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ORIGINAL ARTICLE
Year : 2006  |  Volume : 43  |  Issue : 3  |  Page : 117-121
 

Neoadjuvant chemotherapy followed by surgical cytoreduction in advanced epithelial ovarian cancer


1 Department of Surgical Oncology, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
2 Department of Medical Oncology, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India

Correspondence Address:
SVS Deo
Department of Surgical Oncology, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0019-509X.27933

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 » Abstract 

AIMS: To study the role of neoadjuvant chemotherapy (NACT) followed by surgical cytoreduction in the management of advanced epithelial ovarian cancers. MATERIALS AND METHODS: A retrospective analysis of 82 patients with advanced epithelial ovarian cancers (stage IIIC and IV) who were treated with NACT followed by surgical cytoreduction between 1995 and 2004 was performed. Response to NACT, optimal cytoreduction rate, disease-free survival and overall survival were analyzed. RESULTS: There were 59 patients (72%) with stage IIIC disease and 23 (28%) with stage IV disease. Diagnosis was established by imaging, ascitic fluid cytology and CA-125 estimations in 75% and by laparotomy in 25% of the patients. After NACT, complete response occurred in 17 patients (20.7%), 50 (61.0%) had partial response and no response was documented in 15 (18.3%) patients. Optimal surgical cytoreduction could be achieved in 72% of the patients. At the median follow-up of 34 months (range 6-102 months), 5-year disease-free and overall survivals were 31 and 32% respectively. The median disease free interval was 25.4 months. On multivariate analysis, degree of optimal cytoreduction was the only factor ( P <0.05) affecting survival. CONCLUSIONS: NACT followed by surgical cytoreduction is a promising treatment strategy for the management of advanced epithelial ovarian cancers. A significant number of patients exhibit response to NACT. Downstaging following NACT leads to higher optimal cytoreduction rates and improved survival in comparison to historical controls.


Keywords: Advanced ovarian cancer, neoadjuvant chemotherapy, surgical cytoreduction


How to cite this article:
Deo S, Goyal H, Shukla N K, Raina V, Kumar L, Srinivas G. Neoadjuvant chemotherapy followed by surgical cytoreduction in advanced epithelial ovarian cancer. Indian J Cancer 2006;43:117-21

How to cite this URL:
Deo S, Goyal H, Shukla N K, Raina V, Kumar L, Srinivas G. Neoadjuvant chemotherapy followed by surgical cytoreduction in advanced epithelial ovarian cancer. Indian J Cancer [serial online] 2006 [cited 2019 Sep 16];43:117-21. Available from: http://www.indianjcancer.com/text.asp?2006/43/3/117/27933



 » Introduction Top


Ovarian cancer is the fifth most common cancer among women with a lifetime risk of about 1 in 70. Ovarian cancer ranks fourth in cancer deaths among women, accounting for more deaths than any other cancer of the female reproductive system.[1],[2],[3],[4] Due to nonspecific symptoms, diagnosis is frequently delayed and nearly 70% have advanced disease (stage III or IV) at the time of presentation.[5] Advanced ovarian cancer is a disease associated with poor prognosis, with the 5-year survival ranging from 5-25%.[2],[5],[6],[7] The standard management of advanced disease has so far been surgical staging and debulking followed by adjuvant chemotherapy.[8] Optimal cytoreduction during initial surgery is an important prognostic indicator, resulting in survival advantage to optimally cytoreduced patients.[9],[10] However, optimal cytoreduction is feasible in only 40-50% of patients with advanced ovarian cancer.[11],[12] Ovarian cancer is a chemo-sensitive tumor and majority of the patients receive adjuvant chemotherapy. Recently, neoadjuvant chemotherapy (NACT) has been advocated for patients with advanced ovarian cancer with an aim to improve resectability rates and survival.[13],[14],[15],[16] Till now there are no definite guidelines regarding the role of NACT in advanced ovarian cancer. In this study, we have reviewed our experience of neoadjuvant chemotherapy followed by surgical cytoreduction in 82 patients with advanced epithelial ovarian cancer.


