MAPK1 and plasma cell myeloma: In order to find studies reporting the clinical importance of p38 expression in MM, the public database Gene Expression Omnibus (GEO), NCBI, (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE146649, 18 August 2022) was searched by using the words “multiple myeloma” and “healthy donors” and selecting “homo sapiens” in the organism filter and “expression profiling by array” as the study type.