N I F E R L . Y O U N G , M D , M P H
G R A N D R O U N D S
D e p a r t m e n t o f O b s t e t r i c s a n d G y n e c o l o g y
M e d i c a l U n i v e r s i t y o f S o u t h C a r o l i n a
J a n u a r y 2 5 , 2 0 1 1
From Kilimanjaro to Charleston: How Cervical cancer screening in Africa
may impact our practice in the future
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64,928Europe
67,078
AFRICA49,025
South America
14,845United States/
Canada
1,077Australia/
New Zealand
39,648Southeast
Asia
51,266Eastern Asia
21,596Central America
151,297Southcentral
Asia
Cervical Cancer: A Worldwide Problem
Prevalence: 2,274,000 women have cervical cancer1
Incidence: 510,000 new cases each year1
1. World Health Organization. Geneva, Switzerland: World Health Organization; 2003:1–74. 2. Bosch FX, de Sanjosé S. J Natl Cancer Inst Monogr. 2003;31:3–13. Modified after Merck & Co.
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Objectives
Provide you with an understanding of the timeline and planning that goes into international research
Why does a study take 3 yrs to initiate and 3 wks to complete
Discuss types of HPV testing kits and differences between them
Why can’t we just use what we have here?
By the way, what test is that?
Review the data obtained from rapid HPV testing in rural Tanzania
How Arusha TZ is ahead of SC
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Options for HPV testing in low resource settings
Pap smear Low sensitivity – requires repeat testing over years
High materials cost – requires use of slides (difficult to transport) or liquid media with expensive equipment
Low reproducibility – need expert pathologists
Visual inspection with acetic acid (VIA) Low sensitivity for small, early lesions
Requires expert examination and biopsies (with pathologist)
HPV testing High sensitivity
Limited expertise necessary
Method of testing determines expense
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Sakaranarayanan R et al. NEJM 2009. 360:1385.
HPV testing decreases cervical cancer mortality
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Tanzanian pilot study
•Plan to bring careHPV to rural mission hospital in Arusha, TZ
•Population of unscreened Masai women
•Pilot of 300 women for feasibility
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Objectives of Tanzanian Pilot study
Aim 1: HPV genotyping to determine applicability of HPV vaccination in this area
Aim 2: Comparison of standard methods of cervical cancer screening
Aim 3: Comparison of careHPV to HC2 HPV testing for utilization in this low resource setting
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Tanzania 2008
Building relationships
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Hospice visits – dispensing medications and providing support
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Study items established
Female providers preferred
Women know about cervical cancer and are interested in being screened
Cannot exclude the hospital staff
Exam remains very embarassing for women, even health care professionals
Hospice team has strong connections to community for recruitment
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Tanzania 2009
A feasibility study
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Its in the details
5 team members
2 nurses
1 translator
6 suitcases of equipment
One close call with import services
One not as close call with US customs
1 grand rounds on HPV and cervical cancer
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Everybody has a different job…
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Study items established
Protocol as it stands is feasible
Need community based consent process
Established core Selian staff for assistance
Cleaning and sterilization techniques acceptable to staff
Shipping paps for US testing feasible and consistent with expected results
3 outreach lectures to community and health care workers
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HPV testing: aren’t they all the same?
All testing based on DNA amplification No utilize traditional PCR for this methodology Tests available include: Hybrid capture II Cervista Cervista 16,18 careHPV And others
Keep in mind the goal not to determine any presence of HPV but rather to determine the likelihood that the patient has a
dysplasia caused by HPV
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PCR methodology
Method was devised by
Kary Mullis of Cetus
Corporation, Emeryville
• He recieved a $20,000
bonus and later a Nobel
Prize
• Later the patent was
sold to Hoffman-
LaRoche for
$300,000,000
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PCR
1. Hologic. Cervista package insert. 2010
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Hybrid capture II
Nucleic acid hybridization assay Target DNA hybridized with specific RNA probes In this case: 13 HPV types 16,18,33,35,39,45,51,52,58,59,68
DNA-RNA hybrids captured on a microplate with antibodies specific to these
Signal detection with labelled, conjugated antibodies Emitted light measured as relative light units where 1.0
consistent with 1 pg HPV DNA/mL
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Receiver operating characteristic (ROC) curve of the Hybrid Capture I assay and the Hybrid
Capture II assay.
Kuhn L et al. JNCI J Natl Cancer Inst 2000;92:818-825
© Oxford University Press
CIN2+2
Sensitivity 80%Specificity 85.4%PPV 21.1%NPV 99.0%
2. Soderlund-Strand et al. J Clin Microbiol 2005: 43(7): 3260.
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Cervista™
Utilizes patented Invader technology
Signal amplification of specific DNA sequences
14 HPV types tested
HPV16, 18, 31, 33, 35,39, 45, 51, 52, 56, 58, 59, 66, and 68
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Clinical Performance Summary of Cervista: Compared to Colposcopy/Central Histology ≥ CIN2
among Women with ASC-US Cytology
Sensitivity 92.8% (64/69) 95% CI: (84.1% - 96.9%)
Specificity 44.2% (558/1263) 95% CI: (41.5% - 46.9%)
PPV 8.3% (64/769) 95% CI: (7.6% - 8.9%)
NPV 99.1% (558/563) 95% CI: (98.1% - 99.6%)
Disease Prevalence 5.2% (69/1332) Note: Among women with ASC-US cytology, there were 1.1% (15 out
1347) CervistaTM HPV HR indeterminate results with 95% CI: 0.7% to 1.8%.
