Dose-dense therapy with weekly 1-hour paclitaxel infusions in the treatment of metastatic breast cancer.

1998 ◽  
Vol 16 (10) ◽  
pp. 3353-3361 ◽  
Author(s):  
A D Seidman ◽  
C A Hudis ◽  
J Albanell ◽  
J Albanel ◽  
W Tong ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Metastatic Breast ◽  
Weekly Paclitaxel ◽  
Pharmacokinetic Studies ◽  
Median Response ◽  
Prior Therapy ◽  
Anthracycline Therapy ◽  
Grade 3

PURPOSE To evaluate the efficacy and toxicity of paclitaxel administered as a 1-hour infusion on weekly basis, without interruption, to patients with metastatic breast cancer who had received prior therapy. PATIENTS AND METHODS Thirty patients with metastatic breast cancer received sustained weekly paclitaxel therapy at an initial dose of 100 mg/m2 until disease progression. Prior therapy included adjuvant only (n=17), metastatic only (n=7), or both (n=6). Eighteen patients had received prior anthracycline therapy, 12 of whom had demonstrated progression of disease within 12 months of it. All patients were assessable for efficacy; 29 patients were assessable for toxicity. Pharmacokinetic studies of paclitaxel were also performed. RESULTS A total of 469 weekly paclitaxel infusions were administered to 30 patients (median, 14 infusions/patient). The median delivered dose-intensity was 91 mg/m2/wk (range, 80 to 108). The overall response rate was 53% (95% confidence interval [CI], 34% to 72%), with 10% complete responses (CRs) and 43% partial responses (PRs). Median response duration was 7.5 months (range, 2 to 11+). Responses were observed in nine of 18 (50%) patients with prior anthracycline therapy, including six of 12 (50%) with disease progression on anthracycline within 1 year (three of four within 6 months). Therapy was well tolerated and remarkable for a lack of overall and cumulative myelosuppression. Grade 3/4 neutropenia occurred in four patients; febrile neutropenia was not observed. Peripheral neuropathy prohibited dose escalation above 100 mg/m2, and grade 3 neuropathy was observed in two of 21 patients at < or = 100 mg/m2. CONCLUSION Weekly paclitaxel therapy is active and well tolerated in patients with metastatic breast cancer. Weekly therapy should be considered as a current clinical option for these patients and should be incorporated into future comparative clinical trials.

Combination of paclitaxel and two schedules of gefitinib in patients with metastatic breast cancer

2006 ◽  
Vol 24 (18_suppl) ◽  
pp. 10599-10599 ◽  
Author(s):  
S. Cresta ◽  
A. Perotti ◽  
L. Merlini ◽  
M. Mansutti ◽  
A. Marchianã ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Antitumor Activity ◽  
Metastatic Breast ◽  
Sensory Neuropathy ◽  
Response Duration ◽  
Skin Toxicity ◽  
Median Response ◽  
Grade 3

10599 Background: The epidermal growth factor receptor (EGFR) may be overexpressed in breast cancer. Inhibition of EGFR signaling by gefitinib (Iressa) enhances the in vitro antitumor activity of many cytotoxic drugs including paclitaxel. Methods: In this phase II study patients (pts) with measurable metastatic breast cancer and maximum prior exposure to two chemotherapies were randomized to paclitaxel (100 mg/m2 on days 1, 8 q21) and continuous gefitinib, 250 mg daily for 21 days (arm A); or paclitaxel (100 mg/m2 on days 8, 15 q21) with gefitinib 250 mg daily from day 1 to 15 (arm B). Therapy continued for at least 4 cycles after best response. After 6 cycles, responding pts continued with gefitinib monotherapy until progression or unacceptable toxicity. Results: 16 pts in arm A and 17 in arm B were enrolled; 25 had visceral disease (12 in arm A and 13 in arm B). Median age was 53 years (range 29–70). All but one pt received prior anthracyclines and 9 also prior taxanes. Overall 17 pts responded to therapy (intent to treat analysis; arm A: 62.5%, 95% CI: 35.4–84.8%; arm B: 41.2%, 95% CI: 18.4–67.1%). Disease control (CR+PR+SD) was achieved in 81.3% of pts in arm A and 76.5% in arm B, with 10 and 6 pts who continued with gefitinib monotherapy after completing the combination schedule. Median time to progression was 250 (arm A) and 204 days (arm B), while median response duration was 212 (arm A) and 285 days (arm B). Tolerability was good with either schedule of gefitinib. Diarrhea was frequent (68.8% and 64.7%) and of grade 3–4 severity in 6% of pts in arm A and in arm B. Grade 3–4 neutropenia affected 6% and 12% of pts respectively, and 6% of pts in both arms had a grade 3–4 increase of AST and ALT. Other grade 1–2 adverse events included acneiform rash (100% in arm A and 58.8% in arm B), sensory neuropathy (68.8% and 58.8%), anemia (50.0% and 52.9%), neutropenia (25.0% and 17.6%) and myalgia (37.5% and 41.2%). Conclusions: The combination of paclitaxel with gefitinib given continuously or for 2 out of every 3 weeks is feasible and well tolerated. The discontinuous schedule caused less skin toxicity. The good antitumor activity deserves further studies to identify sensitive subgroups and mechanisms of sensitivity. IRESSA is a trademark of the AstraZeneca group of companies. [Table: see text]

