Mechanism of Action
Docetaxel is an antineoplastic agent that acts by disrupting the microtubular network in cells that is essential for mitotic and interphase cellular functions. Docetaxel binds to free tubulin and promotes the assembly of tubulin into stable microtubules while simultaneously inhibiting their disassembly. This leads to the production of microtubule bundles without normal function and to the stabilization of microtubules, which results in the inhibition of mitosis in cells. Docetaxel's binding to microtubules does not alter the number of protofilaments in the bound microtubules, a feature which differs from most spindle poisons currently in clinical use.
Human Pharmacokinetics
The pharmacokinetics of docetaxel have been evaluated in cancer patients after
administration of 20-115 mg/m2 in phase I studies. The area under
the curve (AUC) was dose proportional following doses of 70-115 mg/m2
with infusion times of 1 to 2 hours. Docetaxel's pharmacokinetic profile is
consistent with a three-compartment pharmacokinetic model, with half-lives for
the α, β, and γ phases of 4 min, 36 min, and 11.1 hr, respectively.
The initial rapid decline represents distribution to the peripheral compartments
and the late (terminal) phase is due, in part, to a relatively slow efflux of
docetaxel from the peripheral compartment. Mean values for total body clearance
and steady state volume of distribution were 21 L/h/m2 and 113 L,
respectively. Mean total body clearance for Japanese patients dosed at the range
of 10-90 mg/m2 was similar to that of European/American populations
dosed at 100 mg/m2, suggesting no significant difference in the elimination
of docetaxel in the two populations.
A study of 14C-docetaxel was conducted in three cancer patients.
Docetaxel was eliminated in both the urine and feces following oxidative metabolism
of the tert-butyl ester group, but fecal excretion was the main elimination
route. Within 7 days, urinary and fecal excretion accounted for approximately
6% and 75% of the administered radioactivity, respectively. About 80% of the
radioactivity recovered in feces is excreted during the first 48 hours as 1
major and 3 minor metabolites with very small amounts (less than 8%) of unchanged
drug.
A population pharmacokinetic analysis was carried out after TAXOTERE treatment
of 535 patients dosed at 100 mg/m2. Pharmacokinetic parameters estimated
by this analysis were very close to those estimated from phase I studies. The
pharmacokinetics of docetaxel were not influenced by age or gender and docetaxel
total body clearance was not modified by pretreatment with dexamethasone. In
patients with clinical chemistry data suggestive of mild to moderate liver function
impairment (SGOT and/or SGPT > 1.5 times the upper limit of normal [ULN] concomitant
with alkaline phosphatase > 2.5 times ULN), total body clearance was lowered
by an average of 27%, resulting in a 38% increase in systemic exposure (AUC).
This average, however, includes a substantial range and there is, at present,
no measurement that would allow recommendation for dose adjustment in such patients.
Patients with combined abnormalities of transaminase and alkaline phosphatase
should, in general, not be treated with TAXOTERE.
Clearance of docetaxel in combination therapy with cisplatin was similar to
that previously observed following monotherapy with docetaxel. The pharmacokinetic
profile of cisplatin in combination therapy with docetaxel was similar to that
observed with cisplatin alone. The combined administration of docetaxel, cisplatin
and fluorouracil in 12 patients with solid tumors had no influence on the pharmacokinetics
of each individual drug.
A population pharmacokinetic analysis of plasma data from 40 patients with
hormone-refractory metastatic prostate cancer indicated that docetaxel systemic
clearance in combination with prednisone is similar to that observed following
administration of docetaxel alone.
A study was conducted in 30 patients with advanced breast cancer to determine
the potential for drug-drug-interactions between docetaxel (75 mg/m2),
doxorubicin (50 mg/m2), and cyclophosphamide (500 mg/m2)
when administered in combination. The coadministration of docetaxel had no effect
on the pharmacokinetics of doxorubicin and cyclophosphamide when the three drugs
were given in combination compared to coadministration of doxorubicin and cyclophosphamide
only. In addition, doxorubicin and cyclophosphamide had no effect on docetaxel
plasma clearance when the three drugs were given in combination compared to
historical data for docetaxel monotherapy.
