Neoadjuvant brachytherapy and chemotherapy followed by radical surgery for stage IB2 and IIA cervical cancer: A retrospective comparison with chemoirradiation

Abstract

The aim of the present study was to assess the immediate and long-term results of preoperative brachytherapy and chemotherapy followed by radical surgery compared with those of standard chemoirradiation in patients with stage IB2-IIA cervical cancer. The medical records of 70 patients with stage IB2 and IIA cervical cancer who were treated between June 2006 and June 2010 were reviewed. The patients received either standard chemoirradiation (CRT) treatment (n=20) or neoadjuvant brachytherapy with one cycle of chemotherapy followed by radical hysterectomy [operation (OT) group; n=50]. Further adjuvant chemoirradiation was administered to patients with high-risk disease. Early and late complications as well as survival were compared between the two groups. No serious operative complications occurred in the OT group. In the CRT group, the incidence of symptomatic vaginal stenosis, as well as that of proctitis and cystitis, was higher compared with that in the OT group (35 vs. 4% and 20 vs. 2%, repectively). The median follow-up period was 52 months (range, 11–84 months). In the CRT group, the 3-year overall and disease-free survival rates were 95% [95% confidence interval (CI): 76.14–86.46] and 90% (95% CI: 59.94–73.66), respectively, whereas in the OT group, the respective rates were 90% (95% CI: 72.93–83.07) and 90% (95% CI: 71.84–82.96). In conclusion, the survival of patients with stage IB2-IIA cervical cancer treated with preoperative brachytherapy and chemotherapy followed by radical surgery was similar to that of patients treated with chemoirradiation, but with a more favorable side effect profile. Thus, this tri-modal treatment option requires further evaluation in prospective randomized studies.

Introduction

Cervical cancer is the second most common type of cancer worldwide and the leading cause of cancer-related mortality among women in developing countries (1). Although surgery is reserved for early-stage disease whereas locally advanced cervical cancer (LACC) is treated by chemoirradiation (CRT) (2–7), there is an increasing number of studies on multimodal treatments of LACC, including preoperative radiotherapy (RT) and chemotherapy followed by surgery (8–11). Different multimodality regimens have been suggested, including preoperative pelvic RT along with cisplatin and 5-fluorouracil (8–10), preoperative low-dose rate uterovaginal brachytherapy (9) and external pelvic CRT with low-dose cisplatin-based chemotherapy followed by brachytherapy and subsequent surgery (11). However, despite the promising results, severe side effects and a delay in definitive treatment remain a major concern. The aim of the present study was to review our experience with neoadjuvant treatment consisting of brachytherapy with one course of chemotherapy, which may be completed within 1–2 weeks, immediately followed by radical surgery. The short- and long-term outcomes of this regimen were compared with those of standard CRT in stage IB2 and IIA patients.

The present study was approved by the institutional Ethics Review Board of Tianjin Central Hospital of Obstetrics and Gynecology