The clinical utility of strict laboratory monitoring of CDK 4/6 inhibitors in metastatic breast cancer patients.

2019 ◽  
Vol 37 (15_suppl) ◽  
pp. 1062-1062
Author(s):  
Urvi Patel ◽  
Jane Lowe Meisel ◽  
Meagan Spencer Barbee ◽  
Kristina Frinzi ◽  
Elizabeth Sakach ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Quality Of Life ◽  
Metastatic Breast Cancer ◽  
Financial Burden ◽  
Metastatic Breast ◽  
Retrospective Chart Review ◽  
Breast Cancer Patients ◽  
Prior Therapy ◽  
Grade 3

1062 Background: Cyclin-dependent kinase 4/6 inhibitors (CDK 4/6i) are widely used in the treatment of hormone receptor positive, metastatic breast cancer (MBC). CDK 4/6is are well-tolerated and highly effective, but can cause neutropenia. Therefore, the FDA mandates assessment of the absolute neutrophil count (ANC) every 2 weeks for the first 2 cycles of therapy and monthly thereafter. Strict ANC monitoring is optimal in theory, but presents a challenge in the real world, impacting quality of life for patients (pts) and adding financial burden to the healthcare system. This study aims to evaluate whether strict monitoring of ANC significantly impacts treatment decisions, pt safety, and disease outcomes. Methods: A retrospective chart review of 160 pts with MBC was conducted at the Winship Cancer Institute in pts prescribed CDK 4/6is from Feb 2015 to Jan 2019. The pt’s ANC at C1D1, C1D14, C2D1, C2D14 were recorded along with various pt outcomes. Pts were divided into strict monitoring (SM) or relaxed monitoring (RM) groups. SM is defined as pts who received ANC testing within 72h of C1D14, C2D1, and C2D14. RM was defined as not meeting those criteria. Results: Palbociclib was used in 152 pts; abemaciclib was used in 8. Average age was 58. Study population was 55% Caucasian; 38% African American; 6% Asian. Pts had an average of 3 lines of prior therapy and average of 9 cycles on a CDK 4/6i. 71% of pts suffered neutropenia (40% grade 3, 4% grade 4, 2.5% febrile neutropenia). PFS and OS did not statistically differ between groups (Table), but OS data is immature. Conclusions: This study analyzed a more diverse and heavily pre-treated MBC population than previous CDK 4/6 studies. The prevalence of neutropenia (grade 3/4) aligns with results described in the PALOMA trial. PFS was higher in the RM group than in the SM group, suggesting strict monitoring for neutropenia does not improve PFS. If ANC monitoring parameters could be safely relaxed for CDK 4/6i, it could improve quality of life and decrease financial toxicity across the system. This is a topic worthy of further study. [Table: see text]

Weekly docetaxel in patients with metastatic breast cancer: A Bangladeshi perspective.

