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© 2001 American Society for Clinical Oncology Paclitaxel and Carboplatin, Alone or With Irradiation, in Advanced or Recurrent Endometrial Cancer: A Phase II StudyByFrom the Gynecologic Tumor Group and Cancer Control Research, British Columbia Cancer Agency, Vancouver, British Columbia, Canada. Address reprint requests to Paul J. Hoskins, MD, British Columbia Cancer Agency, 600 W 10th Ave, Vancouver, BC, Canada V5Z 4E6; email: phoskins{at}bccancer.bc.ca
PURPOSE: To evaluate the efficacy of carboplatin plus paclitaxel in primarily advanced or recurrent endometrial cancers. PATIENTS AND METHODS: Four distinct patient groups received carboplatin (area under the curve, 5 to 7) plus paclitaxel 175 mg/m2 for 3 hours at 4-week intervals: group 1 (n = 21), patients with primarily advanced, nonpapillary serous cancers; group 2 (n = 20), the same as group 1 but with papillary serous cancers; group 3 (n = 18), recurrent, nonpapillary serous cancers; and group 4 (n = 4), recurrent, papillary serous cancers. Involved-field irradiation was used in groups 1 and 2 for those with radioencompassable disease. RESULTS: Sixty-three patients were treated. Response rates to chemotherapy in the assessable patients in the four groups were 78% (95% confidence interval [CI], 51% to 100%); 60% (95% CI, 35% to 85%), 56% (95% CI, 34% to 78%), and 50%, respectively. Nineteen patients (90%) in group 1 also were irradiated, and the median failure-free survival time for all 21 patients was 23 months, with a 62% 3-year overall survival rate. Eleven patients (55%) in group 2 were irradiated, and the median failure-free survival time for all 18 patients was 18 months, with a 39% 3-year overall survival rate. The median failure-free interval in the patients in group 3 was 6 months, with a 15-month median overall survival time. Toxicity was manageable, reversible, and predominantly hematologic. Two patients developed neutropenic fever, and three patients, including these two, were hospitalized for complications. CONCLUSION: Carboplatin-paclitaxel is an efficacious, low-toxicity regimen for managing primarily advanced or recurrent endometrial cancers.
CHEMOTHERAPY HAS a role in the management of endometrial cancer both in newly diagnosed patients with a high risk of relapse and in patients with recurrent disease. High-risk newly diagnosed patients include the 15% of patients who present with surgical stage IIIB or higher disease. The 5-year overall survival rate is 42% to 59% in the presence of stage IIIC disease and 18% to 30% for stage IV disease.1 A second high-risk group comprises those with stage III or IV cancers of papillary serous histology, of whom less than 25% will be long-term survivors.2-4 There is no consensus regarding the optimal chemotherapy, but the combination of cisplatin plus doxorubicin is commonly used. The results from Gynecologic Oncology Group Trial 107 support such an approach in that there was a significantly higher response rate (44% v 28%) and longer progression-free interval with cisplatin-doxorubicin compared with doxorubicin alone.5 Better chemotherapy is required because this response rate is too low, the regimen is unpleasantly toxic, the need for a saline diuresis precludes those with heart failure, and it is inconvenient for patients and consuming of nursing resources because of the hydration needed. Paclitaxel attracted attention for use in patients with endometrial cancer because of its success in ovarian and breast cancers. Three studies, all reported in 1996, demonstrated response rates of 36% to 43% when paclitaxel was used as a single agent.6-8 Importantly, activity was demonstrated in truly platin-resistant patients.6 The next logical step to develop a potentially more effective chemotherapy regimen was to combine paclitaxel with a platin analog. We did so, using carboplatin because of its lesser toxicity. The results of treating patients with primarily advanced or recurrent endometrial cancers with carboplatin and paclitaxel are the subject of this article.
Study Population Patients were eligible if they had histologically documented endometrial cancer fulfilling any of the following criteria: (1) newly diagnosed, primarily advanced, ie, surgical stages IIIB, IIIC, or IV; clinical stage IV; IIIA with macroscopic ovarian involvement; or any stage with residual disease; or (2) recurrent after surgery and/or radiotherapy. There was no upper age limit, performance status had to be an Eastern Cooperative Oncology Group score of 3 or better, serum creatinine had to be less then 180 µmol/L, platelets had to be greater than 100 x 109/L, and granulocytes had to be greater than 1.5 x 109/L. The exclusion criteria included the presence of any sarcoma or small-cell component, second- or third-degree heart block, preexisting motor or sensory neuropathy, prior chemotherapy, or recurrent disease limited to a previously irradiated volume. Formal biopsy proof of recurrence was not required.
