Skip to content

Advertisement

BMC Cancer

Research article
Open Access
Open Peer Review

This article has Open Peer Review reports available.

How does Open Peer Review work?

ERCC1 and BRCA1 mRNA expression levels in metastatic malignant effusions is associated with chemosensitivity to cisplatin and/or docetaxel

  • Lifeng Wang1,
  • Jia Wei1,
  • Xiaoping Qian1,
  • Haitao Yin1,
  • Yang Zhao2,
  • Lixia Yu1,
  • Tingting Wang1 and
  • Baorui Liu1Email author
BMC Cancer20088:97

https://doi.org/10.1186/1471-2407-8-97

©  Wang et al; licensee BioMed Central Ltd. 2008

Received: 25 October 2007

Accepted: 11 April 2008

Published: 11 April 2008

Open Peer Review reports

Abstract

Background

One of the major challenges in currently chemotherapeutic theme is lacking effective biomarkers for drug response and sensitivity. Our current study focus on two promising biomarkers, ERCC1 (excision repair cross-complementing group 1) and BRCA1 (breast cancer susceptibility gene 1). To investigate their potential role in serving as biomarkers for drug sensitivity in cancer patients with metastases, we statistically measure the mRNA expression level of ERCC1 and BRCA1 in tumor cells isolated from malignant effusions and correlate them with cisplatin and/or docetaxel chemosensitivity.

Methods

Real-time quantitative PCR is used to analysis related genes expression in forty-six malignant effusions prospectively collected from non-small cell lung cancer (NSCLC), gastric and gynecology cancer patients. Viable tumor cells obtained from malignant effusions are tested for their sensitivity to cisplatin and docetaxel using ATP-TCA assay.

Results

ERCC1 expression level is negatively correlated with the sensitivity to cisplatin in NSCLC patients (P = 0.001). In NSCLC and gastric group, BRCA1 expression level is negatively correlated with the sensitivity to cisplatin (NSCLC: P = 0.014; gastric: P = 0.002) while positively correlated with sensitivity to docetaxel (NSCLC: P = 0.008; gastric: P = 0.032). A significant interaction is found between ERCC1 and BRCA1 mRNA expressions on sensitivity to cisplatin (P = 0.010, n = 45).

Conclusion

Our results demonstrate that ERCC1 and BRCA1 mRNA expression levels are correlated with in vitro chemosensitivity to cisplatin and/or docetaxel in malignant effusions of NSCLC and gastric cancer patients. And combination of ERCC1 and BRCA1 may have a better role on predicting the sensitivity to cisplatin than the single one is considered.

Keywords

DocetaxelGastric Cancer PatientNucleotide Excision RepairMalignant Pleural EffusionBRCA1 Expression

Background

The lack of understanding and accounting for inter-patient variability in drug efficacy is one of the handicaps in the field of chemotherapy, which inevitably leads to the unpredictable disease responses and patient toxicities. New advanced technology, such as phamacogenomics, offers us a more efficient tool to explore the candidate genes that influence drug activity and toxicity. Such studies make it possible to perform tailor chemotherapy based on the specific genetic profile of individual patients [1, 2]. Moreover, establishing any potent biomarkers for chemotherapy resistance will allow for the adoption of a better chemotherapeutic regimen, which will maximize efficacies and minimize toxicities of chemotherapy.

Genetic alterations are one of the major reasons for chemo-resistant in metastases[3]. Given the complicated biological mechanisms evolved in the disease progress and the heterogeneity between primary tumor and metastatic tumor[3, 4], certain biomarkers, which have been proved to be effective to specific drug sensitivity in primary tumor-based studies, may not always serve the same way in metastases. For example, the higher expression of Xeroderma Pigmentosum A in metastatic effusion is associated with better response to chemotherapy in ovarian cancer patients, paradoxically to the results in primary tumor [5] However, low expression of thymidylate synthase (TS) in metastases is associated with response to 5-FU based therapy in advanced gastric disease [6, 7], paralleling to those findings based on primary tumor tissues [8]. In order to develop better therapies and improve patients' outcome, one of the urgent work is to explore more effective biomarkers for chemosensitivity in metastases, which is the leading cause of cancer-related death in the world [4].