In vitro studies showed that docetaxel is about 94% protein bound, mainly
to α1-acid glycoprotein, albumin, and lipoproteins. In three
cancer patients, the in vitro binding to plasma proteins was found to
be approximately 97%. Dexamethasone does not affect the protein binding of docetaxel.
In vitro drug interaction studies revealed that docetaxel is metabolized
by the CYP3A4 isoenzyme, and its metabolism can be inhibited by CYP3A4 inhibitors,
such as ketoconazole, erythromycin, troleandomycin, and nifedipine. Based on
in vitro findings, it is likely that CYP3A4 inhibitors and/or substrates
may lead to substantial increases in docetaxel blood concentrations. No clinical
studies have been performed to evaluate this finding [see Drug
Interactions].
Clinical Studies
Breast Cancer
The efficacy and safety of TAXOTERE have been evaluated in locally advanced or metastatic breast cancer after failure of previous chemotherapy (alkylating agent-containing regimens or anthracycline-containing regimens).
Trials In one randomized trial, patients with a history of prior treatment
with an anthracycline-containing regimen were assigned to treatment with TAXOTERE
(100 mg/m2 every 3 weeks) or the combination of mitomycin (12 mg/m2
every 6 weeks) and vinblastine (6 mg/m2 every 3 weeks). 203 patients
were randomized to TAXOTERE and 189 to the comparator arm. Most patients had
received prior chemotherapy for metastatic disease; only 27 patients on the
TAXOTERE arm and 33 patients on the comparator arm entered the study following
relapse after adjuvant therapy. Three-quarters of patients had measurable, visceral
metastases. The primary endpoint was time to progression. The following table
summarizes the study results (See Table 13).
Table 13 - Efficacy of TAXOTERE in the Treatment of Breast
Cancer Patients Previously Treated with an Anthracycline-Containing Regimen
(Intent-to-Treat Analysis)
| Efficacy Parameter |
Docetaxel
(n=203) |
Mitomycin/
Vinblastine
(n=189) |
p-value |
| Median Survival |
11.4 months |
8.7 months |
|
| Risk Ratio*, Mortality (Docetaxel: Control) |
0.73 |
p=0.01 Log Rank |
| 95% CI (Risk Ratio) |
0.58-0.93 |
|
| Median Time to Progression |
4.3 months |
2.5 months |
| Risk Ratio*, Progression (Docetaxel: Control) |
0.75 |
p=0.01 Log Rank |
| 95% CI (Risk Ratio) |
0.61-0.94 |
|
| Overall Response Rate |
28.1% |
9.5% |
p < 0.0001 |
| Complete Response Rate |
3.4% |
1.6% |
Chi Square |
| *For the risk ratio, a value less than 1.00 favors docetaxel. |
In a second randomized trial, patients previously treated with an alkylating-containing
regimen were assigned to treatment with TAXOTERE (100 mg/m2) or doxorubicin
(75 mg/m2) every 3 weeks. 161 patients were randomized to TAXOTERE
and 165 patients to doxorubicin. Approximately one-half of patients had received
prior chemotherapy for metastatic disease, and one-half entered the study following
relapse after adjuvant therapy. Three-quarters of patients had measurable, visceral
metastases. The primary endpoint was time to progression. The study results
are summarized below (See Table 14).
