Jacob Canick, PhD on behalf of the FASTER Consortium 12 th International Conference

Jacob Canick, PhDon behalf of the FASTER Consortium

12th International Conferenceon Prenatal Diagnosis and Therapy

Budapest

June 24-27, 2004

First and Second Trimester Screening Markers:

Results of the FASTER Trial

The Faster Consortium

• Mary D’Alton overall PI

• Fergal Malone co-PI • Nicholas Wald analysis

• Alicja Rudnicka analysis

• Allan Hackshaw analysis

• Jacob Canick laboratory

• Geralyn Messerlian lab

• Diana Bianchi fetal cells and fetal

outcome

• Kimberly Dukes data mgmt

• Robert Ball Intermountain Utah

• David Nyberg Swedish Med Ctr

• Christine Comstock Beaumont

• Radek Bukowski UT-Galveston

• Richard Berkowitz Mount Sinai

• Susan Gross Albert Einstein

• Lorraine Dugoff Univ Colorado

• Sabrina Craigo Tufts NE Med Ctr

• Ilan Timor NYU

• Stephen Carr Women & Infants

• Honor Wolfe UNC Chapel Hill

National Institute of Child Health and Human Development Grant RO1 HD 38652

FASTER Components

• Coordinating and educational center• Columbia University, New York

• Enrollment centers• 15 prenatal diagnostic centers in the U.S.

• Assays, reporting, and NT management • Women & Infants Hospital, Brown Medical School

• Data management• DMStat, Inc., Boston

• Data analysis• Wolfson Institute for Preventive Medicine, London

Swedish Medical Center

University of Colorado

UTMB Galveston

UNC Chapel Hill

William Beaumont Hospital

University of UtahIntermountain HealthCare

Columbia UniversityMount SinaiAlbert EinsteinNew York University

Tufts University

Brown University

The FASTER Consortium

OBJECTIVES

• To define performance of first trimester combined ultrasound and serum screening.

• To compare performance of first trimester combined screening and second trimester quad marker screening in the same women.

• To describe optimal combinations of tests for population-based Down syndrome screening.

STUDY DESIGN

• Prospective trial: intervention only after both 1st and 2nd trimester screening completed.

• A direct comparison is the only way to compare 1st and 2nd trimester screening fairly.

• Inclusion criteria:• Viable singleton pregnancy (≥ 16 yrs)• 103 – 136 weeks (CRL 36 – 79 mm)

• Exclusion criteria:• Anencephaly• Septated cystic hygroma

103 – 136 weeksNT / PAPP-A / fβhCG / Age

150 – 186 weeksAFP / hCG / uE3 / Inh-A / Age

First -Second -

First -Second +

First +Second -

First +Second +

Genetic CounselingAmniocentesis offered

Follow-Up(pregnancy / pediatric)

Karyotype(amnio / SAB / cord blood)

Septatedcystic hygroma

Nuchal Translucency Sonography

• 102 sonographers

• Initial uniform practical training

• Standard NT protocol

• > 50 images each to confirm technique

RESULTS• These results were reported at the Society for

Maternal Fetal Medicine annual meeting, held in New Orleans in February 2004.

• The results are from an interim analysis.

• Final data analysis has now been completed, and the principal findings of the FASTER Trial are being prepared for publication.

• The performance estimates will be slightly different in the final analysis.

42,367 Evaluated

134 Cystic Hygroma

38,033 First Trimester Screening

4,178 Ineligible*

22 Anencephaly

RESULTS

38,189 Eligible

35,244 Second Trimester Screening (93%)

*Ineligible due to: CRL outside range (2636); multiple (896); <16 years (357); refused (203); other (69)

2,789 No quad sample

Completeness of Ascertainment

Pregnancies enrolled 38,189

Outcome obtained (n) 37,002

Outcome obtained (%) 97%

Downs expected* 112

Downs observed 117

* Estimates based on maternal age distribution of enrolled patients, and 23% loss rate from 16 - 40 wks

Maternal Age Distribution*

• Mean = 30.1 years• SD = 5.8 years• Range = 16 – 53 years

21.6%

78.4%

< 35

≥ 35

* Maternal age in years at Estimated Date of Delivery

Maternal Race Distribution

Other (2%)Asian (4%)

African-American (5%)

Hispanic (22%)

Caucasian (67%)

Down Syndrome Screening PerformanceDirectly Observed Results

1. Combined First Trimester ScreenNT / PAPP-A / fβhCG / age

2. Second Trimester Serum ScreenAFP / hCG / uE3 / Inhibin-A / age

3. Integrated 1st and 2nd Trimester ScreenI. SERUM: PAPP-A / AFP / hCG / uE3 / Inh-A / age

II. FULL: NT / PAPP-A / AFP / hCG / uE3 / Inh-A / age

Observed Detection Rates and FPRs

DR FPR

Combined screen 83%5.6%

(1:300 term cut-off)

Quad screen 85%8.5%

(1:300 term cut-off)

Based on pregnancies with complete 1st and 2nd trimester data (87 Downs; 33470 unaffected)

Combined Versus Quad ScreeningWhich is better?

p = 0.7

Discordant pairs analysis:

No significant difference.