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. e11533-e11533
Author(s):  
Ehteshamul Hoque ◽  
Shanaz Karim ◽  
Rakib Uddin Ahmed
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Metastatic Breast ◽  
Progression Free Survival ◽  
Complete Response ◽  
Weekly Docetaxel ◽  
Previous Regimen ◽  
High Antitumor Activity ◽  
Grade 3

e11533 Background: Docetaxel has demonstrated high antitumor activity in first and second line treatment of metastatic breast cancer. Usually it is administrated three weekly at a dose of 75mg/ m2. We evaluated the efficacy and toxicity of Docetaxel in metastatic breast cancer in weekly bases. This study analyzed the efficacy and toxicity of docetaxel given weekly. Methods: Thirty eight patients with metastatic breast cancer received docetaxel, 35 mg/m2 weekly for six weeks, followed by two weeks interval. Additional cycles (three weeks' treatment, two weeks' rest) were given until disease progression or death. All patients had received prior chemotherapy. Of them 32 patients previously received anthracycline-containing regimens and 5 patients had received taxane based regimens. Results: Out of thirty eight patients thirty seven were evaluable. There was one complete response (3%), 11 patient has partial responses (30%), 17 patients with stable disease (46%) and six with disease progression (16%). Overall response rate was 78%. Median progression-free survival was 9.2 months. Three patients showed grade 3 neutropenia. 14 showed grade 3 alopecia, and various grade 1–2 non-haematological toxicities were observed. Treatment was delayed in two patients due to haemalotoxicity and stopped in one patient due to painful nail toxicity. Conclusions: Docetaxel is effective in three weekly regimens. In our study we found weekly docetaxel is as effective as the previous regimen. The efficacy of weekly docetaxel (35 mg/m2) can be an effective schedule for metastatic breast cancer who has received chemotherapy previously. The toxicity in this regimen is very low and manageable.

Phase II study of receptor-enhanced chemosensitivity using recombinant humanized anti-p185HER2/neu monoclonal antibody plus cisplatin in patients with HER2/neu-overexpressing metastatic breast cancer refractory to chemotherapy treatment.

1998 ◽  
Vol 16 (8) ◽  
pp. 2659-2671 ◽  
Author(s):  
M D Pegram ◽  
A Lipton ◽  
D F Hayes ◽  
B L Weber ◽  
J M Baselga ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Monoclonal Antibody ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Phase Ii ◽  
Metastatic Breast ◽  
Response Duration ◽  
Pharmacokinetic Parameters ◽  
Minor Response ◽  
Median Response

PURPOSE To determine the toxicity, pharmacokinetics, response rate, and response duration of intravenous (i.v.) administration of recombinant, humanized anti-p185HER2 monoclonal antibody (rhuMAb HER2) plus cisplatin (CDDP) in a phase II, open-label, multicenter clinical trial for patients with HER2/neu-overexpressing metastatic breast cancer. PATIENTS AND METHODS The study population consisted of extensively pretreated advanced breast cancer patients with HER2/neu overexpression and disease progression during standard chemotherapy. Patients received a loading dose of rhuMAb HER2 (250 mg i.v.) on day 0, followed by weekly doses of 100 mg i.v. for 9 weeks. Patients received CDDP (75 mg/m2) on days 1, 29, and 57. RESULTS Of 37 patients assessable for response, nine (24.3%) achieved a PR, nine (24.3%) had a minor response or stable disease, and disease progression occurred in 19 (51.3%). The median response duration was 5.3 months (range, 1.6-18). Grade III or IV toxicity was observed in 22 of 39 patients (56%). The toxicity profile reflected that expected from CDDP alone with the most common toxicities being cytopenias (n = 10), nausea/vomiting (n = 9), and asthenia (n = 5). Mean pharmacokinetic parameters of rhuMAb HER2 were unaltered by coadministration of CDDP. CONCLUSION The use of rhuMAb HER2 in combination with CDDP in patients with HER2/neu-overexpressing metastatic breast cancer results in objective clinical response rates higher than those reported previously for CDDP alone, or rhuMAb HER2 alone. In addition, the combination results in no apparent increase in toxicity. Finally, the pharmacology of rhuMAb HER2 was unaffected by coadministration with CDDP.

A phase II study of docetaxel in patients with paclitaxel-resistant metastatic breast cancer.

