| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated  | 
| Pre-eclampsia | 
 
| Preeclampsia | 
 
 
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| E.1.1.1 | Medical condition in easily understood language  | 
| Pre-eclampsia | 
 
| Preeclampsia | 
 
 
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| E.1.1.2 | Therapeutic area  | Diseases [C] - Female diseases of the urinary and reproductive systems and pregancy complications [C13] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| E.1.2 | Version  | 20.0 | 
 
| E.1.2 | Level  | PT | 
 
| E.1.2 | Classification code  | 10036485 | 
 
| E.1.2 | Term  | Pre-eclampsia | 
 
| E.1.2 | System Organ Class  | 10036585 - Pregnancy, puerperium and perinatal conditions | 
 
 
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| E.1.3 | Condition being studied is a rare disease  |  No  | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial  | 
| To determine the effect of low-dose aspirin on the incidence of pre-eclampsia with delivery <37 weeks’ gestation. | 
 
| Determinar el efecto de la aspirina a dosis bajas sobre la incidencia de preeclampisa prematura con parto <37 semanas de gestación. | 
 
 
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| E.2.2 | Secondary objectives of the trial  | 
To determine the effect of low-dose aspirin on the incidence of: - Delivery with pre-eclampisa at <32 weeks, <34 weeks, <37 weeks and at any gestation. - Birth at <32 weeks, <34 weeks and <37 weeks. - Death of one twin and/or both twins before discharge from hospital. - Birthweight <3rd, <5th and <10th percentile for gestational age. - Placental abruption at <32 weeks, <34 weeks, <37 weeks and at any gestation. - Postpartum hemorrhage. - Neonatal morbidity. - Neonatal therapy. - Length of stay in neonatal intesive care unit. | 
 
Determinar el efecto de la aspirina a dosis bajas sobre la incidencia de: - Parto con preeclampsia a las <32 semanas, <34 semanas, <37 semanas y en cualquier gestación. - Parto pre-término a las <32 semanas, <34 semanas y <37 semanas de gestación. - Muerte de uno y/o ambos gemelos. - Peso neonatal <percentil 3, 5 y 10. - Desprendimiento placentario en <32 semanas, <34 semanas, <37 semanas o en cualquier momento de la gestación. - Hemorragia postparto. - Morbilidad neonatal. - Necesidad de terapia neonatal. - Tiempo de estancia en la unidad de cuidados intensivos neonatal. | 
 
 
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| E.2.3 | Trial contains a sub-study  |  No  | 
| E.3 | Principal inclusion criteria  | 
- Age >18 years. - Dichorionic diamniotic or Monochorionic diamniotic twin pregnancies. - Both livefetuses at 11+2 - 13+6 weeks of gestation. - Informed and written consent. | 
 
- Edad >18 años. - Embarazos gemelares dicoriónicos o monocoriónicos diamnióticos. - Ambos fetos vivos a las 11+2 - 13+6 semanas de gestación. - Consentimiento informado por escrito. | 
 
 
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| E.4 | Principal exclusion criteria | 
- Monoamniotic twins. - Triplet pregnancies that had undergone embryo reduction to twins or with one vanishing twin. - Pregnancies complicated by major fetal abnormality or nuchal translucency thickness >3.5mm identified at the 11+2 - 13+6 weeks scan. - Monochorionic diamniotic twin pregnancies in which there are early signs of twin-to-twin transfusion syndrome or selective fetal growth restriction defined by a 20% discordance in crown-rump length at the 11+2 - 13+6 weeks’ scan. - Those who lack capacity and who are unable to provide informed consent to take part. - Women   taking   low-dose   aspirin   regularly   (administration   must   have   ceased   >7   days   prior   to randomization). - Participation in another drug trial within the previous 7 days. - Haemorrhagic   diathesis;   coagulation   disorders   such   as   haemophilia   and thrombocytopeniaor concurrent anticoagulant therapy. - Active or history of recurrent peptic ulceration and/or gastric/intestinal haemorrhage, or other kinds of bleeding such as cerebrovascular haemorrhages;ď‚·Patients who are suffering from known gout, severe hepatic impairment or severe renal impairment. - Hypersensitivity to salicylic acid compoundsor prostaglandin synthetase inhibitors or to any excipients. - Patients on long term non-steroidal anti-inflammatory medication. - Not fluent in local language and absence of interprete. - Any other reason the clinical investigators think will prevent  the potential participant  from complying with the trial protocol. | 
 
- Gemelos monoamnióticos. - Embarazos de trillizos que se habían sometido a reducción de embriones a gemelos o con un gemelo desaparecido. - Embarazos complicados por una anomalía fetal importante o un grosor de la translucidez nucal >3,5mm a las 11+2 - 13+6 semanas. - Embarazos gemelares monocoriónicos diamnióticos en los que hay signos tempranos de síndrome de transfusión gemelo a gemelo o sFGR definidos por una discordancia del 20% en la CRL en la exploración de las 11 + 2-13 + 6 semanas;•Mujeres severamente enfermas o problemas mentales. - Participación en otro ensayo de medicamentos dentro de los 7 días anteriores. - Diátesis hemorrágica; trastornos de la coagulación como hemofilia y trombocitopenia o terapia anticoagulante concurrente. - Úlcera péptica activa o antecedente recurrente y/o hemorragia gástrica/intestinal u otros tipos de hemorragia como hemorragias cerebrovasculares. - Pacientes que padecen gota conocida, insuficiencia hepática grave o insuficiencia renal grave. - Hipersensibilidad a los compuestos del ácido salicílico o inhibidores de la prostaglandina sintetasa o cualquier excipiente. - Pacientes con medicación antiinflamatoria no esteroidea a largo plazo. - No habla con fluidez el idioma local y no cuenta con un intérprete. -Cualquier otra razón que los investigadores clínicos crean que evitará que el posible participante cumpla con el protocolo del ensayo. | 
 
