mRNA expression of ALDH1A1 in tumour samples. ALDH1A1 expression across tumor samples profiled using DNA microarrays. Log2-transformed expression levels in tumors are reported as a box plot according to histological type: SFT, solitary fibrous tumour; HPC, Haemangiopericytoma; M, meningioma; SVS, synovial sarcoma; meningeal SFT and extra-meningeal SFT. Median and ranges are indicated. *** means p < 0.001 (t-test).