Abstract
Background
Despite its toxicity, cisplatin every 3 weeks (q3w) is the standard potentiation of chemo-radiotherapy for head and neck squamous cell carcinoma. This study aimed to determine whether weekly cisplatin (q1w) could be a safe and effective alternative.
Patients and methods
Two hundred and sixty-two patients with head and neck squamous cell carcinoma, irradiated in our institution with cisplatin (q1w or q3w) between January 2004 and December 2008, were retrospectively included. Overall survival (OS) and progression-free survival (PFS) were evaluated. Survival distributions were estimated by Kaplan–Meier method and compared using the log-rank test. Prognostic effect of chemo-radiotherapy was explored using Cox model.
Results
A total of 165 and 97 patients received q1w and q3w cisplatin, respectively. Median age, stage at diagnosis, alcohol consumption, intensity-modulated radiation therapy use, median weight, and renal failure before radiotherapy were significantly different, showing lower risk in the q3w group. Q3w cisplatin was found to be more toxic in terms of weight loss, renal failure, worse chemotherapy plan completion, and grade 3/4 mucositis and dermatitis, with more patients requiring analgesics, secondary hospitalization, and radiotherapy interruption (≥3 days), and patients affected by long-term toxicities. With a median follow-up of 73 months (95% confidence interval [CI] [68.9–76.2]), OS was found to be significantly better with q3w (5 years OS: 62.3%; 95% CI [51.6–71.3]) than with q1w cisplatin (5 years OS: 52.6%; 95% CI [44.5–60.0]) (log-rank P=0.0146). More number of patients treated according to the q1w schedule experienced a recurrence: 47.3% vs 30.9% (P=0.009). Thus, the PFS for q3w schedule was found to be globally better (5 years PFS: 55.8%; 95% CI [45.0–65.3]) than for q1w schedule (5 years PFS: 43.6%; 95% CI [35.9–51.0]) (log-rank P=0.0161). However, both multivariate analyses, OS and PFS, produce no significant hazard ratio for chemo-radiotherapy modality once adjusted on unbalanced covariates according to the descriptive analysis.
Conclusion
Though q1w seemed to be safer than q3w according to the descriptive analysis, multivariate analyses failed to conclude about its efficiency. Therefore, we conclude that the q3w schedule should remain the standard and prospective comparisons are needed.
Keywords: head and neck cancer, radiotherapy potentiation, chemoradiation, cisplatin
Introduction
The incidence of head and neck squamous cell carcinoma (HNSCC) in the western countries is approximately 120,000 patients1 with approximately two-thirds of locoregionally advanced head and neck squamous cell carcinoma (LAHNSCC). Radiotherapy (RT) is a major pillar of treatment for LAHNSCC and is given as exclusive treatment or as adjuvant treatment after surgery.2 For both adjuvant and exclusive treatment, chemo-radiotherapy (CT-RT) with every 3 weeks cisplatin (q3w) at a dose of 100 mg/m2 at days 1, 22, and 43 gives better overall survival (OS) than RT alone in several Phase III studies.3–6 It is confirmed in a large meta-analysis on 50 concomitant trials: the hazard ratio (HR) for OS was 0.81 (95% confidence interval [CI] [0.78–0.86], P<0.0001) with an absolute benefit of 6.5% at 5 years in favor of CT-RT vs RT alone.7 However, this increased OS was associated with an increased toxicity. For example, in an adjuvant study, the rate of grade 3/4 acute toxicities was increased from 34% with RT alone to 77% (P<0.001) with CT-RT.5 The late toxicity increased in the q3w schedule compared with the q1w schedule. Although only few data are published, a small study reported 47% of grade 3/4 late toxicities in the RT group against 82% (P=0.02) in the CT-RT group.8
Indeed, the major requirement now is to decrease the toxicity associated with CT-RT without altering its efficacy. The three major tumor types for which radiation is potentialized by cisplatin are HNSCC, undifferentiated nasopharyngeal carcinoma (UCNT), and cervical cancers. For the two later localizations, weekly cisplatin (q1w) at the dose of 40 mg/m2 is the standard potentiation, even though no direct comparison was done with the q3w cisplatin.9–14 For UCNT, q1w cisplatin was feasible and seemed to be less toxic than q3w cisplatin. In terms of OS, a Phase III study demonstrated that RT-CT with q1w cisplatin compared to RT alone increased the 5 years OS from 59% (95% CI [50.9–66.2]) to 70% (95% CI [63.4–7.3]) on locoregionally advanced nasopharyngeal carcinoma (HR =0.71, 95% CI [0.50–1.00], P=0.049).11 In two meta-analyses consisting of eight trials with 1,753 patients and 19 trials with 4,798 patients demonstrated a HR of 0.82 (95% CI [0.71–0.95], P=0.006)9 and an absolute benefit of 6.5% at 5 years, respectively.10 This benefit of 6.5% was similar to the benefit obtained by using q3w cisplatin in LAHNSCC.7 Although no study demonstrated equivalence or noninferiority of weekly cisplatin compared to q3w cisplatin as potentiation for RT in head and neck cancer, the q1w schedule is largely used due to its lower toxicity as it is expected to have efficacy similar to that of the q3w schedule.