The excision repair cross-complementing group 1 gene (ERCC1), an essential member of the nucleotide excision repair (NER) pathway which accounts for the majority of platinum-DNA adduct repair, has been established as a useful molecular marker for NER activity. Early studies have shown that higher ERCC1 mRNA levels are associated with a more active DNA repair process in various tissues [9]. Interestingly, ERCC1 expression is also associated with cellular and clinical resistance to platinum compounds and to platinum-based chemotherapy, including lung and gastric malignancies [10–12]. Breast cancer susceptibility gene 1 (BRCA1), an essential component in multiple DNA damage repair pathways and pathways involved in cellular responses to microtubule damage, is considered to be a differential modulator of survival with cisplatin and taxanes [13–16]. Preclinical and clinical studies have reported that BRCA1 level is associated with cisplatin [14, 17] and taxanes chemosensitivity [18, 19]. Although above studies suggested that both ERCC1 and BRCA1 may serve as effective biomarkers for chemosensitivity in cancer patients with primary tumor, the information on these biomarkers is still limited in metastases.

Current study is therefore designed to explore the possibility of using ERCC1 and BRCA1 as two effective drug sensitivity biomarkers in malignant effusion specimens, in which all malignant cells are metastatic. We measured mRNA level of ERCC1 and BRCA1 in tumor cells isolated from malignant effusions and correlated them with cisplatin and/or docetaxel chemosensitivity in vitro. And we also verified the effect of combination ERCC1 and BRCA1 on the prediction of chemosensitivity to cisplatin.

Methods

Patients

All specimens and relevant clinical data were obtained from the department of oncology, respiratory and digestion, Drum Tower Hospital, Nanjing, China, during the period from June 2005 to December 2006. Malignant effusions were obtained from forty-six patients who have been histological or cytological diagnosis as stage IV malignant disease. Nine gastric cancer patients have received chemotherapy based on a semi-monthly regimen of 5-FU (5-fluorouracil), leucovorin and oxaliplatin before the appearance of effusions. Clinical characteristics of the patients are summarized in Table 1. In all specimens included in this study, cancer cells comprised at least 50% of the entire cells population based on cytology smears performed by the experienced pathologist. Informed consent was obtained from all patients and the protocols for this study were approved by the Human Research Protective Committee of our hospital.
Table 1

Demographic and clinical parameters of patients (n = 46)

 

Patients

Characteristics

No.

%

Age, years

  

   Median

63

   Range

38–87

Sex

  

   Female

21

46

   Male

25

54

Stage IV

46

100

ECOG performance status

  

   0–2

46

100

Primary Tumor

  

   NSCLC

20

43

   Gastric

21

46

   Gynecological

5

11

Sample type

  

   Pleural effusions

21

46

   Peritoneal effusions

25

54

Pre-Chemotherapy

  

   Yes

9

20

   No

37

80

Abbreviation: ECOG, Eastern Cooperative Oncology Group.

Sample collection and processing

All patients received catheter placement using an indwelling 16 G single lumen central venous catheter (CVC) (Arrow™ 16 G CVC set Catheter, Arrow, USA). Effusions were collected in sterile drainage bag with heparin (10,000 U/L effusions) added previously, submitted to our laboratory within minutes and were processed immediately. Samples were centrifuged at 1000 g for 10 minute to collect cells. After Ficoll-Hypaque (specific gravity 1.077, Pharmacia) density centrifugation, the interface layer was collected. The quality and viability of the cell suspension were assessed by trypan blue dye exclusion and cytological examination. Cells were counted, washed and centrifuged for later ATP-TCA assay and RNA extraction.

RNA isolation and cDNA synthesis

Total cell RNA was extracted using Trizol Reagent (Invitrogen, CA, USA) following the manufacture's protocol. cDNA was generated using Exscript™ RT reagent Kit (TaKaRa) according to manufacture's protocol.

Real time PCR quantification

Quantitation of the genes of interest and an internal reference gene (β-actin) was done using a fluorescence based real-time detection method (Mx3000P Real Time PCR System, Stratagene). Briefly, 2 μl of cDNA were used for each RT reaction. The 20 μl PCR reaction mixture contained 1× primers & probe mixture (Applied Biosystems, Foster city, CA. Assay IDs: Hs00157415_m1 (ERCC1); Hs00173233_m1 (BRCA1); Hs99999903_m1(β-actin)), 1× Absolute QPCR Mix (ABgene, Surrey, UK). The PCR conditions were 50°C for 2 min, 95°C for 15 min, followed by 45 cycles at 95°C for 15 s and 60°C for 1 min. Each sample was assayed in triplicate with commercial RNA as positive and RNase-free water as negative control.