 » Materials and Methods Top


A retrospective analysis of a prospective ovarian cancer database of the Department of Surgical Oncology was performed. Eighty-two patients with advanced epithelial ovarian cancers treated with NACT followed by surgical cytoreduction between 1995 and 2004 were included in the analysis. All patients with Stage IV disease and stage IIIC with large volume ascites (>500 ml), extensive peritoneal disease not amenable for optimal cytoreduction and patients considered unresectable by the treating surgical team were subjected to NACT followed by surgical cytoreduction after obtaining an informed consent. Patients who had significant primary surgical cytoreduction (any cytoreductive procedure other than exploratory laparotomy and biopsy) elsewhere were excluded from the study. Diagnosis was established by CECT of the abdomen, ascitic fluid cytology and CA-125 estimation in 61 patients (75%) and by laparotomy in 21 (25%) patients. Radiological criteria as described in earlier studies[14],[17],[18] for staging advanced disease - presence of large (>5 cm) omental caking, diffuse peritoneal deposits, large volume ascites, large abdominal mass (>5 cm) and contiguous organ involvement-were followed. After obtaining an informed consent, patients were subjected to NACT followed by surgical cytoreduction. NACT comprised of 3-5 (mean 4) cycles of platinum-based chemotherapy during initial phase and taxane-based chemotherapy during the later phase of the study. Fifty-two patients (65.7%) received CAP regime (cisplatin 50 mg/m 2, adriamycin 50 mg/m 2 and cyclophosphamide 500 mg/m 2) I.V. three weekly cycles and the remaining 30 patients (34.3%) received PC regime (paclitaxel 175 mg/m 2 and carboplatin 300 mg/ m 2) I.V. three weekly injections. In the initial part of study patients received CAP regimen while in the latter part, majority of the patients received PC regimen.

Response to NACT was assessed clinically, radiologically and by CA-125 estimations. Thereafter, patients underwent surgical cytoreduction. Standard surgical procedure involved peritoneal washings, total abdominal hysterectomy, bilateral salpingo-oophorectomy, total omentectomy and peritoneal biopsies. An attempt was made to achieve maximal surgical cytoreduction. Optimal cytoreduction was defined for this study purpose as residual disease less than 1 cm in the largest diameter.[9] Extended resections including gut resections were performed if their removal resulted in optimal surgical cytoreduction. Only retroperitoneal nodal sampling was done and no formal retroperitoneal lymph node dissection was performed. All patients were subjected to three cycles of postoperative adjuvant chemotherapy with the same agents used for NACT and in the same dosages except in cases of poor response, when alternative chemotherapeutic agents were used based on the treating physician's preference. At the completion of adjuvant chemotherapy, patients were again reassessed clinically, radiologically and by CA-125 estimations to determine the disease status at the completion of treatment. Patients with residual / progressive disease were offered second-line chemotherapy. Patients were kept on regular follow-up. Follow-up evaluations included history and clinical examination every 3 months and CA-125 and CT scan every 6 months.

An analysis of patient and disease profiles, response to NACT, optimal surgical cytoreduction rates and disease-free and overall survival was performed. Univariate and multivariate analyses of factors affecting survival were performed using Cox regression. Kaplan Meier method was used for survival analysis. SPSS 10.0 was used as statistical tool for the study.


 » Results Top


Totally there were 82 patients with a mean age of 49.9 years (range 32-72 years). Fifty-nine patients (72%) had stage IIIC and 23 patients (28%) had stage IV disease (pleural effusion). Twenty-seven (32.9%) patients were premenopausal, while the rest were postmenopausal. The median duration of symptoms was 3 months (range 0.5-12 months). Grade I-III gastrointestinal and hematological toxicities occurred in 40% patients, while no patient had grade IV toxicity. The overall response to NACT was 81.7%. Seventeen patients (20.7%) had complete response and 50 (61.0%) had partial response and no response was documented in 15 (18.3%) patients.