 
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| E.5 End points | 
| E.5.1 | Primary end point(s) | 
| To determine the effect of low-dose aspirin on theincidence of preterm preeclampsiawith delivery <37 weeks’ gestation. | 
 
| Determinar  el  efecto  de  la  aspirina  en  dosis  bajas sobre la incidencia de preeclampsia prematura con parto <37 semanas de gestación. | 
 
 
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| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
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| E.5.2 | Secondary end point(s) | 
To determine the effect of low-dose aspirin on the incidence of: - Delivery with pre-eclampisa at <32 weeks, <34 weeks, <37 weeks and at any gestation. - Birth at <32 weeks, <34 weeks and <37 weeks. - Death of one twin and/or both twins before discharge from hospital. - Birthweight <3rd, <5th and <10th percentile for gestational age. - Placental abruption at <32 weeks, <34 weeks, <37 weeks and at any gestation. - Postpartum hemorrhage. | 
 
Determinar el efecto de la aspirina a dosis bajas sobre la incidencia de: - Parto con preeclampsia a las <32 semanas, <34 semanas, <37 semanas y en cualquier gestación. - Parto pre-término a las <32 semanas, <34 semanas y <37 semanas de gestación. - Muerte de uno y/o ambos gemelos. - Peso neonatal <percentil 3, 5 y 10. - Desprendimiento placentario en <32 semanas, <34 semanas, <37 semanas o en cualquier momento de la gestación. - Hemorragia postparto. - Morbilidad neonatal. - Necesidad de terapia neonatal. - Tiempo de estancia en la unidad de cuidados intensivos neonatal. | 
 
 
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| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
 | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis |  No  | 
| E.6.2 | Prophylaxis |  Yes  | 
| E.6.3 | Therapy |  No  | 
| E.6.4 | Safety |  Yes  | 
| E.6.5 | Efficacy |  Yes  | 
| E.6.6 | Pharmacokinetic |  No  | 
| E.6.7 | Pharmacodynamic |  No  | 
| E.6.8 | Bioequivalence |  No  | 
| E.6.9 | Dose response |  No  | 
| E.6.10 | Pharmacogenetic |  No  | 
| E.6.11 | Pharmacogenomic |  No  | 
| E.6.12 | Pharmacoeconomic |  No  | 
| E.6.13 | Others |  No  | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) |  No  | 
| E.7.1.1 | First administration to humans |  No  | 
| E.7.1.2 | Bioequivalence study |  No  | 
| E.7.1.3 | Other |  No  | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) |  No  | 
| E.7.3 | Therapeutic confirmatory (Phase III) |  Yes  | 
| E.7.4 | Therapeutic use (Phase IV) |  No  | 
| E.8 Design of the trial | 
| E.8.1 | Controlled |  Yes  | 
| E.8.1.1 | Randomised |  Yes  | 
| E.8.1.2 | Open |  No  | 
| E.8.1.3 | Single blind |  No  | 
| E.8.1.4 | Double blind  |  Yes  | 
| E.8.1.5 | Parallel group |  No  | 
| E.8.1.6 | Cross over  |  No  | 
| E.8.1.7 | Other |  No  | 
| E.8.2 |  Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) |  No  | 
| E.8.2.2 | Placebo  |  Yes  | 
| E.8.2.3 | Other |  No  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | 
                                The trial involves single site in the Member State concerned
                             |  No  | 
| E.8.4 |  The trial involves multiple sites in the Member State concerned  |  Yes  | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 5 | 
| E.8.5 | The trial involves multiple Member States |  Yes  | 
| E.8.5.1 | Number of sites anticipated in the EEA | 16 | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA |  Yes  | 
| E.8.6.2 | Trial being conducted completely outside of the EEA |  No  | 
| E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned | 
| Argentina | 
 
| Australia | 
 
| Brazil | 
 
| Israel | 
 
| Austria | 
 
| Poland | 
 
| Bulgaria | 
 
| Spain | 
 
| Czechia | 
 
| Germany | 
 
| Greece | 
 
| Italy | 
 
| Belgium | 
 
| Denmark | 
 
| Hungary | 
 
| Ireland | 
 
| Portugal | 
 
| United Kingdom | 
 
 
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| E.8.7 | Trial has a data monitoring committee |  Yes  | 
| E.8.8 | 
                        Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial
                     | 
 | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 3 | 
| E.8.9.1 | In the Member State concerned months | 10 | 
| E.8.9.1 | In the Member State concerned days |  | 
| E.8.9.2 | In all countries concerned by the trial years | 3 | 
| E.8.9.2 | In all countries concerned by the trial months | 10 |