This study was designed to assess to what extent should q1w cisplatin replace the q3w schedule, to obtain similar survival results and better tolerability, and can be a basis for a randomized study.
Patients and methods
Retrieval procedure and selection of patient records
The data of all patients without metastasis with histologically confirmed LAHNSCC, irradiated with concurrent cisplatin (q1w or q3w) in our institution (Centre Léon Bérard, Lyon, France) between January 2004 and December 2008, were retrospectively reviewed. Patients received an exclusive RT or RT after surgery and/or induction chemotherapy.
Collection of patients’ data was in rules with CNIL (Commission nationale de l’informatique et des libertés, French authority to protect the use of patients’ data) and the confidentiality of the patients was preserved. This study was authorized by the ethics committee of the Centre Léon Bérard (Lyon, France).
Treatment
RT was delivered over a 7-week period using conventional fractionation (total dose, 60–70 Gy). Generally, RT starts 3–7 weeks after completion of chemotherapy or surgery. Q3w chemotherapy was planned to be delivered (100 mg/m2) at days 1, 22, and 43 from the start of RT, whereas q1w cisplatin (40 mg/m2) was planned to be delivered each week during the RT treatment. Patients were hospitalized 24–48 hours for q3w cisplatin administration, and an intravenous hyperhydration with 2 L/m2 of 0.9% NaCl or 5% glucose (with 2 g/L KCl and 4 g/L NaCl) was given; in the q1w schedule, cisplatin was administered ambulatory with 1L intravenous hydration and devices for orally hydration at home. All patients received adequate antiemetic prophylaxis. The choice between q1w and q3w was left to the appraisal of the radiotherapist, which was largely subjective and needed a multivariate analysis, but the considerations were age, weight loss before radiation, creatinine clearance, performance status, and the use of induction chemotherapy. In practice, such radiotherapists use systematically q1w cisplatin, and other radiotherapists use q3w cisplatin. In case of poor CT-RT tolerability, the patients could be re-hospitalized or receive a nasogastric intubation.
Statistical analysis
Study population was first described and data were compared between CT-RT groups (q1w vs q3w) using Student’s t-test or nonparametrical Wilcoxon’s test for continuous data and Pearson’s chi-square test or Fisher’s exact test for categorical data.
Then, OS and progression-free survival (PFS) analyses were performed. Because of the presence of many comorbidities in the patients with LAHNSCC, time to progression (TTP) study was also done to compare the CT-RT schedules (q1w and q3w).
OS was defined as the time from RT onset to the date of death (due to any cause) or date of last follow-up (for censored patients); PFS as the time from RT onset to the date of recurrence (local or metastatic) or death (due to any cause) or date of last follow-up (for censored patients); and TTP as the time from RT onset to the date of recurrence (local or metastatic) or death due to cancer or date of last follow-up (for censored patients). Survival distributions were estimated by Kaplan–Meier method and compared between CT-RT groups using the log-rank test. Prognostic effect of CT-RT group was explored using proportional hazard Cox model. As the purpose of this study was to estimate the potential effect of the CT-RT modality (q1w or q3w) on survival, the strategy of modeling implemented consisted in adjusting this variable on the unbalanced covariates revealed by the descriptive analysis, as they may be the confounding factors. All interactions between the type of CT-RT and these variables were also tested and incorporated into the multivariate model (if significant at 5% level).
All analyses were performed using the SAS software version 9.3 (SAS institute Inc, Cary, NC, USA).