Table 14 - Efficacy of TAXOTERE in the Treatment of Breast
Cancer Patients Previously Treated with an Alkylating-Containing Regimen (Intent-to-Treat
Analysis)
| Efficacy Parameter |
Docetaxel
(n=161) |
Doxorubicin
(n=165) |
p-value |
| Median Survival |
14.7 months |
14.3 months |
|
| Risk Ratio*, Mortality (Docetaxel: Control) |
0.89 |
p=0.39
Log Rank |
| 95% CI (Risk Ratio) |
0.68-1.16 |
|
| Median Time to Progression |
6.5 months |
5.3 months |
|
| Risk Ratio*, Progression (Docetaxel: Control) |
0.93 |
p=0.45
Log Rank |
| 95% CI (Risk Ratio) |
0.71-1.16 |
|
| Overall Response Rate |
45.3% |
29.7% |
p=0.004 |
| Complete Response Rate |
6.8% |
4.2% |
Chi Square |
| *For the risk ratio, a value less than 1.00 favors docetaxel. |
In another multicenter open-label, randomized trial (TAX313), in the treatment
of patients with advanced breast cancer who progressed or relapsed after one
prior chemotherapy regimen, 527 patients were randomized to receive TAXOTERE
monotherapy 60 mg/m2 (n=151), 75 mg/m2 (n=188) or 100
mg/m2 (n=188). In this trial, 94% of patients had metastatic disease
and 79% had received prior anthracycline therapy. Response rate was the primary
endpoint. Response rates increased with TAXOTERE dose: 19.9% for the 60 mg/m2
group compared to 22.3% for the 75 mg/m2 and 29.8% for the 100 mg/m2
group; pair-wise comparison between the 60 mg/m2 and 100 mg/m2
groups was statistically significant (p=0.037).
TAXOTERE at a dose of 100 mg/m2 was studied in six single arm studies
involving a total of 309 patients with metastatic breast cancer in whom previous
chemotherapy had failed. Among these, 190 patients had anthracycline-resistant
breast cancer, defined as progression during an anthracycline-containing chemotherapy
regimen for metastatic disease, or relapse during an anthracycline-containing
adjuvant regimen. In anthracycline-resistant patients, the overall response
rate was 37.9% (72/190; 95% C.I.: 31.0-44.8) and the complete response rate
was 2.1%.
TAXOTERE was also studied in three single arm Japanese studies at a dose of
60 mg/m2, in 174 patients who had received prior chemotherapy for
locally advanced or metastatic breast cancer. Among 26 patients whose best response
to an anthracycline had been progression, the response rate was 34.6% (95% C.I.:
17.2-55.7), similar to the response rate in single arm studies of 100 mg/m2.
Adjuvant Treatment of Breast Cancer
A multicenter, open-label, randomized trial (TAX316) evaluated the efficacy
and safety of TAXOTERE for the adjuvant treatment of patients with axillary-node-positive
breast cancer and no evidence of distant metastatic disease. After stratification
according to the number of positive lymph nodes (1-3, 4+), 1491 patients were
randomized to receive either TAXOTERE 75 mg/m2 administered 1-hour
after doxorubicin 50 mg/m2 and cyclophosphamide 500 mg/m2
(TAC arm), or doxorubicin 50 mg/m2 followed by fluorouracil 500 mg/m2
and cyclosphosphamide 500 mg/m2 (FAC arm). Both regimens were administered
every 3 weeks for 6 cycles. TAXOTERE was administered as a 1-hour infusion;
all other drugs were given as IV bolus on day 1. In both arms, after the last
cycle of chemotherapy, patients with positive estrogen and/or progesterone receptors
received tamoxifen 20 mg daily for up to 5 years. Adjuvant radiation therapy
was prescribed according to guidelines in place at participating institutions
and was given to 69% of patients who received TAC and 72% of patients who received
FAC.
Results from a second interim analysis (median follow-up 55 months) are as
follows: In study TAX316, the docetaxel-containing combination regimen TAC showed
significantly longer disease-free survival (DFS) than FAC (hazard ratio=0.74;
2-sided 95% CI=0.60, 0.92, stratified log rank p=0.0047). The primary endpoint,
disease-free survival, included local and distant recurrences, contralateral
breast cancer and deaths from any cause. The overall reduction in risk of relapse
was 25.7% for TAC-treated patients. (See Figure 1).
At the time of this interim analysis, based on 219 deaths, overall survival was longer for TAC than FAC (hazard ratio=0.69, 2-sided 95% CI=0.53, 0.90). (See Figure 2). There will be further analysis at the time survival data mature.
Figure 1 - TAX316 Disease Free Survival K-M curve
Figure 2 - TAX316 Overall Survival K-M Curve
The following table describes the results of subgroup analyses for DFS and OS (See Table 15).
