RT Journal Article T1 Association between convalescent plasma treatment and mortality in COVID-19: a collaborative systematic review and meta-analysis of randomized clinical trials. A1 Axfors, Cathrine A1 Janiaud, Perrine A1 Schmitt, Andreas M A1 Van't Hooft, Janneke A1 Smith, Emily R A1 Haber, Noah A A1 Abayomi, Akin A1 Abduljalil, Manal A1 Abdulrahman, Abdulkarim A1 Acosta-Ampudia, Yeny A1 Aguilar-Guisado, Manuela A1 Al-Beidh, Farah A1 Alejandria, Marissa M A1 Alfonso, Rachelle N A1 Ali, Mohammad A1 AlQahtani, Manaf A1 AlZamrooni, Alaa A1 Anaya, Juan-Manuel A1 Ang, Mark Angelo C A1 Aomar, Ismael F A1 Argumanis, Luis E A1 Averyanov, Alexander A1 Baklaushev, Vladimir P A1 Balionis, Olga A1 Benfield, Thomas A1 Berry, Scott A1 Birocco, Nadia A1 Bonifacio, Lynn B A1 Bowen, Asha C A1 Bown, Abbie A1 Cabello-Gutierrez, Carlos A1 Camacho, Bernardo A1 Camacho-Ortiz, Adrian A1 Campbell-Lee, Sally A1 Cao, Damon H A1 Cardesa, Ana A1 Carnate, Jose M A1 Castillo, German Jr J A1 Cavallo, Rossana A1 Chowdhury, Fazle R A1 Chowdhury, Forhad U H A1 Ciccone, Giovannino A1 Cingolani, Antonella A1 Climacosa, Fresthel Monica M A1 Compernolle, Veerle A1 Cortez, Carlo Francisco N A1 Costa Neto, Abel A1 D'Antico, Sergio A1 Daly, James A1 Danielle, Franca A1 Davis, Joshua S A1 De Rosa, Francesco Giuseppe A1 Denholm, Justin T A1 Denkinger, Claudia M A1 Desmecht, Daniel A1 Diaz-Coronado, Juan C A1 Diaz Ponce-Medrano, Juan A A1 Donneau, Anne-Françoise A1 Dumagay, Teresita E A1 Dunachie, Susanna A1 Dungog, Cecile C A1 Erinoso, Olufemi A1 Escasa, Ivy Mae S A1 Estcourt, Lise J A1 Evans, Amy A1 Evasan, Agnes L M A1 Fareli, Christian J A1 Fernandez-Sanchez, Veronica A1 Galassi, Claudia A1 Gallo, Juan E A1 Garcia, Patricia J A1 Garcia, Patricia L A1 Garcia, Jesus A A1 Garigliany, Mutien A1 Garza-Gonzalez, Elvira A1 Gauiran, Deonne Thaddeus V A1 Gaviria García, Paula A A1 Giron-Gonzalez, Jose-Antonio A1 Gomez-Almaguer, David A1 Gordon, Anthony C A1 Gothot, Andre A1 Grass Guaqueta, Jeser Santiago A1 Green, Cameron A1 Grimaldi, David A1 Hammond, Naomi E A1 Harvala, Heli A1 Heralde, Francisco M A1 Herrick, Jesica A1 Higgins, Alisa M A1 Hills, Thomas E A1 Hines, Jennifer A1 Holm, Karin A1 Hoque, Ashraful A1 Hoste, Eric A1 Ignacio, Jose M A1 Ivanov, Alexander V A1 Janssen, Maike A1 Jennings, Jeffrey H A1 Jha, Vivekanand A1 King, Ruby Anne N A1 Kjeldsen-Kragh, Jens A1 Klenerman, Paul A1 Kotecha, Aditya A1 Krapp, Fiorella A1 Labanca, Luciana A1 Laing, Emma A1 Landin-Olsson, Mona A1 Laterre, Pierre-François A1 Lim, Lyn-Li A1 Lim, Jodor A1 Ljungquist, Oskar A1 Llaca-Díaz, Jorge M A1 Lopez-Robles, Concepcion A1 Lopez-Cardenas, Salvador A1 Lopez-Plaza, Ileana A1 Lucero, Josephine Anne C A1 Lundgren, Maria A1 Macias, Juan A1 Maganito, Sandy C A1 Malundo, Anna Flor G A1 Manrique, Ruben D A1 Manzini, Paola M A1 Marcos, Miguel A1 Marquez, Ignacio A1 Martinez-Marcos, Francisco Javier A1 Mata, Ana M A1 McArthur, Colin J A1 McQuilten, Zoe K A1 McVerry, Bryan J A1 Menon, David K A1 Meyfroidt, Geert A1 Mirasol, Ma Angelina L A1 Misset, Benoît A1 Molton, James S A1 Mondragon, Alric V A1 Monsalve, Diana M A1 Moradi Choghakabodi, Parastoo A1 Morpeth, Susan C A1 Mouncey, Paul R A1 Moutschen, Michel A1 Müller-Tidow, Carsten A1 Murphy, Erin A1 Najdovski, Tome A1 Nichol, Alistair D A1 Nielsen, Henrik A1 Novak, Richard M A1 O'Sullivan, Matthew V N A1 Olalla, Julian A1 Osibogun, Akin A1 Osikomaiya, Bodunrin A1 Oyonarte, Salvador A1 Pardo-Oviedo, Juan M A1 Patel, Mahesh C A1 Paterson, David L A1 Peña-Perez, Carlos A A1 Perez-Calatayud, Angel A A1 Perez-Alba, Eduardo A1 Perkina, Anastasia A1 Perry, Naomi A1 Pouladzadeh, Mandana A1 Poyato, Inmaculada A1 Price, David J A1 Quero, Anne Kristine H A1 Rahman, Md M A1 Rahman, Md S A1 Ramesh, Mayur A1 Ramirez-Santana, Carolina A1 Rasmussen, Magnus A1 Rees, Megan