AUTHOR=Botta Cirino , Martino Enrica Antonia , Conticello Concetta , Mendicino Francesco , Vigna Ernesto , Romano Alessandra , Palumbo Giuseppe Antonio , Cerchione Claudio , Martinelli Giovanni , Morabito Fortunato , Di Raimondo Francesco , Gentile Massimo TITLE=Treatment of Lenalidomide Exposed or Refractory Multiple Myeloma: Network Meta-Analysis of Lenalidomide-Sparing Regimens JOURNAL=Frontiers in Oncology VOLUME=11 YEAR=2021 URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2021.643490 DOI=10.3389/fonc.2021.643490 ISSN=2234-943X