SNHG21 and hepatocellular carcinoma: Eventually, a seventeen-ferroptosis-associated lncRNA signature for predicting the prognosis of patients with HCC was constructed, including five low-risk genes (AC099850.1, LINC00205, AC026401.3, AC145207.8, and SNHG21) and twelve high-risk genes (POLH-AS1, SNHG10, AL139384.1, AL928654.1, AL603839.3, MKLN1-AS, AC090772.3, ZFPM2-AS1, AP001469.3, AC012073.1, AL031985.3, and LINC00942) (Supplementary Table 6).