Table 15 - Subset Analyses-Adjuvant Breast Cancer Study
| |
|
Disease Free Survival |
Overall Survival |
| Patient subset |
Number of
patients |
Hazard
ratio* |
95% CI |
Hazard
ratio* |
95% CI |
| No. of positive nodes |
| Overall |
744 |
0.74 |
(0.60, 0.92) |
0.69 |
(0.53, 0.90) |
| 1-3 |
467 |
0.64 |
(0.47, 0.87) |
0.45 |
(0.29, 0.70) |
| 4+ |
277 |
0.84 |
(0.63, 1.12) |
0.93 |
(0.66, 1.32) |
| Receptor status |
| Positive |
566 |
0.76 |
(0.59, 0.98) |
0.69 |
(0.48, 0.99) |
| Negative |
178 |
0.68 |
(0.48, 0.97) |
0.66 |
(0.44, 0.98) |
| *a hazard ratio of less than 1 indicates
that TAC is associated with a longer disease free survival or overall
survival compared to FAC. |
Non-Small Cell Lung Cancer (NSCLC)
The efficacy and safety of TAXOTERE has been evaluated in patients with unresectable, locally advanced or metastatic non-small cell lung cancer whose disease has failed prior platinum-based chemotherapy or in patients who are chemotherapy-naïve.
- Monotherapy with TAXOTERE for NSCLC Previously Treated with Platinum-Based
Chemotherapy
Two randomized, controlled trials established that a TAXOTERE dose of 75 mg/m2
was tolerable and yielded a favorable outcome in patients previously treated
with platinum-based chemotherapy (see below). TAXOTERE at a dose of 100 mg/m2,
however, was associated with unacceptable hematologic toxicity, infections,
and treatment-related mortality and this dose should not be used [see Boxed
Warning, Warnings and Precautions, Dosage
Adjustment During Treatment].
One trial (TAX317), randomized patients with locally advanced or metastatic
non-small cell lung cancer, a history of prior platinum-based chemotherapy,
no history of taxane exposure, and an ECOG performance status ≤2 to TAXOTERE
or best supportive care. The primary endpoint of the study was survival. Patients
were initially randomized to TAXOTERE 100 mg/m2 or best supportive
care, but early toxic deaths at this dose led to a dose reduction to TAXOTERE
75 mg/m2. A total of 104 patients were randomized in this amended
study to either TAXOTERE 75 mg/m2 or best supportive care.
In a second randomized trial (TAX320), 373 patients with locally advanced or
metastatic non-small cell lung cancer, a history of prior platinum-based chemotherapy,
and an ECOG performance status ≤2 were randomized to TAXOTERE 75 mg/m2,
TAXOTERE 100 mg/m2 and a treatment in which the investigator chose
either vinorelbine 30 mg/m2 days 1, 8, and 15 repeated every 3 weeks
or ifosfamide 2 g/m2 days 1-3 repeated every 3 weeks. Forty percent
of the patients in this study had a history of prior paclitaxel exposure. The
primary endpoint was survival in both trials. The efficacy data for the TAXOTERE
75 mg/m2 arm and the comparator arms are summarized in Table 16 and
Figures 3 and 4 showing the survival curves for the two studies.
Table 16 - Efficacy of TAXOTERE in the Treatment of Non-Small
Cell Lung Cancer Patients Previously Treated with a Platinum-Based Chemotherapy
Regimen (Intent-to-Treat Analysis)
| |
TAX317 |
TAX320 |
| |
Docetaxel
75 mg/m2
n=55 |
Best
Supportive
Care/75
n=49 |
Docetaxel
75 mg/m2
n=125 |
Control
(V/I)
n=123 |
| Overall Survival Log-rank Test |
p=0.01 |
p=0.13 |
Risk Ratio††, Mortality (Docetaxel: Control)
95% CI (Risk Ratio) |
0.56
(0.35, 0.88) |
0.82
(0.63, 1.06) |
| Median Survival 95% CI |
7.5 months*
(5.5, 12.8) |
4.6 months
(3.7, 6.1) |
5.7 months
(5.1, 7.1) |
5.6 months
(4.4, 7.9) |
| % 1-year Survival 95% CI |
37%*†
(24, 50) |
12%
(2, 23) |
30%*†
(22, 39) |
20%
(13, 27) |
Time to Progression
95% CI |
12.3 weeks*
(9.0, 18.3) |
7.0 weeks
(6.0, 9.3) |
8.3 weeks
(7.0, 11.7) |
7.6 weeks
(6.7, 10.1) |
| Response Rate |
5.5% |
Not Applicable |
5.7% |
0.8% |
| 95% CI |
(1.1, 15.1) |
|
(2.3, 11.3) |
(0.0, 4.5) |
| * p < 0.05; † uncorrected for multiple comparisons; †† a
value less than 1.00 favors docetaxel. |
Only one of the two trials (TAX317) showed a clear effect on survival, the
primary endpoint; that trial also showed an increased rate of survival to one
year. In the second study (TAX320) the rate of survival at one year favored
TAXOTERE 75 mg/m2.