Relative gene expression quantifications were calculated according to the comparative Ct method using β-actin as an endogenous control and commercial RNA (Clontech) control as calibrators on each plate. Final results were determined by the formula 2-ΔΔCt[17] and were analyzed with the Stratagene analysis software.

Evaluation of sensitivity to anti-cancer drugs using ATP-TCA

The chemosensitivity test was performed with primary tumor cells from malignant effusions as described before [20]. Briefly, assays were performed in 96-well polypropylene microplates(Corning-Costar 3790, NY, USA). Test drug concentrations were administrated in triplicate in six different concentrations: 0.234, 0.475, 0.95, 1.9, 3.8, and 7.6 μg·ml-1 cisplatin (QiLu Pharma. Co., China) or 0.288, 0.575, 1.15, 2.3, 4.6, and 9.2 μg·ml-1 docetaxel (Hengrui Pharma. Co., China). Subsequently, 100 μl of single cell suspension (2×105 /ml) in serum-free medium (CAM; DCS, Innovative Diagnostic Systeme, Hamberg, Germany) were added to each well. Two rows of the plate were reserved for controls, negative control (no drug, MO) and positive control (maximum ATP inhibitor, MI). After 6 days incubation at 37°C and 95% humidity in 5% CO2 atmosphere, intracellular ATP was extracted using the CellTiter-GIo Luminescent Kit (Promega, USA) according to the manufacturer's instructions and measured by microplate luminometer (Berthod Diagnostic system, Germany). A sensitivity index ranging from 0 to 600 for each drug was calculated by summing up the percentage of cell viability at the six drug concentrations tested [21]. Thus, a sensitivity index of 0 indicates maximal drug sensitivity, whereas a sensitivity index of 600 reflects minimal drug sensitivity.

Statistics

Spearman correlation coefficient was adopted to analysis the correlation between gene expression levels and drug sensitivity. ANOVA was used to evaluate the interaction of ERCC1 and BRCA1 on sensitivity to cisplatin. All values were based on two tailed statistical analysis. P value < 0.05 was considered statistically significant. Statistical analyses were done using SPSS 13.0 (SPSS Inc, Chicago, Illinois, USA).

Results

ATP-TCA

To determine the sensitivity to these drugs, primary tumor cells were isolated from malignant effusions and their chemosensitivity to cisplatin and docetaxel were assessed using the ATP-TCA assay. The serum free medium and polypropylene 96-well "U" microplates can enrich tumor cells up to 80–90%, reducing potential interference of non-tumor cells [20, 22]. And we have also proved the raise of tumor cells number by the end of 6-days culture in our preliminary test. Due to the strict sterile operation, sample processing and only the specimens containing at least 50% cancer cells enrolling, assays were successfully performed on all samples. Table 2 summarized the result of ATP-TCA on different subsets.
Table 2

In vitro chemosensitivity assay results

Cytotoxic drug

Total

NSCLC

Gastric

Gynecological

 

Sensitivity Index of Median (range), No. patients

Docetaxel

455 (206–600), 46

422 (206–566), 20

513 (382–600), 21

364 (206–438), 5

Cisplatin

442 (184–600), 46

445 (184–558), 20

455 (273–600), 21

387 (301–464), 5

ERCC1 expression and cisplatin chemosensitivity

Except one specimen from NSCLC patients, ERCC1 were amplified in all other samples. The median ERCC1 mRNA expression was 0.057 (range: 0.005–0.831, n = 45). Figure 1 shows a significant correlation between ERCC1 mRNA expression and sensitivity to cisplatin in malignant pleural effusions of NSCLC patients (P = 0.001, r = 0.685). Patients with lower ERCC1 mRNA expression levels had a higher sensitivity to cisplatin compared with those with higher expression levels. However in gastric group, we did not find a significant association between ERCC1 mRNA expression and cisplatin chemosensitivity (P = 0.482, r = 0.162). Considering ERCC1 expression is up-regulated in response to cisplatin exposure [23] and 9 patients have been treated with oxaliplatin before, we deduced that previous exposure to platinum might induce alterations on ERCC1 gene expression, which could be different according to individual patient. When nine pre-treated patients were excluded from this group, a significantly correlation between the level of ERCC1 and chemosensitivity to cisplatin was found in untreated gastric patients (P = 0.014, r = 0.685; Figure 2).
Figure 1
Figure 1

A sensitivity index of 0 indicates maximal drug sensitivity, whereas a sensitivity index of 600 reflects minimal drug sensitivity. Relative ERCC1 mRNA expression (logarithmically transformed) was positively correlated with resistance to cisplatin in 19 NSCLC patients (P = 0.001, r = 0.685).