Results
Patients’ characteristics
Between January 2004 and December 2008, 165 patients without metastasis with LAHNSCC received chemoradiation with q1w cisplatin and 97 with q3w cisplatin in a single institution (Centre Léon Bérard) and were retrospectively included in our study.
The characteristics of patients and tumors are summarized in Table 1. About half of the patients (47.9%) had oropharyngeal cancer and 38.3% received induction chemotherapy (33.9% of patients were treated with q1w CT-RT and 45.8% with q3w CT-RT) without significant difference at 5% level (P=0.057).
Table 1.
Characteristics of patients and tumors at the onset of radiotherapy
| q1w cisplatin (N=165) | q3w cisplatin (N=97) | Test | |
|---|---|---|---|
| Age at treatment initiation (years) | |||
| Median (range) | 58.5 (33.6–79.7) | 54.4 (19.4–70.7) | P<0.001 |
| Sex | |||
| Male | 144 (87.3%) | 83 (85.6%) | P=0.695 |
| Performance status | |||
| 0 | 59 (47.6%) | 35 (47.3%) | P=0.424 |
| 1 | 54 (43.5%) | 33 (44.6%) | |
| 2 | 11 (8.9%) | 4 (5.4%) | |
| 3 | – | 1 (1.4%) | |
| 4 | – | 1 (1.4%) | |
| Unknown | 41 | 23 | |
| Consumptions | |||
| Alcohol | 124/155 (80%) | 65/95 (68.4%) | P=0.039 |
| Tobacco | 144/159 (90.6%) | 83/95 (87.4%) | P=0.424 |
| History of head and neck cancer | |||
| 12 (7.3%) | 2 (2.1%) | P=0.089 | |
| Weight before treatment (kg) | |||
| Median (range) | 65 (39–105) | 71 (37.5–140) | P=0.021 |
| Clearance of creatinine before treatment (mL/min) | |||
| Median (range) | 91 (39–358) | 104 (46–248) | P=0.003 |
| Localization of tumor | |||
| Oral cavity | 24 (14.6%) | 13 (13.4%) | P=0.862 |
| Oropharynx | 81 (49.4%) | 44 (45.4%) | |
| Hypopharynx | 27 (16.5%) | 17 (17.5%) | |
| Larynx | 29 (17.7%) | 22 (22.7%) | |
| Others | 3 (1.8%) | 1 (1%) | |
| Unknown | 1 | – | |
| Stage of the disease | |||
| I | 4 (2.4%) | – | P=0.002 |
| II | 11 (6.7%) | 7 (7.3%) | |
| III | 50 (30.3%) | 12 (12.5%) | |
| IVa and IVb | 100 (60.6%) | 77 (80.2%) | |
| Unknown | – | 1 | |
| Type of chemoradiation | |||
| Exclusive | 42 (25.5%) | 36 (37.1%) | P=0.046 |
| Adjuvant | 123 (74.5%) | 61 (62.9%) | |
| Prior neoadjuvant chemotherapy | |||
| Yes | 56 (33.9%) | 44 (45.8%) | P=0.057 |
| No | 109 (66.1%) | 52 (54.2%) | |
| Unknown | – | 1 | |
Abbreviations: q1w, once weekly; q3w, every 3 weeks.
Six characteristics were significantly different between patients treated with q1w and q3w CT-RT: median age at treatment initiation (58.5 [min–max: 33.6–79.7] vs 54.4 years old [19.4–70.7], respectively; P<0.001), alcohol consumption (80% vs 68.4%; P=0.039), stage IV at diagnosis (60.6% vs 80.2%; P=0.002), median weight before RT (65 kg [min–max: 39–105] vs 71 kg [37.5–140]; P=0.021), median clearance of creatinine before RT (91 mL/min [min–max: 39–358] vs 104 mL/min [46–248]; P=0.003), and radiation as adjuvant treatment (74.5% vs 62.9%; P=0.046).