1998 ◽  
Vol 16 (10) ◽  
pp. 3362-3368 ◽  
Author(s):  
V Valero ◽  
S E Jones ◽  
D D Von Hoff ◽  
D J Booser ◽  
R G Mennel ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Metastatic Breast ◽  
Response Duration ◽  
Response Rates ◽  
Cross Resistance ◽  
Median Response ◽  
Best Response ◽  
Clinically Significant

PURPOSE To evaluate the efficacy and safety of docetaxel in patients with paclitaxel-resistant metastatic breast cancer (MBC). PATIENTS AND METHODS Docetaxel (100 mg/m2) was administered every 3 weeks to 46 patients registered at four centers. Patients had previously received < or = two chemotherapy regimens for MBC. All patients had progressive disease while receiving paclitaxel therapy. Treatment was repeated until there was evidence of disease progression or for a maximum of three cycles after best response. RESULTS Objective responses were seen in eight of 44 assessable patients (18.1%; 95% confidence interval [CI], 6.7% to 29.5%). Seven patients had partial responses and one patient responded completely. Response rates were not significantly different by previously received paclitaxel dose or resistance. No responses were seen in 12 patients who had previously received paclitaxel by 24-hour infusion, but the response rate in 32 patients who had received paclitaxel by 1- to 3-hour infusion was 25%. The median response duration was 29 weeks and the median time to disease progression was 10 weeks. Median survival was 10.5 months. Clinically significant (severe) adverse events included neutropenic fever (24% of patients), asthenia (22%), infection (13%), stomatitis (9%), neurosensory changes (7%), myalgia (7%), and diarrhea (7%). CONCLUSION Docetaxel is active in patients with paclitaxel-resistant breast cancer, particularly in those who failed to respond to brief infusions of paclitaxel. Response rates were comparable to or better than those seen with other therapies for patients with paclitaxel-resistant MBC. This confirms preclinical studies, which indicated only partial cross-resistance between paclitaxel and docetaxel.

Multicenter Phase II Trial of Weekly Paclitaxel in Women With Metastatic Breast Cancer

2001 ◽  
Vol 19 (22) ◽  
pp. 4216-4223 ◽  
Author(s):  
Edith A. Perez ◽  
Charles L. Vogel ◽  
David H. Irwin ◽  
Jeffrey J. Kirshner ◽  
Ravi Patel
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Phase Ii ◽  
Response Rate ◽  
Metastatic Breast ◽  
Weekly Paclitaxel ◽  
High Dose ◽  
Hematologic Toxicity ◽  
Prior Chemotherapy ◽  
Grade 3

PURPOSE: We evaluated the safety and efficacy of weekly paclitaxel therapy in women with metastatic breast cancer in a phase II multicenter trial. Entry criteria were relatively liberal to reflect the heterogeneity of metastatic breast cancer in clinical practice. PATIENTS AND METHODS: Patients had histologically confirmed and measurable metastatic breast cancer. Up to two prior chemotherapy regimens for metastatic disease, including prior therapy with anthracyclines and taxanes and prior high-dose therapy, were allowed. Paclitaxel 80 mg/m2 was administered weekly for 4 weeks per 4-week cycle. RESULTS: We enrolled 212 patients; 211 were assessable for toxicity and 177 were assessable for response. Ninety percent of patients had received prior chemotherapy (adjuvant, metastatic, or both), 46% of patients had three or more involved metastatic sites, and 60% of patients had visceral-dominant disease. Responses were documented on two occasions and were independently reviewed. The overall response rate (complete plus partial response) was 21.5% (95% confidence interval, 15.4% to 27.5%), with 41.8% of patients having disease stabilization. Median time to progression was 4.7 months, and overall survival in all 212 patients enrolled was 12.8 months. Therapy was well tolerated, with a 15% incidence of grade 3/4 hematologic toxicity and a 9% incidence of grade 3 neurotoxicity; other serious toxicities were rare. The response rate and toxicity profile in the 34% of patients ≥ 65 years of age were similar to that of younger patients. CONCLUSION: Weekly paclitaxel therapy was well tolerated and demonstrated reasonable activity in this relatively heavily pretreated population with advanced disease. Further study of weekly paclitaxel in combination therapy is warranted.