Figure 3 - TAX317 Survival K-M Curves - TAXOTERE 75 mg/m2
vs. Best Supportive Care
Figure 4 - TAX320 Survival K-M Curves - TAXOTERE 75 mg/m2
vs. Vinorelbine or Ifosfamide Control
Patients treated with TAXOTERE at a dose of 75 mg/m2 experienced
no deterioration in performance status and body weight relative to the comparator
arms used in these trials.
- Combination Therapy with TAXOTERE for Chemotherapy-Naïve NSCLC
In a randomized controlled trial (TAX326), 1218 patients with unresectable
stage IIIB or IV NSCLC and no prior chemotherapy were randomized to receive
one of three treatments: TAXOTERE 75 mg/m2 as a 1 hour infusion immediately
followed by cisplatin 75 mg/m2 over 30-60 minutes every 3 weeks;
vinorelbine 25 mg/m2 administered over 6-10 minutes on days 1, 8,
15, 22 followed by cisplatin 100 mg/m2 administered on day 1 of cycles
repeated every 4 weeks; or a combination of TAXOTERE and carboplatin.
The primary efficacy endpoint was overall survival. Treatment with TAXOTERE+cisplatin did not result in a statistically significantly superior survival compared to vinorelbine+cisplatin (see table below). The 95% confidence interval of the hazard ratio (adjusted for interim analysis and multiple comparisons) shows that the addition of TAXOTERE to cisplatin results in an outcome ranging from a 6% inferior to a 26% superior survival compared to the addition of vinorelbine to cisplatin. The results of a further statistical analysis showed that at least (the lower bound of the 95% confidence interval) 62% of the known survival effect of vinorelbine when added to cisplatin (about a 2-month increase in median survival; Wozniak et al. JCO, 1998) was maintained. The efficacy data for the TAXOTERE+cisplatin arm and the comparator arm are summarized in Table 17.
Table 17 - Survival Analysis of TAXOTERE in Combination Therapy
for Chemotherapy-Naïve NSCLC
| Comparison |
Taxotere+Cisplatin
n=408 |
Vinorelbine+Cisplatin
n=405 |
| Kaplan-Meier Estimate of Median Survival |
10.9 months |
10.0 months |
| p-valuea |
0.122 |
| Estimated Hazard Ratiob |
0.88 |
| Adjusted 95% CIc |
(0.74, 1.06) |
a From the superiority test (stratified log rank)
comparing TAXOTERE+cisplatin to vinorelbine+cisplatin
bHazard ratio of TAXOTERE+cisplatin vs. vinorelbine+cisplatin.
A hazard ratio of less than 1 indicates that TAXOTERE+cisplatin is associated
with a longer survival.
cAdjusted for interim analysis and multiple comparisons. |
The second comparison in the study, vinorelbine+cisplatin versus TAXOTERE+carboplatin, did not demonstrate superior survival associated with the TAXOTERE arm (Kaplan-Meier estimate of median survival was 9.1 months for TAXOTERE+carboplatin compared to 10.0 months on the vinorelbine+cisplatin arm) and the TAXOTERE+carboplatin arm did not demonstrate preservation of at least 50% of the survival effect of vinorelbine added to cisplatin. Secondary endpoints evaluated in the trial included objective response and time to progression. There was no statistically significant difference between TAXOTERE+cisplatin and vinorelbine+cisplatin with respect to objective response and time to progression (see Table 18).
