FGFR1 and neoplasm: However, only FGFR1 was expressed at high level, with a mean transcript expression of 187 RPKM in NRH-LS1 (and 143 in tumor B), compared to 0.3, 47, and 7.9 for FGFR2, FGFR3 and FGFR4, respectively.