Stages IIB, III, and IVA Cervical Cancer Treatment
Standard Treatment Options for Stages IIB, III, and IVA Cervical Cancer
Radiation therapy with concomitant chemotherapy
Lymph Node Management
Other Treatment Options
Current Clinical Trials
Standard Treatment Options for Stages IIB, III, and IVA Cervical Cancer
The size of the primary tumor is an important prognostic factor and should be carefully evaluated in choosing optimal therapy. Survival and local control are better with unilateral rather than bilateral parametrial involvement. Patterns-of-care studies in stages IIIA and IIIB patients indicate that survival is dependent on the extent of the disease, with unilateral pelvic wall involvement predicting a better outcome than bilateral involvement, which in turn predicts a better outcome than involvement of the lower third of the vaginal wall. These studies also reveal a progressive increase in local control and survival paralleling a progressive increase in paracentral (point A) dose and use of intracavitary treatment. The highest rate of central control was seen with paracentral (point A) doses of more than 85 Gy.Radiation therapy with concomitant chemotherapy
Strong consideration should be given to the use of intracavitary radiation therapy and external-beam radiation therapy (EBRT) to the pelvis combined with cisplatin or cisplatin/fluorouracil (5FU).[5-12]
Evidence (radiation therapy with concomitant chemotherapy):
- Five randomized, phase III trials have shown an overall survival (OS) advantage for cisplatin-based therapy given concurrently with radiation therapy,[5-10] but one trial that examined this regimen demonstrated no benefit. The patient populations in these studies included women with Féderation Internationale de Gynécologie et d’Obstétrique (FIGO) stages IB2 to IVA cervical cancer treated with primary radiation therapy, and women with FIGO stages I to IIA disease who, at the time of primary surgery, were found to have poor prognostic factors, including metastatic disease in pelvic lymph nodes, parametrial disease, and positive surgical margins.
- Although the positive trials vary somewhat in terms of the stage of disease, dose of radiation, and schedule of cisplatin and radiation, the trials demonstrate significant survival benefit for this combined approach.
- The risk of death from cervical cancer was decreased by 30% to 50% with the use of concurrent chemoradiation therapy.
Evidence (low-dose rate vs. high-dose rate intracavitary radiation therapy):
- Although low-dose rate (LDR) brachytherapy, typically with cesium Cs 137, has been the traditional approach, the use of high-dose rate (HDR) therapy, typically with iridium Ir 192, is rapidly increasing. HDR brachytherapy provides the advantage of eliminating radiation exposure to medical personnel, a shorter treatment time, patient convenience, and improved outpatient management. The American Brachytherapy Society has published guidelines for the use of LDR and HDR brachytherapy as a component of cervical cancer treatment.[14,15]
- In three randomized trials, HDR brachytherapy was comparable with LDR brachytherapy in terms of local-regional control and complication rates.[16-18][Level of evidence: 1iiDii]
- In an attempt to improve upon standard chemoradiation, a phase III randomized trial compared concurrent gemcitabine plus cisplatin and radiation therapy followed by adjuvant gemcitabine and cisplatin (experimental arm) with concurrent cisplatin plus radiation (standard chemoradiation) in patients with stages IIB to IVA cervical cancer.[Level of evidence: 1iiA] A total of 515 patients from nine countries were enrolled. The schedule for the experimental arm was cisplatin (40 mg/m2) and gemcitabine (125 mg/m2) weekly for 6 weeks with concurrent EBRT (50.4 Gy in 28 fractions) followed by brachytherapy (30–35 Gy in 96 hours) and then two adjuvant 21-day cycles of cisplatin (50 mg/m2) on day 1 plus gemcitabine (1,000 mg/m2) on days 1 and 8. The standard arm was cisplatin (40 mg/m2) weekly for 6 weeks with concurrent EBRT and brachytherapy as described for the experimental arm.