Treatment Regimen
Dose Modification
Response Assessment/Survival
Toxicity
Sixty-three patients with a median age of 67 years (range, 35 to 85 years) were treated from the initiation of the study in August 1995 through November 1998. This later cutoff date was chosen to allow for a sufficiently long period of follow-up. Survival outcomes were updated as of August 2000. Four separate groups were treated: newly diagnosed, primarily advanced endometrial cancer, excluding papillary serous (group 1, n = 21); newly diagnosed, primarily advanced papillary serous (group 2, n = 20); recurrent endometrial cancer, excluding papillary serous (group 3, n = 18); and recurrent papillary serous (group 4, n = 4). Further details are given in Table 1. At diagnosis, the 18 patients in group 3 who had experienced relapse had undergone total abdominal hysterectomy and bilateral salpingo-oophorectomy (n = 15), the same plus omentectomy (n = 1), or dilation and curettage (n = 2). Their stages were I (n = 5), II (n = 6), III (n = 5), IV (n = 1), and unknown (n = 1). Sixteen then went on to receive pelvic irradiation (external beam plus brachytherapy), one had a vault cesium, and one received megestrol acetate. Only one other patient received hormones, and that was at the time of first relapse. Carboplatin and paclitaxel were administered at first relapse in 15 patients and at second relapse in three. The median time from diagnosis to the administration of chemotherapy was 31 months (range, 3 to 145 months). All the patients in groups 1 and 2, with the exception of six patients with widespread disseminated disease, underwent at least total abdominal hysterectomy, bilateral salpingo-oophorectomy, and abdominal exploration. During this period, nine patients who could have been treated on this protocol were treated in a different fashion. The reasons for this were physician choice (n = 7) and patient choice (n = 2). Nineteen (90%) of the patients in group 1 were treated with chemotherapy followed by irradiation, and two were treated with chemotherapy alone. In group 2, 11 (55%) received chemotherapy and irradiation, and nine received chemotherapy alone. The chemotherapy always preceded the irradiation. All the patients with recurrent disease received chemotherapy alone.
Response Rates The overall response rate was 78% (95% confidence interval [CI], 51% to 100%) in primarily advanced, nonpapillary serous endometrial cancers (group 1, n = 9); 60% (95% CI, 35% to 85%) in primarily advanced papillary serous cancers (group 2, n = 15); 56% (95% CI, 34% to 78%) in recurrent nonpapillary serous cancer (group 3, n = 18), and 50% in recurrent papillary serous (group 4, n = 4) (Table 2). The great majority of responses (75%) were partial. Response assessment was radiologic in 33 patients and clinical in 13. Only patients with measurable disease were included in the response assessment.
Survival The median failure-free survival time for the newly diagnosed, primarily advanced patients was 23 months for those with nonpapillary serous cancers (group 1) and 18 months for those with papillary serous cancers (group 2) (Figs 1 to 3). The median overall survival time has not yet been reached in group 1 and was 26 months in group 2. Three-year overall survival rates for groups 1 and 2 were 62% and 39%, respectively. There was no evidence for a plateau in either case. The median failure-free survival time for those with recurrent, nonpapillary serous cancer was 6 months, with a median overall survival time of 15 months. All responding patients who experienced relapse previously have done so again.
Toxicity There was no evidence for any cumulative hematologic toxicity secondary to the chemotherapy except for hemoglobin (assessed by comparing those receiving either three or six cycles). Median neutrophil nadirs after either three or six cycles were 0.9 x 109/L and 0.8 x 109/L, respectively; platelet nadirs were 143 x 109/L and 138 x 109/L, respectively; and hemoglobin nadirs were 110 g/L and 93 g/L, respectively. Two patients (3%) developed febrile neutropenia, but no patients required granulocyte colony-stimulating factor. One patient had a platelet transfusion, and two had blood transfusions. Three patients (4%) were hospitalized because of complications. There were no treatment-related deaths.
