Overexpression of circRNA051239 in EOC tissue and cells. A. Five circRNAs, circRNA051239, circRNA051238, circRNA080719, circRNA054220, and circRNA059571, were validated in EOC tissues by qRT-PCR. B. Five circRNAs, circRNA001530, circRNA400043, circRNA044097, circRNA029031, and circRNA067161, were validated in EOC tissues by qRT-PCR. C. The expression levels of exosomal circRNA051239 in plasma samples from 10 pairs of normal controls and 30 EOC patients by qRT-PCR. D. The relative expression levels of the exosomal circRNA051239 in EOC cell lines (SKOV3.ip, SKOV3, CAOV3, OVCAR3 and A2780) by qRT-PCR. E. Localization of circRNA051239 in SKOV3.ip cells by FISH. F. The subcellular location of circRNA051239. G. The expression of circRNA051239 was examined in SKOV3 cells after treatment with NC-Exo and si-circRNA051239-Exo derived from SKOV3.ip cells by qRT-PCR. Results were shown as mean ± SD. *P < 0.05, **P < 0.01.