Weekly Paclitaxel in Metastatic Breast Cancer Patients: A Phase II Study

2002 ◽  
Vol 88 (6) ◽  
pp. 470-473 ◽  
Author(s):  
Stefania Gori ◽  
Anna Maria Mosconi ◽  
Carlo Basurto ◽  
Roberta Cherubini ◽  
Verena De Angelis ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Cancer Patients ◽  
Phase Ii ◽  
Stable Disease ◽  
Phase Ii Study ◽  
Metastatic Breast ◽  
Breast Cancer Patients ◽  
Grade 3

Aims and background Paclitaxel, a microtubule inhibitor, is one of the most active drugs in metastatic breast cancer. A weekly schedule, at a median dose-intensity of 91 mg/m2, is effective and has less side effects than a 3-week schedule. In this phase II study, we evaluated the toxicity and the activity of weekly 1 hr paclitaxel infusions in metastatic breast cancer patients. Study design Between February 1999 and February 2001, 26 patients with metastatic breast cancer were treated with weekly paclitaxel (60–90 mg/m2/1 hour iv infusion/weekly). The treatment was planned to continue until disease progression or prohibitive toxicity; in patients with responsive or stable disease, paclitaxel was stopped after 6 months of therapy. Results At a median follow-up of 18.7 months (range, 6.8–30.8), all patients are assessable for response and toxicity. We obtained 8 partial responses (30.8%), 8 stable disease (30.8%) and 10 disease progression (38.4.%). The overall response was 30.8% (95% CI, 13.1–48.5). The median duration of response was 7.6 months (range, 1.8–12.4); median time to progression was 4.86 months (range, 1.4–12.4); median overall survival was 9.9 months (range, 1.7–29.2+). Treatment was well tolerated. Hematological toxicity was mild and only one patient developed grade 3 anemia. Two patients experienced grade 3 cardiovascular toxicity; both had received anthracycline-based regimens. Conclusions In our experience, weekly administration of paclitaxel shows a substantial degree of activity even in pretreated metastatic breast cancer patients. The toxicity profile is favorable.

Interim safety analysis of the randomized phase III PELICAN trial evaluating pegylated liposomal doxorubicin (PLD) versus capecitabine as first-line therapy for metastatic breast cancer

2009 ◽  
Vol 27 (15_suppl) ◽  
pp. 1118-1118
Author(s):  
S. Al-Batran ◽  
S. Saupe ◽  
M. Schmidt ◽  
R. Kreienberg ◽  
B. Otremba ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Performance Status ◽  
Single Agent ◽  
Metastatic Breast ◽  
Pegylated Liposomal Doxorubicin ◽  
Phase Iii ◽  
First Line ◽  
Grade 3

1118 Background: Treatment of metastatic breast cancer (MBC) focuses on relieving symptoms and extending life. Single-agent therapy is preferred in the first-line setting to reduce the risk of toxicity and maintain quality of life. The PELICAN trial was designed to evaluate efficacy and safety of first-line PLD vs capecitabine at standard approved dosages. Methods: PELICAN is an open-label, multinational, randomized, multicenter trial. MBC Patients (pts) were randomized to receive PLD (50 mg/m2 every 28 days) or capecitabine (1250 mg/m2 BID x 14 days every 21 days) until disease progression or unacceptable toxicity. The primary endpoint was to compare time to disease progression between treatment arms. Toxicity was evaluated continuously. Results: The study is still ongoing, but no longer recruiting. So far, 210 pts (PLD, 105; capecitabine, 105) were evaluated for safety, of whom 131 pts have already completed their treatment (83 for disease progression, 19 for toxicity, 5 died, 24 for other reasons). 90% of pts had ECOG performance status 1 or 2, and 79% were postmenopausal. Mean age was 61.5 years, and 34% received prior adjuvant anthracycline. Pts received a median of 4 cycles of PLD and a median of 5 cycles of capecitabine. Over 90% of pts in both groups experienced at least one adverse event (AE). Grade 3/4 AEs were reported in 99 patients (PLD, 44; capecitabine, 55). Hand foot syndrome (HFS) was the most common AE (grade 3: PLD 35%; capecitabine 19%), followed by diarrhea (grade 3/4: PLD, 0; capecitabine, 13%) and thromboembolic events (PLD, 0%; capecitabine, 9%). Other grade 3/4 AEs affected 1 week in 16%. Conclusions: Overall, first-line monotherapy with PLD or capecitabine at approved doses was maintainable for a median of about 4 months with manageable AEs. Interim safety results of the PELICAN trial show no unanticipated toxicity. Efficacy results will be available once all patients have completed their therapy. [Table: see text]

Phase I/II trial of biweekly paclitaxel and cisplatin in the treatment of metastatic breast cancer.

