I am looking for resources to download actual sequence data in terms of nucleotide arrays for certain cancer mutations. Are there any databases available to do so by filtering specific cancers and genes? I am looking for something akin to the regular vanilla NCBI website. However, the gene sequences of interest at the NCBI are not of cancer genes. For example, I can only get a regular vimentin protein sequence, not a mutated gene sequence from a specific brain glioblastoma case or a prostate cancer case, etc.
EDIT: I am an undergraduate student and I cannot access UCSC's Cancer Genomics Hub.