Toxicity of the chemoradiation
Data about toxicities of chemoradiation and their management are summarized in Tables 2 and 3, respectively. As expected, the q3w potentiation was significantly more toxic when compared with q1w in terms of weight loss (85.4% vs 74.2%; P=0.010), grade 3/4 mucositis (34% vs 12.1%; P<0.001), dermatitis (7.2% vs 1.2%; P=0.014), and decrease of creatinine clearance (median variation between the beginning and the end of RT in mL/min: −19.4 [range: −191.9; 14.3] vs −7.1 [range: −69; 79.6], P<0.001). More number of patients in q3w group needed analgesics (90.8% vs 71.4%; P=0.002), secondary hospitalization (30.9% vs 7.9%; P<0.001), interruption of RT for more than 3 days (7.4% vs 1.8%; P=0.040), and also interruption of chemotherapy (43.8% vs 30.3%; P=0.028). Finally, only 42.2% of patients in the q3w group received chemotherapy as planned vs 66.7% in the q1w group (P<0.001). But no significant difference was noticed in terms of high-grade renal failure, nausea/vomiting, dysphagia, and nutritional support.
Table 2.
Toxicity of chemoradiation
| q1w cisplatin (N=165) | q3w cisplatin (N=97) | Test | |
|---|---|---|---|
| Mucositis | |||
| All grades | 101 (61.2%) | 85 (87.6%) | P<0.001 |
| Grade 3–4 | 20 (12.1%) | 33 (34%) | P<0.001 |
| Dermatitis | |||
| All grades | 76 (46.1%) | 71 (73.2%) | P<0.001 |
| Grade 3–4 | 2 (1.2%) | 7 (7.2%) | P=0.014 |
| Nausea/vomiting | |||
| All grades | 34 (20.6%) | 50 (51.5%) | P<0.001 |
| Grade 3–4 | 4 (2.4%) | 4 (4.1%) | P=0.473 |
| Transitory renal failure | |||
| All grades | 51/141 (36.2%) | 45/90 (50%) | P=0.038 |
| Grade 3–4 | 2/141 (1.4%) | 2/90 (2.2%) | P=0.644 |
| Variation of creatinine clearance during RT (mL/min) | |||
| Median (range) | n=125 | n=86 | P<0.001 |
| 7.1 (69.0–79.6) | 19.4 (191.9–14.3) | ||
| Dysphagia | |||
| All grades | 79/164 (48.2%) | 62 (63.9%) | P=0.014 |
| Grade 3–4 | 20/164 (12.2%) | 13 (13.4%) | P=0.777 |
| Weight loss | |||
| Yes | 121/163 (74.2%) | 82/96 (85.4%) | P=0.010 |
| Median (range) | 3 (12–4) | 4 (20–3.5) | P=0.002 |
| Other grade 3–4 toxicities | |||
| Yes | 14/66 (21.2%) | 17/46 (37.0%) | P=0.067 |
Abbreviations: q1w, once weekly; q3w, every 3 weeks; RT, radiotherapy.
Table 3.
Management of the toxicities due to chemoradiation
| q1w cisplatin (N=165) | q3w cisplatin (N=97) | Test |
|---|---|---|
| Temporary discontinuation of RT for toxicity | ||
| 9 (5.5%) | 11 (11.3%) | P=0.083 |
| Temporary arrest of RT ≥3 days | ||
| 3/164 (1.8%) | 7/94 (7.4%) | P=0.040 |
| Arrest of CT during RT | ||
| 50 (30.3%) | 42/96 (43.8%) | P=0.028 |
| Completion as planned of CT | ||
| 86/129 (66.7%) | 35/83 (42.2%) | P<0.001 |
| Secondary hospitalization | ||
| 13/164 (7.9%) | 30 (30.9%) | P<0.001 |
| Use of analgesics | ||
| 65/91 (71.4%) | 69/76 (90.8%) | P=0.002 |
| Need of nutritional support | ||
| 41/83 (49.4%) | 33/58 (56.9%) | P=0.380 |
Abbreviations: q1w, once weekly; q3w, every 3 weeks; RT, radiotherapy; CT, chemotherapy.
Survival analysis
With a median follow-up of 73 months (95% CI [68.9–76.2]) and 125 deaths (47.7%) registered (38.1% and 53.3% on q3w and q1w group, respectively), the 3 years OS and the 5 years OS rates for all the patients were 63.9% (95% CI [57.6–69.5]) and 56.2% (95% CI [49.8–62]), respectively. OS was studied according to the type of potentiation, a significant difference in OS was found between the q1w and the q3w schedules (log-rank P=0.0146), in favor of the q3w schedule with 3 years OS rate of 71.3% (95% CI [61–79.3]) vs 59.6% for q1w group (95% CI [51.6–66.7]) and a 5 years OS rate of 62.3% (95% CI [51.6–71.3]) as against 52.6% (95% CI [44.5–60]) for the patients treated with q1w (Figure 1).