1996 ◽  
Vol 14 (4) ◽  
pp. 1185-1191 ◽  
Author(s):  
K A Gelmon ◽  
S E O'Reilly ◽  
A W Tolcher ◽  
C Campbell ◽  
C Bryce ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Phase I ◽  
Metastatic Breast ◽  
Maximum Tolerated Dose ◽  
Fixed Dose ◽  
Previous Exposure ◽  
Median Response ◽  
Grade 3 ◽  
Initial Starting

PURPOSE To determine the maximum-tolerated dose of escalating doses of paclitaxel (Taxol; Bristol-Myers Squibb, Princeton, NJ) administered biweekly with a fixed dose of cisplatin, to assess the toxicity, and to evaluate the activity of this combination in a phase I/II trial in metastatic breast cancer. PATIENTS AND METHODS Twenty-nine women with metastatic breast cancer were enrolled; 27 were assessable for response and 29 for toxicity. All but two of the women had received prior adjuvant chemotherapy, with 23 receiving anthracyclines and six previous cisplatin. RESULTS The initial starting dose of paclitxel 90 mg/m2 and cisplatin 60 mg/m2 became the phase II dose due to dose-limiting neutropenia. Responses were seen in 85% of assessable patients, with three patients (11%) achieving a complete response (CR) and 20 patients (14%) a partial response (PR), for an overall response rate of 85% (95% confidence interval [CI], 66% to 96%). The time to disease progression for patients who achieved a CR was 110 to 200 days, and for those with a PR, it was 96 to 377+ days, with a median time to progression of 7.1 months and a median response duration of 7.9 months. Sites of CR were skin, soft tissue, and lung, and all occurred in women with previous exposure to anthracyclines. Septic events were rare, with two grade 3 infections (7%), only one of which required hospital admission. There were no grade 4 nonhematologic toxicity and minimal grade 3 toxicity. A total of 251 chemotherapy cycles were given -- 16 with paclitaxel alone in five patients. Forty-five percent of patients required dose reductions, while 52% had delays due to neutropenia. CONCLUSION Biweekly paclitaxel and cisplatin is an active combination in the treatment of metastatic breast cancer, including for patients with previous exposure to anthracyclines.

Phase II Clinical Trial of Ixabepilone (BMS-247550), an Epothilone B Analog, in Patients With Taxane-Resistant Metastatic Breast Cancer

2007 ◽  
Vol 25 (23) ◽  
pp. 3399-3406 ◽  
Author(s):  
Eva Thomas ◽  
Josep Tabernero ◽  
Monica Fornier ◽  
Pierfranco Conté ◽  
Pierre Fumoleau ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Metastatic Breast Cancer ◽  
Disease Progression ◽  
Phase Ii ◽  
Response Rate ◽  
Metastatic Breast ◽  
Response Duration ◽  
Tumor Cell Death ◽  
Median Response ◽  
Epothilone B

Purpose Ixabepilone (BMS-247550) is an epothilone analog that optimizes the properties of naturally occurring epothilone B. Natural epothilones and their analogs promote tumor cell death by binding to tubulin and stabilizing microtubules, causing apoptosis. This international phase II trial assessed the activity of ixabepilone in patients with metastatic breast cancer (MBC) that was resistant to taxane therapy. Patients and Methods MBC patients, who had experienced disease progression while receiving or within 4 months of taxane therapy (6 months if adjuvant taxane only), and who had a taxane as their last regimen, received ixabepilone (1- or 3-hour infusion of 50 mg/m2 or 3-hour infusion of 40 mg/m2 every 3 weeks). Results Of 49 patients treated with 40 mg/m2 ixabepilone during 3 hours, 35 (73%) had experienced disease progression within 1 month of their last taxane dose. The response rate was 12% (95% CI, 4.7% to 26.5%). All responses (n = 6) were partial; five of six patients had not responded to prior taxane therapy. In responders, the median response duration was 10.4 months. In 20 patients (41%), stable disease was the best outcome. Median time to progression was 2.2 months (95% CI, 1.4 to 3.2 months); median survival was 7.9 months. For treated patients across all cohorts (intent-to-treat population), the response rate was also 12% (eight of 66). Treatment-related adverse events in the study were manageable and primarily grade 1/2. Treatment-related neuropathy was mostly sensory and mild to moderate. Conclusion Ixabepilone (40 mg/m2 as a 3-hour infusion every 3 weeks) demonstrates promising antitumor activity and an acceptable safety profile in patients with taxane-resistant MBC.

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