Table 18 - Response and TTP Analysis of TAXOTERE in Combination
Therapy for Chemotherapy-Naïve NSCLC
| Endpoint |
TAXOTERE+Cisplatin |
Vinorelbine+Cisplatin |
p-value |
Objective Response Rate
(95% CI)a |
31.6%
(26.5%, 36.8%) |
24.4%
(19.8%, 29.2%) |
Not Significant |
Median Time to
Progressionb
(95% CI)a |
21.4 weeks
(19.3, 24.6) |
22.1 weeks
(18.1, 25.6) |
Not Significant |
aAdjusted for multiple comparisons.
bKaplan-Meier estimates. |
Prostate Cancer
The safety and efficacy of TAXOTERE in combination with prednisone in patients with androgen independent (hormone refractory) metastatic prostate cancer were evaluated in a randomized multicenter active control trial. A total of 1006 patients with Karnofsky Performance Status (KPS) ≥ 60 were randomized to the following treatment groups:
- TAXOTERE 75 mg/m2 every 3 weeks for 10 cycles.
- TAXOTERE 30 mg/m2 administered weekly for the first 5 weeks in
a 6-week cycle for 5 cycles.
- Mitoxantrone 12 mg/m2 every 3 weeks for 10 cycles.
All 3 regimens were administered in combination with prednisone 5 mg twice daily, continuously.
In the TAXOTERE every three week arm, a statistically significant overall survival advantage was demonstrated compared to mitoxantrone. In the TAXOTERE weekly arm, no overall survival advantage was demonstrated compared to the mitoxantrone control arm. Efficacy results for the TAXOTERE every 3 week arm versus the control arm are summarized in Table 19 and Figure 5.
Table 19 - Efficacy of TAXOTERE in the Treatment of Patients
with Androgen Independent (Hormone Refractory) Metastatic Prostate Cancer (Intent-to-Treat
Analysis)
| |
TAXOTERE every 3
weeks |
Mitoxantrone every 3
weeks |
| Number of patients |
335 |
337 |
| Median survival (months) |
18.9 |
16.5 |
| 95% CI |
(17.0-21.2) |
(14.4-18.6) |
| Hazard ratio |
0.761 |
-- |
| 95% CI |
(0.619-0.936) |
-- |
| p-value* |
0.0094 |
-- |
| *Stratified log rank test. Threshold for statistical significance
= 0.0175 because of 3 arms. |
Gastric Adenocarcinoma
A multicenter, open-label, randomized trial was conducted to evaluate the safety
and efficacy of TAXOTERE for the treatment of patients with advanced gastric
adenocarcinoma, including adenocarcinoma of the gastroesophageal junction, who
had not received prior chemotherapy for advanced disease. A total of 445 patients
with KPS > 70 were treated with either TAXOTERE (T) (75 mg/m2 on
day 1) in combination with cisplatin (C) (75 mg/m2 on day 1) and
fluorouracil (F) (750 mg/m2 per day for 5 days) or cisplatin (100
mg/m2 on day 1) and fluorouracil (1000 mg/m2 per day for
5 days). The length of a treatment cycle was 3 weeks for the TCF arm and 4 weeks
for the CF arm. The demographic characteristics were balanced between the two
treatment arms. The median age was 55 years, 71% were male, 71% were Caucasian,
24% were 65 years of age or older, 19% had a prior curative surgery and 12%
had palliative surgery. The median number of cycles administered per patient
was 6 (with a range of 1-16) for the TCF arm compared to 4 (with a range of
1-12) for the CF arm. Time to progression (TTP) was the primary endpoint and
was defined as time from randomization to disease progression or death from
any cause within 12 weeks of the last evaluable tumor assessment or within 12
weeks of the first infusion of study drugs for patients with no evaluable tumor
assessment after randomization. The hazard ratio (HR) for TTP was 1.47 (CF/TCF,
95% CI: 1.19-1.83) with a significantly longer TTP (p=0.0004) in the TCF arm.
