in order to determine whether a deregulation in the rap transcription levels could be involved per se in the multistep carcinogenic process , we chose to analyze tumors for which the ras mutation rate was previously reported to be extremely rare or unknown , i.e. , non-hodgkin 's lymphomas , certain types of carcinoma , sarcomas , germinal neoplasms of the testes and various tumors of the nervous system .
C0027651
tumors
C0027766
tumors of the nervous system