This article describes about OASIS 1.0, the central repository and web-based anal. platform used for exploring cancer multi-omics data.The OASIS web portal contains sample-level annotations and gene-level mutation, copy number variation (CNV) and expression data on 12,108 primary tumors, 13,007 normal samples and 1,054 cell lines across 55 cancers and 43 tissues from TCGA, CCLE and GTEx datasets.Based on the open-source BioMart framework, the OASIS web portal provides a suite of easy-to-use anal. features to help wet-lab biologists to perform exploratory anal. of the data.Bar plot anal. confirms that CDK4 is amplified at high amplitude in about 13 percent of TCGA glioblastoma tumors, while Scatter plot anal. indicates that CDK4 amplification induces over-expression in cells.OASIS aggregated a large compendium of RNA-seq data on 12,056 samples derived from tumors, normal tissues and cell lines and provided tools such as Box plot and Volcano plot to perform versatile gene expression anal. within and across datasets.For target validation and pharmacol. testing OASIS-print was used to identify cell lines harboring amplifications in CDK4 with wild-type RB1.It was concluded that combining one of the largest repositories of multi-omics datasets on the web with intuitive analytics, OASIS provided a powerful resource to the cancer research community.