Approximately 75% of patients had died at the time of this analysis. Overall
survival was significantly longer (p=0.0201) in the TCF arm with a HR of 1.29
(95% CI: 1.04-1.61). Efficacy results are summarized in Table 20 and Figures
6 and 7.
Table 20 - Efficacy of TAXOTERE in the treatment of patients
with gastric adenocarcinoma
| Endpoint |
TCF
n=221 |
CF
n=224 |
Median TTP (months)
(95%CI) |
5.6
(4.86-5.91) |
3.7
(3.45-4.47) |
| Hazard ratio† (95%CI) |
0.68
(0.55-0.84) |
| *p-value |
0.0004 |
Median survival (months)
(95%CI) |
9.2
(8.38-10.58) |
8.6
(7.16-9.46) |
Hazard ratio†
(95%CI) |
0.77
(0.62-0.96) |
| *p-value |
0.0201 |
| Overall Response Rate (CR+PR) (%) |
36.7 25.4 |
| p-value |
0.0106 |
*Unstratified log-rank test
†For the hazard ratio (TCF/CF), values less than 1.00 favor the TAXOTERE
arm. |
Subgroup analyses were consistent with the overall results across age, gender and race.
Figure 6 - Gastric Cancer Study (TAX325) Time to Progression
K-M Curve
Figure 7 - Gastric Cancer Study (TAX325) Survival K-M Curve
Head and Neck Cancer
- Induction chemotherapy followed by radiotherapy (TAX323)
The safety and efficacy of TAXOTERE in the induction treatment of patients
with squamous cell carcinoma of the head and neck (SCCHN) was evaluated in a
multicenter, open-label, randomized trial (TAX323). In this study, 358 patients
with inoperable locally advanced SCCHN, and WHO performance status 0 or 1, were
randomized to one of two treatment arms. Patients on the TAXOTERE arm received
TAXOTERE (T) 75 mg/m2 followed by cisplatin (P) 75 mg/m2
on Day 1, followed by fluorouracil (F) 750 mg/m2 per day as a continuous
infusion on Days 1-5. The cycles were repeated every three weeks for 4 cycles.
Patients whose disease did not progress received radiotherapy (RT) according
to institutional guidelines (TPF/RT). Patients on the comparator arm received
cisplatin (P) 100 mg/m2 on Day 1, followed by fluorouracil (F) 1000
mg/m2/day as a continuous infusion on Days 1-5. The cycles were repeated
every three weeks for 4 cycles. Patients whose disease did not progress received
RT according to institutional guidelines (PF/RT). At the end of chemotherapy,
with a minimal interval of 4 weeks and a maximal interval of 7 weeks, patients
whose disease did not progress received radiotherapy (RT) according to institutional
guidelines. Locoregional therapy with radiation was delivered either with a
conventional fraction regimen (1.8 Gy-2.0 Gy once a day, 5 days per week for
a total dose of 66 to 70 Gy) or with an accelerated/hyperfractionated regimen
(twice a day, with a minimum interfraction interval of 6 hours, 5 days per week,
for a total dose of 70 to 74 Gy, respectively). Surgical resection was allowed
following chemotherapy, before or after radiotherapy.
The primary endpoint in this study, progression-free survival (PFS), was significantly longer in the TPF arm compared to the PF arm, p=0.0077 (median PFS: 11.4 vs. 8.3 months respectively) with an overall median follow up time of 33.7 months. Median overall survival with a median follow-up of 51.2 months was also significantly longer in favor of the TPF arm compared to the PF arm (median OS: 18.6 vs. 14.2 months respectively). Efficacy results are presented in Table 21 and Figures 8 and 9.