Patients and methods

Patients and treatments

The present study retrospectively reviewed the medical records of all patients clinically staged as IB2 or IIA according to the International Federation of Gynecology and Obstetrics (FIGO) 2000 criteria (12) at Tianjin Central Hospital of Obstetrics and Gynecology (Nankai, China) over a 4-year period (June 2006-June 2010). All the patients were clinically staged by two gynecological oncologists and cervical biopsies were taken for histological confirmation. The patients were allocated to either the CRT group or the operation (OT) group, mainly based on age and overall medical condition. Patients in the CRT group were treated with external pelvic RT and brachytherapy with concomitant chemotherapy. A dose of 50 Gy in 26–30 fractions was delivered to the pelvis by ⁶⁰Co external-beam RT (ERT). ¹⁹²Ir intracavity brachytherapy was delivered once a week during ERT to a total dose of 30–50 Gy at point A (defined as the point of crossing of the uterine artery and ureter). ERT was omitted on the day of intracavity brachytherapy. Chemotherapy was started at the beginning of ERT. Patients either received 3–4 cycles of three-weekly cisplatin at 50 mg/m² together with 5-fluorouracil 20 mg/kg for 4 consecutive days, or cisplatin at 50 mg/m² and one dose of paclitaxel (135–175 mg/m²), based on the gynecologist's preference and the financial situation of the patient. Patients in the OT group first underwent preoperative vaginal brachytherapy twice within 1 week. The median delivered dose to the clinical target volume (1 cm from the radioactive source) was 20–24 Gy. One cycle of chemotherapy with bleomycin, vincristine and cisplatin (2 mg vincristine on the first day and a total of 50 mg/m² cisplatin in five doses over 5 consecutive days, and 15 mg bleomycin on alternate days administered in three doses) was administered either during the brachytherapy week or immediately thereafter. After neoadjuvant treatment, the patients were examined by the same two gynecologists to assess clinical response. Patients with a tumour size of <4 cm and clinical tumor improvement underwent radical hysterectomy (RH) and systematic pelvic lymph-node dissection within 3 weeks of neoadjuvant treatment. Patients not fulfilling these criteria were re-assigned to the CRT group. Postoperatively, patients with high-risk factors, including pelvic lymph node metastasis, positive resection margin or parametrial invasion, received adjuvant concurrent CRT. Patients who had ≥2 intermediate risk factors, including deep stromal invasion, defined as invasion into the cervical wall by more than half of its thickness, lymphovascular space invasion, or a tumor size of ≥4 cm, received postoperative RT alone. After completion of treatment, patients were followed up every 3 months for the first 2 years, then every 6 months for the following 3 years, and once a year thereafter, with clinical examination, cervical or vault smear, and assessment of squamous cell carcinoma antigen (SCC) antigen levels.

Statistical analysis

SPSS software version 13.0 (SPSS, Inc., Chicago, IL, USA) was used for all statistical analyses. The χ² test or Fisher's exact test were used to compare discrete variables among groups. Disease-free survival (DFS) was calculated from the date of surgery or the date of completed CRT to the date of relapse or the date of the last follow-up, and overall survival (OS) was calculated from the date of diagnosis to the date of death or the date of the last follow-up. Medians and life tables were computed using the product limit estimate by the Kaplan-Meier method, and the log-rank test was used to assess statistical significance.

Results

Patient characteristics

Between June 2006 and June 2010, a total of 70 patients were diagnosed with stage IB2 or IIA cervical cancer at Tianjin Central Hospital of Obstetrics and Gynecology (Nankai, China). The OT group included 50 patients and the CRT group 20 patients. The median follow-up period was 48 months (range, 30–72 months) for the CRT group and 54 months (range, 11–84 months) for the OT group.

The patient and tumor characteristics, including histological type, stage and grade, are summarized in Table I. There were no significant differences in age, histology or grade between the two groups; however, the OT group included a higher number of stage IB2 patients compared with the CRT group.

Table I.

Characteristics of patients in the two groups.

Characteristics	CRT, n (n=20)	OT, n (n=50)	P-value
Median age (years)	47.5	43.8	0.09
Histology			0.19
Squamous cell carcinoma	20	37
Adenocarcinoma	0	9
Adenosquamous carcinoma	0	2
Other	0	2
Stage			<0.01
IB2	3	33
IIA	17	17
Grade			0.10
I	0	9
II	12	21
III	8	20

CRT, chemoradiotherapy group; OT, operation group.

Surgery

A total of 50 patients underwent Piver type III RH and pelvic lymphadenectomy. Bilateral salpingo-oophorectomy was performed in 9 patients with adenocarcinoma of the cervix and in 16 patients with SCC (menopause), 2 patients with adenosquamous carcinoma and 2 patients with sarcoma. Ovarian transposition was performed in 21 patients with SCC. Pelvic lymphadenectomy included the external iliac, internal iliac, obturator and common iliac lymph nodes.