- The primary endpoint was progression-free survival (PFS) at 3 years; however, the study found improvement in the experimental arm for PFS at 3 years (74.4%; 95% confidence interval [CI], 68%–79.8% vs. 65.0%; 95% CI, 58.5%–70.7%); overall PFS (hazard ratio [HR], 0.68; 95% CI, 0.49–0.95); and OS (HR, 0.68; 95% CI, 0.49–0.95). Patients in the experimental arm had increased hematologic and nonhematologic grade 3 or 4 toxic effects, and two deaths in the experimental arm were possibly related to treatment.
A subgroup analysis showed an increased benefit in patients with a higher stage of disease (stages III–IVA vs. stage IIB), which suggested that the increased toxic effects of the experimental protocol may be justified for these patients. Additional investigation is needed to determine which aspect of the experimental arm led to improved survival (i.e., the addition of the weekly gemcitabine, the adjuvant chemotherapy, or both) and to determine quality of life during and after treatment, a condition that was omitted from the protocol.
The addition of adjuvant chemotherapy following chemoradiation therapy is currently being evaluated as part of a large multinational clinical trial. The OUTBACK trial (NCT01414608) is randomly assigning women to receive cisplatin (40 mg/m2 weekly for 5 doses) with whole-pelvic radiation therapy (standard chemoradiation therapy) with or without standard chemoradiation therapy plus adjuvant carboplatin (AUC 5 + paclitaxel 155 mg/m2).Lymph Node Management
Patients who are surgically staged as part of a clinical trial and are found to have small-volume para-aortic nodal disease and controllable pelvic disease may be cured with pelvic and para-aortic radiation therapy. Treatment of patients with unresected periaortic nodes with extended-field radiation therapy leads to long-term disease control in patients with low-volume (<2 cm) nodal disease below L3. A single study (RTOG-7920) showed a survival advantage in patients who received radiation therapy to para-aortic nodes without histologic evidence of disease. Toxic effects are greater with para-aortic radiation than with pelvic radiation alone but were mostly confined to patients with previous abdominopelvic surgery.
If postoperative EBRT is planned following surgery, extraperitoneal lymph–node sampling is associated with fewer radiation-induced complications than a transperitoneal approach. Patients who underwent extraperitoneal lymph–node sampling had fewer bowel complications than those who had transperitoneal lymph–node sampling.[22,24,25]
The resection of macroscopically involved pelvic nodes may improve rates of local control with postoperative radiation therapy. In addition, prospective data points to improvement in outcomes for patients who undergo resection of positive para-aortic lymph nodes before curative intent chemoradiation therapy; however, only patients with minimal nodal involvement (<5mm) benefited.Other Treatment Options Interstitial brachytherapy
For patients who complete EBRT and have bulky cervical disease such that standard brachytherapy cannot be placed anatomically, interstitial brachytherapy has been used to deliver adequate tumoricidal doses with an acceptable toxicity profile.Neoadjuvant chemotherapy
Several groups have investigated the role of neoadjuvant chemotherapy to convert patients who are conventional candidates for chemoradiation into candidates for radical surgery.[29-33] Multiple regimens have been used; however, almost all utilize a platinum backbone. The largest randomized trial to date was reported in 2001, and its accrual was completed before the standard of care included the addition of cisplatin to radiation therapy. As a result, although there was an improvement in OS for the experimental arm, the results are not reflective of current practice. This study accrued patients with stages IB through IVA disease, but improvement in the experimental arm was only noted for participants with early stage disease (stages IB, IIA, or IIB).
EORTC-55994 (NCT00039338) randomly assigned patients with stages IB2, IIA2, and IIB cervical cancer to standard chemoradiation or neoadjuvant chemotherapy (with a cisplatin backbone for three cycles) followed by evaluation for surgery. With OS as the primary endpoint, this trial may delineate whether there is a role for neoadjuvant chemotherapy for this patient population.Current Clinical Trials
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with stage IIB cervical cancer. The list of clinical trials can be further narrowed by location, drug, intervention, and other criteria.
General information about clinical trials is also available from the NCI Web site.References
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