Table 21 - Efficacy of TAXOTERE in the induction treatment
of patients with inoperable locally advanced SCCHN (Intent-to-Treat Analysis)
| ENDPOINT |
TAXOTERE+
Cisplatin+
Fluorouracil
n=177 |
Cisplatin+
Fluorouracil
n=181 |
Median progression free survival (months)
(95%CI) |
11.4
(10.1-14.0) |
8.3
(7.4-9.1) |
Adjusted Hazard ratio
(95%CI) |
0.71
(0.56-0.91) |
| *p-value |
0.0077 |
Median survival (months)
(95%CI) |
18.6
(15.7-24.0) |
14.2
(11.5-18.7) |
Hazard ratio
(95%CI) |
0.71
(0.56-0.90) |
| **p-value |
0.0055 |
Best overall response (CR + PR) to
chemotherapy (%)
(95%CI) |
67.8
(60.4-74.6) |
53.6
(46.0-61.0) |
| ***p-value |
0.006 |
Best overall response (CR + PR) to study
treatment [chemotherapy +/- radiotherapy] (%)
(95%CI) |
72.3
(65.1-78.8) |
58.6
(51.0-65.8) |
| ***p-value |
0.006 |
A Hazard ratio of less than 1 favors TAXOTERE+Cisplatin+Fluorouracil
* Stratified log-rank test based on primary tumor site
** Stratified log-rank test, not adjusted for multiple comparisons
*** Chi square test, not adjusted for multiple comparisons |
Figure 8 - TAX323 Progression-Free Survival K-M Curve
Figure 9 - TAX323 Overall Survival K-M Curve
- Induction chemotherapy followed by chemoradiotherapy (TAX324)
The safety and efficacy of TAXOTERE in the induction treatment of patients
with locally advanced (unresectable, low surgical cure, or organ preservation)
SCCHN was evaluated in a randomized, multicenter open-label trial (TAX324).
In this study, 501 patients, with locally advanced SCCHN, and a WHO performance
status of 0 or 1, were randomized to one of two treatment arms. Patients on
the TAXOTERE arm received TAXOTERE (T) 75 mg/m2 by IV infusion on
day 1 followed by cisplatin (P) 100 mg/mm2 administered as a 30-minute to three-hour
IV infusion, followed by the continuous IV infusion of fluorouracil (F) 1000
mg/m2/day from day 1 to day 4. The cycles were repeated every 3 weeks for 3
cycles. Patients on the comparator arm received cisplatin (P) 100 mg/mm2 as a
30-minute to three-hour IV infusion on day 1 followed by the continuous IV infusion
of fluorouracil (F) 1000 mg/mm2/day from day 1 to day 5. The cycles were repeated
every 3 weeks for 3 cycles.
All patients in both treatment arms who did not have progressive disease were to receive 7 weeks of chemoradiotherapy (CRT) following induction chemotherapy 3 to 8 weeks after the start of the last cycle. During radiotherapy, carboplatin (AUC 1.5) was given weekly as a one-hour IV infusion for a maximum of 7 doses. Radiation was delivered with megavoltage equipment using once daily fractionation (2 Gy per day, 5 days per week for 7 weeks for a total dose of 70-72 Gy). Surgery on the primary site of disease and/or neck could be considered at anytime following completion of CRT.
The primary efficacy endpoint, overall survival (OS), was significantly longer (log-rank test, p=0.0058) with the TAXOTERE-containing regimen compared to PF [median OS: 70.6 versus 30.1 months respectively, hazard ratio (HR)=0.70, 95% confidence interval (CI)= 0.54 - 0.90]. Overall survival results are presented in Table 22 and Figure 10.
Table 22 - Efficacy of TAXOTERE in the induction treatment
of patients with locally advanced SCCHN (Intent-to-Treat Analysis)
| ENDPOINT |
TAXOTERE+
Cisplatin+ Fluorouracil
n=255 |
Cisplatin+
Fluorouracil
n=246 |
Median overall survival (months)
(95% CI) |
70.6
(49.0-NE) |
30.1
(20.9-51.5) |
Hazard ratio:
(95% CI) |
0.70
(0.54-0.90) |
| *p-value |
0.0058 |
A Hazard ratio of less than 1 favors TAXOTERE+cisplatin+fluorouracil
* un-adjusted log-rank test
NE - not estimable |
Figure 10 - TAX324 Overall Survival K-M Curve
Last updated on RxList: 10/18/2007