Optimal surgical cytoreduction could be achieved in 59 out of 82 patients (72%). Fifteen patients (18.2%) had suboptimal surgical cytoreduction and in 8 (9.8%) patients exploratory laparotomy and closure was performed in view of frozen pelvis. Gut resection was required in only 6 (7.3%) patients (large bowel - 3; small bowel - 3). Mean hospital stay was 4 days (range 2-30 days). Postoperative complications occurred in 4 patients (4.9%) - in the form of wound infections in 3 and pancreatic fistula in 1 patient. After completion of postoperative adjuvant chemotherapy, 61 patients (74.4%) attained disease-free status, while 21 patients (25.6%) had residual disease and were switched over to second-line chemotherapy. At a median follow-up of 34 months (range 6-102 months), 5-year disease-free and overall survival were 31 and 32% respectively [Figure - 1][Figure - 2]. The median disease-free interval was 25.4 months. Univariate analysis for survival identified response to NACT, degree of surgical cytoreduction and disease status at completion of treatment as significant factors. Other factors like age, stage of disease, menopausal status, type of chemotherapy received did not influence survival. On multivariate analysis, only degree of optimal surgical cytoreduction emerged as an independent prognostic factor for survival. The median survival in patients with optimal cytoreduction was 41.4 months (C.I. 26.3-56.4 months) while that in patients without optimal cytoreduction was 26.2 months (C.I. 18.7-33.7 months) ( P =0.02).


 » Discussion Top


Advanced epithelial ovarian cancer continues to be a disease with bad prognosis and high mortality.[2],[5],[6],[7] The standard management of advanced ovarian cancer is surgical debulking followed by adjuvant chemotherapy.[8] Prognosis largely depends upon the degree of cytoreduction achieved during primary surgery. Gross residual disease more than 2 cm carries poor prognosis, as shown in the meta-analysis by Bristow et al.[9],[10] Most people today accept optimal cytoreduction as residual tumor volume of <1 cm or even <0.5 cm. However, due to bulky disease in advanced ovarian cancer, optimal cytoreduction is possible in only 40 to 50% of the patients.[11],[12] Hence efforts are being made to increase the optimal surgical cytoreduction rates in order to improve survival. NACT is emerging as an effective treatment modality in many locally advanced solid tumors, including breast, gastrointestinal and bone and soft tissue tumors. The rationale behind NACT protocol is to make inoperable advanced disease operable, increase R0 resection rates and facilitate organ conservation. Since ovarian cancer is a chemo-sensitive disease where effective chemotherapeutic agents like platinum and taxane group of drugs are available, conceptually, the use of neoadjuvant chemotherapy may decrease the tumor burden and allow a higher optimal surgical cytoreduction rate and an improvement in overall survival.

Since the staging of ovarian cancer is essentially surgical, selection of locally advanced disease for neoadjuvant protocols becomes difficult. Many studies have shown good correlation between radiological and surgical staging, especially in advanced disease.[19],[20] Qayyum et al[21] have shown a positive predictive value of 94% using CT scan for suboptimal cytoreduction in advanced ovarian cancer. CT scan was used in the current study for staging advanced ovarian cancer in majority of the patients and laparotomy was required for diagnosis and staging only in 25% of patients.

Ovarian cancer is a chemo-sensitive disease and a number of cytotoxic agents have activity against it. They include the platinum compounds, the alkylating agents, the anthracyclines, paclitaxel oral etoposide, topotecan, gemcitabine, navelbine, doxil and hexamethylmelamine.[22] A number of trials[23],[24],[25] have compared platinum-containing combinations to nonplatinum-containing regimens and have found them to be superior. Recently, a prospective randomized trial by GOG[26] comparing 'cisplatin plus cyclophosphamide' with 'cisplatin plus paclitaxel' showed a significantly higher response rate in the paclitaxel group and established 'platinum plus taxane' based chemotherapy as the preferred adjuvant treatment in advanced ovarian cancer.

Good overall response rate using platinum and taxane based chemotherapy in suboptimally cytoreduced patients[26] sparked an interest in neoadjuvant chemotherapy in advanced ovarian cancers. Initial reports of NACT in advanced ovarian cancers have reported a response rate of 70-80%[13],[15],[16] and an acceptable toxicity profile.[27],[28]

In our study, all patients could complete planned NACT with acceptable toxicity profile. Eighty-one percent of patients showed an objective response to NACT, with 20% patients having complete clinical and radiological response and 61% patients showing partial response.