Treatment Delivery
The intent of this phase II protocol was to assess the efficacy and toxicity of the combination of carboplatin and paclitaxel in women with primarily advanced or recurrent endometrial cancers. The toxicity was easily manageable and predominantly hematologic. Of the 63 patients, only 4% were hospitalized because of complications. The two patients (3%) experiencing febrile neutropenia were part of this group. All patients lost their hair. Our impression was that this regimen was tolerated much better then our previously used regimen of doxorubicin and cisplatin. This is not surprising given the switch to carboplatin from cisplatin that has occurred in the treatment of ovarian cancer because of its improved therapeutic index.11 An additional advantage is convenience, in that this regimen is an outpatient treatment without the need for extensive hydration. Four distinct groups of patients were treated. Group 1 consisted of women with newly diagnosed, primarily advanced cancer (defined as surgical stage IIIB or greater, IIIA with macroscopic ovarian involvement, or stage II with residual disease), excluding those with papillary serous histology. Nine of the 21 patients in this group had measurable disease, and the response rate was 78% (95% CI, 51% to 100%). Nineteen of this group then went on to receive involved-field irradiation. The median failure-free survival time was 23 months, and the median overall survival time has not yet been reached, with 62% alive at 3 years. Group 3 consisted of 18 patients with recurrent endometrial cancer, again excluding those with any papillary serous component. Chemotherapy alone was used, with an overall response rate of 56% (95% CI, 34% to 78%). Nine of the 10 responses were partial. The median failure-free survival time was 6 months, and the overall survival time was 15 months. All patients eventually died from their disease. There are four other series reporting on the activity of either carboplatin or cisplatin and paclitaxel in similar patients. In two of the studies, patients with both primarily advanced and recurrent disease were treated, with no differentiation between these distinct biologic entities. The response rates were similar to ours, 63% and 72%.12,13 Trudeau et al14 reported a 75% response rate in eight patients with recurrent disease. In the final study, there was a 67% response rate in 24 patients with newly diagnosed, primarily advanced cancers, including a few with papillary serous histology.15 Our remaining two groups consisted of women who had at least some component of papillary serous carcinoma. Group 2 consisted of patients with primarily advanced disease, and the patients in group 4 had recurrent disease. They were analyzed separately from the other histologic types because of the different behavior pattern of papillary serous carcinoma. It is more aggressive and has a pattern of spread similar to epithelial ovarian cancer. Patients with stage III or IV disease have reported 5-year survival rates of 0% to 25%, which is much lower than those of other histologic types.2-4,16 The response rate in the 15 assessable, primarily advanced patients in group 2 was 60% (95% CI, 35% to 85%). The majority of these responses were partial. Eleven of these newly diagnosed patients were then irradiated as part of their primary therapy. Despite this aggressive approach, there was no evidence for a plateau to the survival curves, with a median failure-free survival time of 18 months and a median overall survival time of 28 months. The response rate in the four patients with recurrent disease was 50% (group 4). There are two other reports of carboplatin and paclitaxel in this particular histologic sub type. In 11 patients with recurrent papillary serous cancers, the response rate was 64%. Thirteen other patients received the combination as adjuvant therapy for newly diagnosed stage III or IV disease, with a median survival time of 40 months.17 In the second study, 16 patients with either recurrent or advanced disease were treated, and there was an 82% response rate.18 Are these results any different from those achieved with cisplatin and doxorubicin? In the absence of a randomized comparison, one can only compare this regimen with other series, with all the pitfalls inherent in such an approach. Additionally, we included involved-field irradiation in the majority of our primarily advanced patients. For the papillary serous cancers, the comparison is with cisplatin, doxorubicin, and cyclophosphamide (Table 3). The response rates were higher with carboplatin and paclitaxel (50% to 82% v 18% to 27%). The median survivals were similar but favored carboplatin and paclitaxel.17-21 When comparing outcomes in patients with nonpapillary serous histologies (Table 4), the response rates with platinum and paclitaxel were superior to those with cisplatin and doxorubicin (67% v 52%).5,22-28
On the basis of the low toxicity, ease of delivery, and at least equivalent efficacy, carboplatin and paclitaxel, plus or minus irradiation, has become our standard therapy. The results are sufficiently interesting to justify formal phase III comparison with platinum and doxorubicin. Phase III testing is needed because neither of these combinations is ideal; patient relapse is the norm. However, such chemotherapy can be used as the back bone on which additional therapies, such as newer chemotherapy agents or treatments targeting specific signaling pathways, can be added. It is therefore important to know which of these is the best back bone for such future studies, with best being defined as either superior efficacy or lesser toxicity with equivalent efficacy.
Presented in part at the Thirty-Seventh Annual Meeting of the American Society of Clinical Oncology, San Francisco, CA, May 12-15, 2001.
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Copyright © 2001 by the American Society of Clinical Oncology, Online ISSN: 1527-7755. Print ISSN: 0732-183X
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