The median interval between preoperative therapy and surgery was 25.8 days (range, 15–50 days). Intra- and postoperative complications were evaluated in all surgical patients. The median operative time was 195 min (range, 110–285 min) and the median blood loss was 583 ml (range, 200–1,400 ml). Of the 50 patients, 14 (28%) suffered an estimated blood loss of >800 ml during surgery and were transfused. The median duration of hospital stay was 7 days (range, 4–18 days). The surgical specimens of 7 patients (14%) contained no tumor following neoadjuvant CRT, while residual tumors were found in the surgical specimens of 43 patients (86%). Among patients with residual tumors, 42 (98%) had a residual tumor in the cervix and 1 patient (2%) had a residual tumor in the vagina alone. Among all patients in the OT group, 12 (24%) had pelvic lymph node involvement, of whom 2 (4%) also had parametrial invasion. The pathological results of the patients in the OT group are summarized in Table II.

Table II.

Pathology results of patients in the operation group (n=50).

Pathology result	n (%)
Residual tumor	43 (86)
Squamous cell carcinoma	31
Adenocarcinoma	8
Adenosquamous carcinoma	2
Other (sarcoma)	2
Parametrial invasion	2 (4)
Positive lymph nodes	12 (24)
Positive vaginal margin	1 (2)
≥2 intermediate risk factors	23 (46)
Deep stromal invasion	20 (40)
Lymphovascular space invasion	13 (26)
Tumor size ≥4 cm	42 (84)

Postoperative therapy

A total of 26 patients received postoperative therapy. A total of 13 patients (26%) with pelvic lymph node involvement, parametrial invasion and positive vaginal margin received concurrent CRT, among whom 6 received cisplatin (50 mg/m²) with 5-fluorouracil (20 mg/kg) daily for 4 days, repeated twice with a 21-day interval, 5 received paclitaxel (135–175 mg/m²) and cisplatin (50–60 mg/m²), and 2 patients were treated with docetaxel (60 mg/m²) and carboplatin (area under the curve 4) for 4–6 cycles. Standard-field ERT was administered for 4–6 weeks after surgery to a total dose of 40 Gy. Among these patients, 1 (2%) received a parametrial boost to a total of 50 Gy due to a positive vaginal margin and 2 patients (4%) received extended-field ERT due to common iliac lymph node involvement. All the patients completed their prescribed treatment.

Additional ERT was administered to 13 patients (26%) with ≥2 intermediate risk factors. The median time interval between surgery and RT was 40 days (range, 30–46 days). The median delivered dose to the pelvis was 40 Gy (range, 30–50 Gy) for the standard field; 2 of those patients did not complete the treatment against doctors' recommendations.

Complications

Early complications, defined as those occurring within 2 months after surgery, developed in 9 patients (18%). Among those, 4 patients had fever >38°C for >2 days, 4 patients had urine retention requiring catheterization for >2 weeks, and 1 patient had thrombophlebitis. As regards late complications, the CRT group exhibited a higher frequency of symptomatic vaginal stenosis, as well as proctitis and cystitis (35 vs. 4% and 20 vs. 2%, respectively) compared with the OT group. Grade 3–4 myelosuppression and lymphedema were similar between the two groups. The late complications of the CRT and OT groups are listed in Table III.

Table III.

Late complications in the chemoradiotherapy (CRT) and operation (OT) groups.

Late complications	CRT, n (%) (n=20)	OT, n (%) (n=50)	P-value
Grade 3–4 myelosuppression	2 (10)	2 (4)	0.572
Proctitis and cystitis	5 (20)	1 (2)	0.006
Ureterohydronephrosis	0 (0)	1 (2)	1.000
Lymphedema	2 (10)	3 (6)	0.619
Symptomatic vaginal stenosis	7 (35)	2 (4)	0.002

A subgroup analysis of stage IIA patients (n=17 in each group) revealed that the rate of complications in the CRT group was higher compared with that in the OT group (P=0.037; Table IV).

Table IV.

Late complications of stage IIA patients in the chemoradiotherapy (CRT) and operation (OT) groups.