Figure 1.
Overall survival according to the type of chemotherapy.
Abbreviations: q1w, once weekly; q3w, every 3 weeks; pts, patients.
More number of patients treated according to the q1w schedule experienced a recurrence of their disease, 47.3% (n=78) vs 30.9% (n=30) for the patients treated with q3w cisplatin (P=0.009). The 3 years PFS and the 5 years PFS rates for all the patients were 56.2% (95% CI [49.9–62]) and 48.1% (95% CI [41.8–54]), respectively. PFS, studied according to the type of potentiation, was significantly in favor of the q3w schedule (log-rank P=0.0161) with 3 years PFS rate of 62.9% for the q3w group (95% CI [52.3–71.7]) vs 52.3% for the q1w group (95% CI [44.4–59.7]) and 5 years PFS rate of 55.8% for the q3w group (95% CI [45–65.3]) vs 43.6% for the q1w group (95% CI [35.9–51]) (Figure 2).
Figure 2.
Progression-free survival according to the type of chemotherapy.
Abbreviations: q1w, once weekly; q3w, every 3 weeks; pts, patients.
Since patients with LAHNSCC have a lot of comorbidities, the TTP should also be a good parameter to compare the two schedules. Among the 125 deceased patients, 88 died of cancer whereas 37 died of comorbidities. The 88 patients who died of cancer had previously relapsed. The 3 years and the 5 years TTP rates for all the patients were 64.0% (95% CI [57.7–69.7]) and 57.8% (95% CI [51.3–63.9]), respectively. By taking the type of potentiation into consideration, TTP univariate analysis favored the q3w schedule (log-rank P=0.0072) with a 3 years TTP rate of 71.9% (95% CI [61.4–79.9]) vs 59.4% for patients treated with q1w (95% CI [51.2–66.7]) and 5 years TTP rate of 68.9% (95% CI [58.1–77.5]) vs 51.4% for q1w group (95% CI [43.1–59.1]) (Figure 3).
Figure 3.
Time to progression according to the type of chemotherapy.
Abbreviations: q1w, once weekly; q3w, every 3 weeks; pts, patients.
In order to assess the relationship between survival rates (OS, PFS, and TTP) and CT-RT group, by taking into account the differences between the two groups revealed by the comparative description of study population, a multivariate Cox model was built to estimate CT-RT group effect by adjusting on the following potential confounding factors: age at RT initiation, alcohol consumption, prior neoadjuvant chemotherapy (CT), type of chemoradiation (exclusive or adjuvant), weight and clearance of creatinine (renal failure or not) before treatment, and tumor stage (T and N of the TNM classification). Finally, OS multivariate analysis revealed no significant prognostic effect on the CT-RT group. In the same way, the tendency of a deleterious effect of q1w on survival was not confirmed by PFS or TTP multivariate analyses. Results regarding the analysis done on the subgroup of patients who did not receive induction chemotherapy (n=161) are similar.
Discussion
Our study is consistent with the previously published mono-arm studies which demonstrated that weekly cisplatin concurrent with RT is well tolerated.15–22 In this study, the largest published to date, weekly cisplatin is significantly better tolerated than q3w cisplatin. It is confirmed by only one comparative study,23 whereas three did not show any difference24–26 and one found 3qw schedule to be less toxic.27
Even if weekly cisplatin is probably less toxic than q3w administration, which is presently the standard treatment, our survival results are consistent with the idea that the q3w administration should remain the standard. At the first look the trend according to which the OS (and PFS and TTP) would be better on patients treated by q3w schedule to the detriment of those weekly treated (q1w) was quite strong according to the Kaplan–Meier curves. However, this tendency (out of favor of the experimental arm [q1w schedule]) was not confirmed (at 5% level) according to the results of the multivariate Cox models.