Cystic Hygroma Outcome134 Cases (1 : 285 Pregnancies)

50% Aneuploidy (n=67):• 37% Down (n=25)• 28% Turner (n=19)• 20% Trisomy 18 (n=13)• 15% Other (n=10)

50% Euploid (n=67):• 32% Cardiac anomaly (n=21)• 12% Skeletal anomaly (n=8)• 10% Fetal demise (n=7)• 46% “Normal” (n=31)

Observed Detection Rates and FPRs

DR FPR

Combined screen 83% 5.6%(1:300 term cut-off)

Combined screen 87% 5.6%With hygromas (1:300 term cut-off)

Quad screen 85% 8.5%(1:300 term cut-off)

Based on pregnancies with complete 1st and 2nd trimester data (87 Downs; 33470 unaffected)

• Developed by Nick Wald in 1999.

• The integration of the best tests performed at different times in pregnancy into a single test.

• A single risk is estimated after the two parts of the test have been completed.

0 13 26 40 PAPP-A quad test = SERUM INTEGRATED NT+PAPP-A quad test = FULL INTEGRATED

(weeks)

Integrate results into a single risk

Other Combinations of Markers:The Integrated Test

Observed Detection Rates for 5% FPR

1st Trimester Integrated 1st / 2nd Trim.2nd Trimester

All screens include maternal age

≥

31%

0%

20%

40%

60%

80%

100%

Age 35 NT Combined Triple Quadruple Serum Full




≥

67%

83%

31%

0%

20%

40%

60%

80%

100%





≥

67%72%

79%83%

31%

0%

20%

40%

60%

80%

100%





≥

67%72%

84%88%

79%83%

31%

0%

20%

40%

60%

80%

100%




Observed FPR for 85% Detection Rate

7.6%

17.4%

0%

5%

10%

15%

20%

NT Combined Triple Quadruple Serum Full




7.2%

11.5%

7.6%

17.4%

0%

5%

10%

15%

20%





2.4%

5.5%7.2%

11.5%

7.6%

17.4%

0%

5%

10%

15%

20%


Down Syndrome PregnanciesFirst Trimester Median MoMs

Completed week

11 12 13

NT 2.20 1.75 1.39

PAPP-A 0.30 0.49 0.78

fβhCG 1.66 2.03 2.49

Calculated from linear regression of individual Downs cases

Using these data and applying them

to the U.S. population of pregnancies,

the following results were obtained:

Down Syndrome Screening Performance

NT alone

Quad

FPR for 85% Detection Rate

24%

34%

15.4%

0%

10%

20%

30%

40%

11 weeks 12 weeks 13 weeks

NT alone Combined

Quad


24%

34%

1.4%

5.9%

14%15.4%

0%

10%

20%

30%

40%


NT alone Combined

Quad


Serum Integrated

24%

34%

1.4%

5.9%

14%

1.7%4.7%

6.6%

15.4%

0%

10%

20%

30%

40%


NT alone Combined

Quad


Serum Integrated Full Integrated

24%

34%

1.4%

5.9%

14%

1.7%4.7%

6.6%

0.2% 0.8%3%

15.4%

0%

10%

20%

30%

40%


NT alone Combined

Quad


Serum Integrated Full Integrated

24%

34%

1.4%

5.9%

14%

1.7%4.7%

6.6%

0.2% 0.8%3%

15.4%

7.6%

0%

10%

20%

30%

40%


CONCLUSIONS

• 1st trimester combined and 2nd trimester quad screening are similarly effective .

• The Integrated test performs better than either the 1st or 2nd trimester screening methods.

• 1st trimester markers vary by gestational age. Algorithms should account for these gestational age effects.

ACKNOWLEDGMENTS

• Columbia: K. Welch, R. Denchy, K. Berentsen

• Univ Utah: F. Porter, L. Cannon, K. Nelson, C. Loucks, A. Yoshimura

• Swedish: D. Luthy, S. Coe

• Beaumont: D. Schmidt, J. Esler

• UTMB: G. Saade, G. Hankins, J. Lee

• Mount Sinai: K. Eddleman, Y. Kharbutli

• Montefiore: I. Merkatz, S. Carter

• U Colorado: J. Hobbins, L. Schultz

• Tufts U: B. Isquith, B. Berlin

• NYU: M. Paidas, J. Borsuk

• Brown U: C. Duquette

• UNC: R. Baughman

• DM-STAT: D. Emig, T. Tripp, J. Vidaver, L. Sullivan, N. Tibbetts, P. Folan

• NICHD: J. Hanson, D. Alexander, F. de la Cruz

• ….. and all 102 sonographers who participated

Jacob Canick, PhD on behalf of the FASTER Consortium 12 th International Conference

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