HOXB7 and oligodendroglioma: As shown in Table 1, it is interesting to find that HOXB7 protein was negative in 20 of 22 cases of oligodendrogliomas (including WHO grade II and grade III) but in 23 cases of astrocytomas (including WHO grade II and grade III), there was a loss of HOXB7 protein expression in only 3 cases.