As this study is both monocentric and retrospective, these results may just reflect one’s own practice and may suffer from a selection bias that can affect the constitution of the two CT-RT groups, since the clinical reality of a patient guides the indication of CT-RT (q3w or q1w). A plausible hypothesis would be that q3w treatment plan is priority intended for patients expected to support such boost of chemotherapy and let q1w to weaker patients. In fact, as the descriptive analysis illustrates, the patients who received the q1w chemotherapy presented more deleterious baseline characteristics than the patients treated every 3 weeks (q3w): older and slimmer patients before RT onset, more alcohol consumers, more renal failure before RT. On the contrary, patients of the q3w arm presented more advanced tumors (stage IV) and node involvement at diagnosis. These differences constitutes a major limitation that prevents us from demonstrating in a formal way the potential substitutability of the weekly chemotherapy to the chemotherapy administered every 3 weeks. For that purpose, a randomized and comparative trial, to insure the comparability between the groups (which is lacking in this study), would be necessary.
When our results were compared to those of the literature, we noticed that the absolute survival difference between the two CT-RT groups of approximately 10%, at least found here (5 years OS, PFS, and TTP rates), was similar to that observed in a meta-analysis which assessed the benefit of chemoradiation against RT alone,7 suggesting that q1w cisplatin could be of limited interest. But, as said, the two groups in our study are not well balanced and no definitive conclusion could be drawn on the basis of our results. There is no convincing comparative study in the literature to assess the equivalence of q1w. Indeed, the five published studies dedicated to that subject did not demonstrate any difference in terms of efficacy, but they included only approximately 5024–27 or 9423 patients. On the other hand, mono-arm studies were conducted and results were compared with historical data of 3qw cisplatin: five studies seemed to be in favor of q1w,15,16,18–20 one was with deleterious effects,21 and one was without benefit.17 In this last study, which included 103 patients retrospectively, there was no cumulative effect of the dose of cisplatin, suggesting again that weekly cisplatin could be of little interest when compared with RT alone. The only comparative study that demonstrated significant benefit of weekly cisplatin added to RT vs RT alone included only 83 patients,22 which is not sufficient to assess a new standard. Hence, for eligible patients the q3w schedule should remain the gold standard. In order to decrease the toxicity of q3w cisplatin, we launched a program in our institution to perfuse patients at home for 5 days after chemotherapy with 1 L of NaCl at the night.
On the contrary to HNSCC, the potentiation of radiation by weekly cisplatin at the dose of 40 mg/m2 is a validated standard for squamous cervical cancer12–14 and undifferentiated carcinoma of the nasopharynx (UCNT).11 For UCNT, other studies demonstrated the benefit of the 3qw cisplatin28 or high-dose scheme,29 but no direct comparative studies are available to attest the superiority of one schedule or their equivalence.
Since no large trial validated the superiority of weekly cisplatin potentiation compared with RT alone, it remains unclear as to which type of potentiation should be proposed to patients ineligible for 3qw cisplatin. Weekly carboplatin was not validated.29,30 The combination of carboplatin and fluorouracil brings positive results but is also toxic and probably not indicated for patients ineligible to q3w cisplatin.4 Cetuximab should be considered since it is superior to exclusive RT alone.31 But it did not demonstrate significant benefit for patients older than 65 years, the most numerous candidates for potentiation other than q3w. For eligible patients, no direct study compared exclusive RT potentiated by q3w cisplatin or cetuximab. Presently, the only indirect monocentric study suggests that cetuximab is not as efficient, but this small retrospective study cannot bring definitive response.32 For adjuvant RT, cetuximab has no authorization. After induction chemotherapy, cetuximab could be as efficient as q3w cisplatin for early local control,33 but no potentiation (cisplatin or cetuximab) demonstrated any superiority to RT alone.
Conclusion
To conclude, the temptation of potentiation of RT for LAHN-SCC with q1w cisplatin, in order to decrease the toxicity and increase the future quality of life, should not be recommended outside clinical trials, since our results do not suggest any strong survival improvement. That encourages us to consider the use of weekly cisplatin with very high precaution for the moment and to powerfully explore q3w alternatives, thanks to the large comparative clinical trials. In routine practice, if patients are fit, q3w cisplatin should remain the standard potentiation of RT for LAHNSCC.
Footnotes
Disclosure
The authors report no conflicts of interest in this work.
This paper was presented at the 2013 ASCO annual meeting as a poster presentation with interim findings. The poster’s abstract was published in “Poster Abstracts” in J Clin Oncol. 31, 2013 (suppl; abstr 6056): http://meetinglibrary.asco.org/content/112388-132. The actual paper, however, has never been published.
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