# xili_sca_by_gene.csv
Somatic Chromosomal Alterations (SCA)
2.5M microarray copy number calles made by a custom in-house algorithm,
by Gene

For each sample and each SCA type, the number of bases of
the specified SCA type are shown per annotated gene.

# Columns:
HugoName {varchar} = Gene name
coding {bool} = T if this gene codes for a protein
DNANum {varchar} = Sample unique identifier to tie with other data tables
sca_key {varchar} = SCA type per segment, matching sca_key column in
    xili_sca.csv.  Field values are: 
        HomoDel = loss of both alleles
        Del = deletion of one allele
        cnLOH = 2 copies of only one allele
        Gain = imbalance between two alleles, where at least one allele is more
            than 1 copy
        BalGain = both alleles have same number of copies, both > 1 copy
        Del_noBAF = deletion of one allele, with insufficient BAF data to
            support, only based on intensity*
        Gain_noBAF = gain with insufficient BAF data to support, only based
            on intensity**
        *Del_noBAF and Del are combined
        **Gain and Gain_noBAF are combined
tx_coverage_percent {int} = the fraction of nucleotides in the transcripts for
    this gene covered by the sca specified in sca_key.