Late complications	CRT, n (%) (n=17)	OT, n (%) (n=17)	P-value
Grade 3–4 myelosuppression	1 (5.9)	1 (5.9)	0.037
Proctitis and cystitis	3 (17.6)	0 (0)
Ureterohydronephrosis	0 (0)	0 (0)
Lymphedema	1 (5.9)	2 (11.8)
Symptomatic vaginal stenosis	5 (29.4)	1 (5.9)

Follow-up

As of June 2013, the median duration of follow-up was 52 months (range, 11–84 months) in the entire patient cohort, 49 months (range, 30–72 months) in the CRT group and 54 months (range, 11–84 months) in the OT group. All the patients were followed up for at least 3 years. In the OT group, 5 patients (10%) developed recurrence. Among them, 1 patient had a vaginal recurrence after 29 months. One patient with cervical sarcoma had pelvic metastasis within 2 years after treatment. Another patient had parametrial recurrence 26 months later and succumbed to disease progression; this patient exhibited a poor response to neoadjuvant CRT and did not complete the postoperative ERT. One patient suffered a metastatic relapse 6 months later, affecting the pelvis and lung, and succumbed to the disease within 1 year; this patient exhibited parametrial and pelvic lymph node involvement. Another patient developed recurrence near the ureter and sigmoid colon after 5 months and succumbed to the disease; this patient had not received any postoperative therapy due to the absence of risk factors. The 3-year overall and disease-free survival rates in the OT group were 90% [95% confidence interval (CI): 72.93–83.07] and 90% (95% CI: 71.84–82.96), respectively (Figs. 1 and 2).

Figure 1.

Overall survival curves for patients in the CRT and OT groups. CRT, chemoradiotherapy group; OT, operation group; Cum, cumulative.

Figure 2.

Disease-free survival curves for patients in the CRT and OT groups. CRT, chemoradiotherapy group; OT, operation group; Cum, cumulative.

In the CRT group, 2 patients (10%) suffered a relapse: In 1 patient the relapse affected the pelvic lymph nodes, while the other patient developed extensive disease (affecting the pelvic lymph nodes, lung and supraclavicular lymph nodes). In the CRT group, the 3-year overall survival and disease-free survival rates were 95% (95% CI: 76.14–86.46) and 90% (95% CI: 59.94–73.66), respectively (Figs. 1 and 2).

In the subgroup of patients with stage IIA disease, 1 patient in the CRT group and 2 patients in the OT group suffered a recurrence and succumbed to the disease. There was no statistically significant difference in survival between the two groups.

Discussion

Early-stage cervical cancer is commonly treated by surgery alone. For patients with FIGO stage IB2-IVA disease, also referred to as LACC, the preferred therapy is concurrent CRT. The use of a three-modality treatment, including RT, chemotherapy and surgery, has been reported as early as 1994 (13,14). Recent studies on preoperative chemotherapy and/or RT have shown promising results, including better local control and overall survival, while reducing short- and long-term complications, resulting in a better quality of life (8,11,15–19). Another advantage of neoadjuvant treatment is that the response in the post-neoadjuvant biopsy sample may also identify patients who are more suitable for definitive CRT rather than surgery. For example, patients insensitive to neoadjuvant CRT were not considered suitable for RH due to the higher likelihood of high-risk factors, as they would have required further adjuvant chemotherapy or RT, which may have increased the occurrence of complications.

The present study used a three-modality treatment strategy comprising RT, chemotherapy and surgery for patients with stage IB2-IIA cervical cancer in an attempt to improve the overall and disease-free survival and reduce the requirement for adjuvant therapy, thereby minimizing complications.

The overall survival and disease-free survival rates of the present study were similar between the two groups. The 3-year disease-free survival rate of 90% and OS rate of 91% observed in the entire cohort were encouraging when compared with the survival rate of 83% reported by previous studies (20–23). The results of the present study were also comparable to those of Ferrandina et al (8), who achieved local and distant control rates of 93 and 92%, respectively, in patients with stage IB2-II over a similar follow-up time. The recurrence rate in the present study was 10% in each group. This result is comparable with that of a previous study, which reported a local recurrence rate of 16% in patients with stage IB and II disease treated with RT alone (n=171) or surgery (n=172) (22). At present, the study by Landoni et al (22) is the only single randomized controlled trial on patients with early-stage cervical cancer comparing RH followed by tailored adjuvant therapy with primary RT.

