According to the description file these should be Entrez/LocusLink gene IDs.
For instance, the first one, is LOC100130426, a hypothetical locus. This may explain why many don't have HGNC names. Check out the description in the workflow.
- gene: This is the Entrez/LocusLink gene symbol followed by the
Entrez/LocusLink gene ID.
- raw_counts: The number of reads mapping to this gene.
- median_length_normalized: This is the total aligned bases to all transcript
models associated with this gene divided by the mean transcript length.
- RPKM: See the DESCRIPTION.txt file in the mage-tab bunlde for
information on how this is calculated.