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Cervista™: Limitations
Does not detect DNA of HPV low-risk types (6,11,42,43,44)
Exhibits cross-reactivity to two HPV types of unknown risk
An HPV positive result was observed with 5000 copies/reaction of HPV type 67
50,000 copies/reaction of HPV type 70.
Does not exclude the possibility of HPV infection because very low levels of infection or sampling error may cause a false-negative result
Interference was observed in cervical specimens contaminated with high levels (2%) of contraceptive jelly and/or anti-fungal creams
The test has been validated for use only with cervical cytology specimens
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Cervista vs HC2
SHENCCAST II study – China
8,435 women
By ROC curves, tests are clinically equivalent
Cervista Hybrid Capture II
p-value
Disease prevalence
11.1% 13.6%
Sensitivity for CIN2+
92.9% 95.5%
Specificity 91.1% 88.6% <0.05
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careHPV compared to Hybrid Capture 2
careHPV Hybrid Capture 2 (HC2)
DNA amplification DNA amplification
Solution surfactants Solution toxic chaotropic salts
Assay time 2.5 hours Assay time 6 hours
Capture magnetized beads coated with monoclonal antibody
Capture microplates
Cost $4 Cost $100
Qiao Y et al. Lancet Oncol 2008; 9: 929-936.
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careHPV Test: New rapid HPV test developed by QIAGEN (Gaithersburg, MD)
2388 women tested in rural China
70 diagnosed with ≥ CIN2
Using diagnosis of CIN2+ as the standard
Qiao Y et al. Lancet Oncol 2008; 9: 929-936.
Test Sensitivity Specificity
careHPV 90% 84.2%
VIA 41.4% 94.5%
Hybrid Capture 2 97.1% 85.6%
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Team Tanzania 2010
15 team members
3 female health care providers
3 excellent pap smear cleaners
1 study coordinator
1 scientist
2 Hospice nurses
2 nursing assistants
2 lab assistances
1 driver
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The details
4 boxes of testing equipment
20 boxes of gloves
15 tubes of KY jelly
325 thin prep paps
325 Digene careHPV tests
600 consents and 300 study intake forms
1000 glass slides
324 patients enrolled
2 facilities
1 truck
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A note on approval, consent, and recruitment
IRB approval took 2 years
Cancer center protocol review comm
UVA IRB
Selian IRB
Tanzanian Government IRB (wait 4-6 months…)
Edits made
Repeat………………..x3!
Consent
Education first!
Translation only or a true connection to the community
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Recruitment
Mama Makule with Dr. Peyton Taylor (Babu)
Meetings held with regional pastors association
Significant education regarding cervical ca and screening
Screening study annouced in congregations for 3 weeks
Each day brought one congretation of women
Transportation provided
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Study population
324 women enrolled
Average age 42 years (30-60 years)
Majority in monogamous relationships
21% postmenopausal
Nonsmokers
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HPV and Pap Testing results
42/324 (12.8%) were HPV positive
7 of 42 or 16.7% were positive for ≥ CIN2
No cancers were diagnosed
1 patient diagnosed with CIN3 was negative for HPV
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Comparison of careHPV to HC2
Specimens careHPV HC2 HR HPV DNAor CIN2/3
True positives 31 + + +
2 - + +
2 + - +
True Negatives 278 - - -
9 - + -
Indeterminate 1 - - +
•careHPV agreement with HC2•Positive agreement 94% (95% CI 80.4, 98.3)•Negative agreement 99.3% (95% CI 97.4, 99.8)•Total agreement 98.7% (95% CI 96.8, 99.5)
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Comparing Testing Methods
Test Sensitivity Specificity PPV NPV
VIA 34% 81.8% 21.9% 89%
Pap smear 48.7% 99% 95% 92.9%
HC2 96.9% 94% 78.6% 99.2%
careHPV 99.6% 94% 97% 99.3%
Note that disease is defined as HPV infection not dysplasia based on currentrecommendiations for treatment in low resource settings.
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Most frequent HPV genotypes
6
1 1
4
2
4
1 1
4
1
3
1
2
1
0
1
2
3
4
5
6
7
Number of Specimens
16 18 26 31 33 35 39 45 51 52 56 58 66 68
High risk HPV genotypes
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HPV genotyping implications
HPV 16/18 offered in current HPV vaccinations
7/42 or 16.7% positive for HPV 16 or 18
Much lower than the anticipated 70% reduction in cervical HPV disease quoted for HPV vaccine in developed countries
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Conclusions
HPV testing remains the best option for cervical cancer screening in low resource setting
careHPV shows excellent agreement with current sophisticated HPV testing methods
Low prevalence of HPV types covered by current vaccination
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Acknowledgements
Dr. Peyton Taylor
Dr. Mark Stoler
Dr. Paul Eder
QIAGEN
Ms. Barbara Badman
Mrs. Asha Nyanga’nyi
Dr. Gweneth Lazenby
Dr. Emil Mchaki
Mrs. Elizabeth Makule
Selian and ALMC staff