With regard to the possible worsening of survival and recurrence rates with a longer follow-up period, it is important to consider that 88% of recurrences/progressions in the present study occurred within the first 2 years, which is in accordance with previous reports (8,24). In the present study, all the patients were followed up for at least 3 years and >70% of patients were followed up for >4 years.

The complications were similar between the CRT and OT groups in terms of grade 3–4 myelosuppression (10 vs. 4%, respectively), ureterohydronephrosis (0 vs. 2%, respectively) and lymphedema (10 vs. 6%, respectively). However, in the CRT group, symptomatic vaginal stenosis, as well as proctitis and cystitis, were significantly more frequent compared with the OT group (35 vs. 4% and 20 vs. 2%, respectively). Landoni et al (22) reported late complications in 16% of the patients treated exclusively with RT and in 29% of those treated with surgery and adjuvant RT. Among the patients with stage IB2 tumors, 84% required adjuvant RT due to high-risk characteristics. By contrast, in the present study, only 50% of the patients in the OT group required adjuvant RT. The lower number of patients requiring adjuvant RT in the present study may have been due to the reduction of risk factors by preoperative CRT. In the present study, preoperative CRT included only one cycle of cisplatin, vinblastine and bleomycin chemotherapy and vaginal brachytherapy (20–24 Gy), which had few complications.

Various neoadjuvant treatments, including chemotherapy alone, RT alone and CRT, have been applied to patients with LACC (8–11,25–27). In the present study, neoadjuvant CRT was used. However, instead of the commonly used ERT, brachytherapy was used in the OT group, as it has been shown to provide local control with fewer complications (28–30).

The use of neoadjuvant chemotherapy has also been reported. Compared with RT treatment alone, the 5-year overall survival rate of patients subjected to neoadjuvant chemotherapy followed by surgery was 15% increased (25). A Cochrane meta-analysis revealed that progression-free survival was significantly improved by neoadjuvant chemotherapy followed by surgery compared with surgery alone; however, there was no overall survival benefit (27).

The aim of preoperative brachytherapy and chemotherapy is to decrease the size of the tumor in order to improve the feasibility of the operation. RT decreases the size of most tumors and facilitates resection with clear margins, while preoperative chemotherapy may decrease high-risk factors, such as lymphovascular involvement, reducing the requirement for adjuvant therapy and thereby minimizing the occurrence of complications (31). In the present study, the median time from neoadjuvant treatment to surgery was 25 days, which did not cause any significant delay to definitive treatment.

Radical surgery after CRT has been shown to reduce the rate of local recurrence (18,32) and to improve the prognosis for patients with bulky residual tumors (33). Pathological assessment of surgical specimens allows for the identification of patients with poor response to CRT and also provides important prognostic information to guide the adjuvant therapy (14,32,33).

In the present study, neoadjuvant CRT with brachytherapy followed by RH achieved good control of stage IB2 and IIA cervical cancer accompanied with a low incidence rate of complications compared with CRT alone. Although the present study was a retrospective analysis of a relatively small patient cohort and the chemotherapy regimen was somewhat heterogenous, it is one of few studies using brachytherapy instead of ERT for neoadjuvant CRT (9,34,35). There were no significant differences in survival between the OT and CRT groups. A possible limitation of the present study was that the median follow-up duration was only 52 months. However, since most recurrences occurred within the first 24 months, a longer follow-up may yield the same outcome. Another limitation of the present study was the significant difference in stage distribution between the two groups. A subgroup analysis of stage IIA patients also demonstrated that the complication rates were lower in the OT group. However, there was no difference in OS between the OT and CRT groups.

In conclusion, the present study demonstrated that neoadjuvant CRT may reduce the tumor volume in a proportion of stage IB2-IIA patients, enabling them to undergo definitive surgery rather than definitive CRT, with a reduced incidence of long-term complications and similar overall survival compared with patients receiving CRT alone. A larger randomized trial with a standardized chemotherapy regimen and longer follow-up is required to confirm these results.