FSTL1 and neoplasm: As shown in Fig. 4F, NNMT+ and FSTL1+ tumor cells displayed significantly higher pro-apoptosis scores than anti-apoptosis score, while other subcluster cells displayed significantly higher anti-apoptosis scores than pro-apoptosis scores, suggesting that NNMT+ and FSTL1+ tumor cells may be susceptible to apoptosis.