A A1 Rego, Eduardo A1 Roberts, Jason A A1 Roberts, David J A1 Rodriguez, Yhojan A1 Rodriguez-Baño, Jesus A1 Rogers, Benjamin A A1 Rojas, Manuel A1 Romero, Alberto A1 Rowan, Kathryn M A1 Saccona, Fabio A1 Safdarian, Mehdi A1 Santos, Maria Clariza M A1 Sasadeusz, Joe A1 Scozzari, Gitana A1 Shankar-Hari, Manu A1 Sharma, Gorav A1 Snelling, Thomas A1 Soto, Alonso A1 Tagayuna, Pedrito Y A1 Tang, Amy A1 Tatem, Geneva A1 Teofili, Luciana A1 Tong, Steven Y C A1 Turgeon, Alexis F A1 Veloso, Januario D A1 Venkatesh, Balasubramanian A1 Ventura-Enriquez, Yanet A1 Webb, Steve A A1 Wiese, Lothar A1 Wikén, Christian A1 Wood, Erica M A1 Yusubalieva, Gaukhar M A1 Zacharowski, Kai A1 Zarychanski, Ryan A1 Khanna, Nina A1 Moher, David A1 Goodman, Steven N A1 Ioannidis, John P A A1 Hemkens, Lars G K1 COVID-19 K1 Convalescent plasma K1 Meta-analysis K1 SARS-CoV-2 K1 Red Andaluza de Diseño y Traslacion de Terapias Avanzadas, K1 Centro Transfusional Tejidos y Celulas de Sevilla, Sevilla AB Convalescent plasma has been widely used to treat COVID-19 and is under investigation in numerous randomized clinical trials, but results are publicly available only for a small number of trials. The objective of this study was to assess the benefits of convalescent plasma treatment compared to placebo or no treatment and all-cause mortality in patients with COVID-19, using data from all available randomized clinical trials, including unpublished and ongoing trials (Open Science Framework, https://doi.org/10.17605/OSF.IO/GEHFX ). In this collaborative systematic review and meta-analysis, clinical trial registries (ClinicalTrials.gov, WHO International Clinical Trials Registry Platform), the Cochrane COVID-19 register, the LOVE database, and PubMed were searched until April 8, 2021. Investigators of trials registered by March 1, 2021, without published results were contacted via email. Eligible were ongoing, discontinued and completed randomized clinical trials that compared convalescent plasma with placebo or no treatment in COVID-19 patients, regardless of setting or treatment schedule. Aggregated mortality data were extracted from publications or provided by investigators of unpublished trials and combined using the Hartung-Knapp-Sidik-Jonkman random effects model. We investigated the contribution of unpublished trials to the overall evidence. A total of 16,477 patients were included in 33 trials (20 unpublished with 3190 patients, 13 published with 13,287 patients). 32 trials enrolled only hospitalized patients (including 3 with only intensive care unit patients). Risk of bias was low for 29/33 trials. Of 8495 patients who received convalescent plasma, 1997 died (23%), and of 7982 control patients, 1952 died (24%). The combined risk ratio for all-cause mortality was 0.97 (95% confidence interval: 0.92; 1.02) with between-study heterogeneity not beyond chance (I2 = 0%). The RECOVERY trial had 69.8% and the unpublished evidence 25.3% of the weight in the meta-analysis. Convalescent plasma treatment of patients with COVID-19 did not reduce all-cause mortality. These results provide strong evidence that convalescent plasma treatment for patients with COVID-19 should not be used outside of randomized trials. Evidence synthesis from collaborations among trial investigators can inform both evidence generation and evidence application in patient care. PB BioMed Central Ltd. YR 2021 FD 2021-11-20 LK https://hdl.handle.net/10668/24965 UL https://hdl.handle.net/10668/24965 LA en NO Axfors C, Janiaud P, Schmitt AM, Van't Hooft J, Smith ER, Haber NA, et al. Association between convalescent plasma treatment and mortality in COVID-19: a collaborative systematic review and meta-analysis of randomized clinical trials. BMC Infect Dis. 2021 Nov 20;21(1):1170 DS RISalud RD Apr 11, 2025