iSeqQC, an expression-based QC tool that detects outliers either produced due to variable laboratory conditions or due to dissimilarity within a phenotypic group. iSeqQC implements various statistical approaches including unsupervised clustering, agglomerative hierarchical clustering and correlation coefficients to provide insight into outliers.
http://cancerwebpa.jefferson.edu/iSeqQC/
https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-020-3399-8