Primary surgical cytoreduction in advanced ovarian cancer leads to an optimal cytoreduction in only 40 to 50% of patients.[11],[12] Since the amount of residual disease is the most important prognostic factor, every effort should be made to increase the optimal cytoreduction rate. NACT followed by surgical cytoreduction is one such approach. Many authors have reported an optimal cytoreduction rate of 60-75% following NACT in nonrandomized trials.[13],[14],[15],[16] In our study, optimal cytoreduction rate was 72%, which is similar to that reported in the literature using NACT. The surgical cytoreduction was 100% in patients with clinical and radiological complete response, 84% in patients with partial response and 0% in patients with no response to NACT. Hence response to NACT may also predict the degree of surgical cytoreduction likely to be achieved. In addition, NACT may provide an in vivo assessment of the chemo-sensitivity of the tumor.

Primary surgery in advanced ovarian cancers is associated with significant morbidity and prolonged hospital stay due to presence of large volume ascites, high tumor burden and involvement of adjacent pelvic organs.[28] NACT followed by surgical cytoreduction has many theoretical advantages in this kind of disease spectrum, including a dry operative field (due to resolution/decrease in ascites), decreased tumor burden, better operative planes with adjacent viscera leading to less extensive resections and high optimal cytoreduction rates. All these factors can contribute to a decreased postoperative morbidity and hospital stay and improve the patients' ability to tolerate postoperative adjuvant chemotherapy. Maurice et al have shown the rates of bowel resection, large peritoneal resection and postoperative morbidity were significantly reduced in the NACT group as compared to primary surgery.[29] In our study, postoperative complications occurred in four patients (4.9%) - in the form of wound infections in three and pancreatic fistula in one patient. The mean duration of hospital stay in our study was 4 days. In the current study, 72% of patients achieved optimal surgical cytoreduction following NACT in comparison to the 40 to 50% optimal surgical cytoreduction rates reported in literature[11],[12] in patients without NACT.

Extended resections, including that of rectum, small bowel, colon or urinary bladder, may sometimes require maximal cytoreduction in advanced ovarian cancer. However, the utility of extended resections has been questioned by many authors.[30],[31] In our series of 82 patients with advanced ovarian cancers, only 6 patients required segmental bowel resections (3 - large bowel; 3 - small bowel) for optimal cytoreduction. We undertook bowel resections only if it were to lead to optimal cytoreduction.

Survival in advanced ovarian cancers treated with primary cytoreduction followed by adjuvant chemotherapy ranges from 5 to 25%.[2],[5],[6],[7] Studies using NACT may lead to an improvement in overall and progression-free survival, as indicated in early reports from EORTC trial.[32] Overall 5-year survival in the current study was 32% with a median disease-free interval of 25.4 months, which is comparable to the survival figures quoted by other investigators using NACT.[13],[15],[16],[32],[33]

As far as the factors affecting survival in advanced ovarian cancer, many studies have consistently shown amount of residual disease to be a significant prognostic factor.[9],[10] Multivariate analysis of factors affecting survival in the current study has shown that the degree of cytoreduction was the only factor affecting overall survival. Survival was significantly better in patients who had optimal cytoreduction compared to those who could not be optimally cytoreduced ( P < 0.05). Presence of malignant pleural effusion has been cited as a bad prognostic factor in many studies.[34],[35] The patient population in this study included nearly 25% patients with metastatic disease in the form of cytologically proven pleural effusion. Response to NACT, surgical cytoreduction and overall survival were no different in this group compared to those with stage IIIC disease, contrary to the reports published[34],[35] showing an inferior survival in patients with pleural effusion. However, larger studies are needed to further elucidate this aspect of ovarian cancer.


 » Conclusion Top


The results of the current study show that NACT is a feasible and promising approach in advanced ovarian cancer. A significant number of patients respond to NACT leading to a higher optimal surgical cytoreduction, which may result in improved survival. Till the long-term results of the randomized trials (EORTC 55971 and MRC-CHORUS study) are available, surgery followed by chemotherapy will remain as the standard of care for managing advanced ovarian cancers.

 
 » References Top

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[Figure - 1], [Figure - 2]

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