SMIM30 and triple-negative breast carcinoma: There are many other examples of microprotein encoding mRNAs misclassified as non-coding; a 46-amino acid microprotein, myoregulin encoded by LINC00948 (Anderson et al., 2015); the 7-kilodalton microprotein, non-annotated P-body dissociating polypeptide (NoBody) encoded by LINC01420 (D’Lima et al., 2017); the microprotein, CIP2A-BP encoded by LINC00665 that inhibits triple negative breast cancer progression (Guo et al., 2020), and the small endogenous peptide, SMIM30, which promotes hepatocellular cancer tumorigenesis, encoded by LINC00998 (Pang et al., 2020) to name a few.