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With the rapid development of precise radiotherapy technology, the use of intensity-modulated radiation therapy (IMRT) in gynecological malignant tumor has been gradually increased. IMRT could result in a good local control rate as well as superior clinical outcome in patients with cervical cancer after radical radiotherapy. The recurrence pattern of radiotherapy includes in-field recurrence, out-of-field and combined failure. The recurrence pattern of radical IMRT for cervical cancer is mainly out-of-field recurrence. Out-of-field recurrence may be related to inadequate imaging evaluation before treatment. In-field recurrence may be related to insufficient radiation dose in target area and differences of tumor sensitivity.
ABSTRACT
Objective@#The correlation between dosimetric parameters of transposed ovary and different clinical ovarian functional status was assessed in young patients with cervical cancer who needed adjuvant radiotherapy after radical resection of the ⅠB1-ⅡA2 phase of preserved and transposed ovaries.@*Methods@#The function of transposed ovary and relevant clinical symptoms in 86 patients before and 2 years after treatment between 2015 and 2017 were retrospectively analyzed, and the correlation between the dosimetric parameters and functional status of transposed ovaries during radiotherapy was evaluated. Different in vitro measures were adopted to protect the transposed ovaries during postoperative radiotherapy including 68 cases of IMRT or VMAT and 18 cases of two-dimensional and other central radiotherapy.@*Results@#The nearest distance between ovary and PTV was negatively correlated with the ovarian dose ≥V5 Gy (P=0.025). V8 Gy and Dmean were positively correlated with FSH after treatment (P=0.011, 0.020). The larger the volume of V8 Gy and the large Dmean, the higher the FSH, the worse the ovarian function. In two-dimensional technology, the ovarian dose ≥V5 Gy was significantly lower than that in three-dimensional technique. The average age of those with normal ovarian function after treatment was 33.4 years, whereas the average age of women with ovarian failure was 39.6 years (P=0.007). The number of preserved ovaries and whether synchronous chemotherapy was delivered were similar in patients with different ovarian status, which were correlated with the levels of FSH and E2 (Estradiol) before treatment, that is, the higher the level of FSH before treatment, the lower the E2 of ovarian FSH after treatment, and the higher the level of FSH after treatment, the lower the level of ovarian E2. Patients who retained their ovaries before treatment but suffered from ovarian failure received neoadjuvant chemotherapy with a slightly higher age.@*Conclusions@#Age, V8 Gy and Dmean of the transposed ovary, the shortest distance between transposed ovary and PTV, whether neoadjuvant chemotherapy was delivered before surgery and radiotherapy technique affect the protection of the function of transposed ovary.
ABSTRACT
Objective The correlation between dosimetric parameters of transposed ovary and different clinical ovarian functional status was assessed in young patients with cervical cancer who needed adjuvant radiotherapy after radical resection of the Ⅰ B1-Ⅱ A2 phase of preserved and transposed ovaries.Methods The function of transposed ovary and relevant clinical symptoms in 86 patients before and 2 years after treatment between 2015 and 2017 were retrospectively analyzed,and the correlation between the dosimetric parameters and functional status of transposed ovaries during radiotherapy was evaluated.Different in vitro measures were adopted to protect the transposed ovaries during postoperative radiotherapy including 68 cases of IMRT or VMAT and 18 cases of two-dimensional and other central radiotherapy.Results The nearest distance between ovary and PTV was negatively correlated with the ovarian dose ≥ V5 Gy (P=0.025).Vs Gy and D were positively correlated with FSH after treatment (P=0.011,0.020).The larger the volume of Vs Gy and the large D the higher the FSH,the worse the ovarian function.In two-dimensional technology,the ovarian dose ≥ V5 Gy was significantly lower than that in three-dimensional technique.The average age of those with normal ovarian function after treatment was 33.4 years,whereas the average age of women with ovarian failure was 39.6 years (P=0.007).The number of preserved ovaries and whether synchronous chemotherapy was delivered were similar in patients with different ovarian status,which were correlated with the levels of FSH and E2 (Estradiol) before treatment,that is,the higher the level of FSH before treatment,the lower the E2 of ovarian FSH after treatment,and the higher the level of FSH after treatment,the lower the level of ovarian E2.Patients who retained their ovaries before treatment but suffered from ovarian failure received neoadjuvant chemotherapy with a slightly higher age.Conclusions Age,V8 Gy and D of the transposed ovary,the shortest distance between transposed ovary and PTV,whether neoadjuvant chemotherapy was delivered before surgery and radiotherapy technique affect the protection of the function of transposed ovary.
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In recent decades,accurate radiotherapy has developed rapidly,and the application of intensity-modulated radiation therapy(IMRT)in gynecologic malignancies has increased gradually in the past ten years. Many studies have shown a high rate of occult abdominal aortic lymph node metastasis in patients with advanced cervical cancer,while pelvic and abdominal aortic lymph node status are important prognostic factors in cervical cancer patients. Conventional prophylactic extended field radiotherapy has the characteristics of severe gastrointestinal side effects,and synchronic chemotherapy is also controversial. The optimal dose of radiation therapy for metastatic pelvic and abdominal aortic lymph nodes is still controversial. This paper mainly analyzed the effect of prophylactic extended conformal radiotherapy with concurrent chemotherapy on the prognosis of cervical cancer and the dose-effect relationship of lymph node positive region.
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Objective To investigate the relationship between dose-volume histogram (DVH) parameters and the late side effects (LSE) of the rectum in external-beam radiotherapy combined with computed tomography (CT)-based brachytherapy for locally advanced cervical cancer.Methods From 2008 to 2011,18 patients with stage ⅡB-ⅢB cervical cancer received external-beam radiotherapy and CTbased brachytherapy.The DVH parameters of high-risk clinical target volume (HR CTV) D90,point A dose,and D1 cm3 and D2 cm3 of the rectum and bladder were calculated by Oncentra HDR treatment planning system.Survival outcomes were followed up and rectal LSE were evaluated by RTOG/EORTC grades.Results The point A dose and HR CTV D90 were (93.0 ± 5.5) Gy and (73.6 ± 11.9) Gy,respectively.The median follow-up was 26 months.No recurrence was found during follow-up.Eight patients had mild and moderate rectal LSE,and their rectum D2 cm3 and D1 cm3 were significantly higher than those of patients without mild and moderate rectal LSE (D2 cm3:(87.4 ± 3.8) Gy vs.(75.8 ± 7.4) Gy,P =0.004 ; D1 cm3:(96.4±6.6) Gy vs.(80.5± 7.1) Gy,P=0.001).Conclusions HR CTV D90 in CT-based brachytherapy for locally advanced cervical cancer might be lower than that in the MRI-based plan.Rectum D2 cm3 is recommended to be less than 75 Gy.