Objective To investigate the molecular mechanism of retinoic acid in targeted treatment of craniopharyngioma by detecting the expression of RARαand PPARβ/δin craniopharyngioma cells and analyzing the correlation between the expression and effect of retinoic acid. Methods The expression of RARα and PPARβ/δ in craniopharyngioma cells from 31 patients cultured in vitro was quantified by reverse transcription-PCR. The inhibition rates of RA on craniopharyngioma with different expression of RARα and PPARβ/δ were detected by using MTT assay, and the correlation between the expression of RARα and PPARβ/δand the effect of RA was analyzed. Results 1. The RT-PCR results showed that the expression levels of PPARβ/δand RARα mRNA were different. Craniopharyngioma cells from 31 patients in primary culture were divided into three groups according the expression levels of nuclear receptor: PPARβ/δ>RARα group, RARα>PPARβ/δ group and RARα>>PPARβ/δ group. 2.MTT results showed that the inhibition rate of RARα>>PPARβ/δgroup was significantly higher than the other groups under same drug, the differences had statistical significance ( <0.01) . Conclusions The expression of PPARβ/δ, RARα can be used to evaluate the effect of RA in treatment of craniopharyngioma. The craniopharyngioma with low-expression of PPARβ/δ is more sensitive to RA. Targeting higher RARα or targeting lower PPARβ/δ is beneficial to the treatment of craniopharyngiomas.

Objective To investigate the prognostic value of pretreatment 18F-fluorodeoxyglucose (FDG) PET/CT imaging on extranodal nasal type natural killer/T-cell lymphoma (ENKTL).Methods Thirtyfive patients (20 males,15 females,average age 45 years) diagnosed as Ann Arbor stage Ⅰ-Ⅱ ENKTL from February 2013 to February 2016 were retrospectively analyzed.All patients were pathologically confirmed and underwent 18F-FDG PET/CT before treatment.The maximum standardized uptake value (SUVmax),international prognostic index score (IPI),serum lactate dehydrogenase (LDH),and immunohistochemical results were recorded.Patients were followed up for 2 years.The relationships between SUVmax,progression-free survival (PFS),pathological features and IPI were assessed using Fisher exact test.Results There were 18 ENKTL patients with progression,and 17 had no progression.Patients with SUVmax ≥ 12.2 had worse prognosis than those with SUVmax＜ 12.2 (P =0.001).There were correlations between SUVmax and Ki-67 (r=0.701,P=0.001),SUVmax and CD56 (r=0.393,P=0.032),SUVmax and IPI (r=0.787,P＜0.01),respectively.It was also found that SUVmax,Ki-67,CD56 and IPI were related to PFS (all P＜0.05).Conclusion SUVmax of 18F-FDG could be used as an important prognostic indicator for early ENKTL.