Figure 2
Figure 2

ERCC1 mRNA expression levels were significant association with sensitivity to cisplatin in 12 untreated gastric cancer patients (P = 0.014, r = 0.685).

BRCA1 expression and cisplatin chemosensitivity

We next analyzed the correlation between BRCA1 mRNA expression and cisplatin chemosensitivity in malignant effusions. BRCA1 mRNA expression was detectable by quantitative RT-PCR in all samples. The median level was 2.209×10-3 (range, 0.019–188.645×10-3, n = 46). As shown in Figure 3 and 4, BRCA1 mRNA expression levels were inversely correlated with sensitivity to cisplatin in malignant pleural effusions of NSCLC patients (P = 0.014, r = 0.541; Figure 3) and in ascites of gastric patients (P = 0.002, r = 0.624; Figure 4).
Figure 3
Figure 3

Relative BRCA1 mRNA expression levels (logarithmically transformed) were positively correlated with resistance to cisplatin in 20 NSCLC patients (P = 0.014, r = 0.541).

Figure 4
Figure 4

Relationship between BRCA1 and sensitivity to cisplatin in 21 gastric cancer patients (P = 0.002, r = 0.624).

BRCA1 expression and docetaxel chemosensitivity

On the opposite site of its prediction value for cisplatin sensitivity, BRCA1 mRNA expression levels in malignant effusions were positively correlated with sensitivity to docetaxel, in which patients with higher BRCA1 mRNA expression levels had a higher sensitivity to docetaxel compared with those with lower expression levels (NSCLC: P = 0.008, r = -0.573, Figure 5; gastric: P = 0.032, r = -0.468; Figure 6). We further noticed that the correlation between BRCA1 mRNA expression and docetaxel chemosensitivity in gastric group was due to the two extreme points, and that a higher number of samples would be necessary to confirm it.
Figure 5
Figure 5

BRCA1 mRNA expression levels (logarithmically transformed) were negatively correlated with resistance to docetaxel in 20 NSCLC patients (P = 0.008, r = -0.573).

Figure 6
Figure 6

Relationship between BRCA1 mRNA expression and sensitivity to docetaxel in 21 gastric cancer patients (P = 0.032, r = -0.468).

Combination of two genes and sensitivity to cisplatin

As both ERCC1 and BRCA1 were correlated with cisplatin chemosensitivity, we further investigated the effect of combination of them on the sensitivity to cisplatin. A significant interaction was found between BRCA1 and ERCC1 gene expression on the sensitivity to cisplatin in total group (P = 0.010, n = 45) and gastric group (P = 0.027, n = 21). When both ERCC1 and BRCA1 were lowly expressed, the sensitivity to cisplatin was improved and which was higher than the sum of the degrees when only single marker was lowly expressed. This could be explained as combination of low expression levels of ERCC1 and BRCA1 correlated with more sensitivity to cisplatin than single marker being considered. Similar trend was also found in NSCLC group without statistical significance (P = 0.12, n = 19).

Discussion

The primary purpose of this study was to determine the correlation between ERCC1 and BRCA1 mRNA expression and sensitivity to cisplatin and/or docetaxel in special metastases, malignant effusions. We use body cavity as a specific metastatic site in current study based on following reasons. Firstly, tumor cells in malignant effusions have distinct characteristics such as loss of interaction with stromal and endothelial cells, reduced availability of oxygen and nutrients [24]. Secondly, it is easy, non-invasive and repeatable to obtain effusion samples from inoperable lung or gastric cancer patients with malignant effusions [25]. Finally, malignant effusion is a complication of various advanced malignant disease. Approximately half of all patients with metastatic cancer develop a malignant effusion at the course of disease [26].

ATP-TCA, a well established in vitro assay, has been demonstrated as a valuable tool for the evaluation of chemosensitivity in solid tumors, as well as been shown to allow a prediction of clinical results [21, 27]. In the present study, ATP-TCA was performed to evaluate the single agent chemosensitivity in a consecutive series of 46 malignant effusions. By using the in vitro assay, we excluded the interference from other systematic therapy such as combination of other drugs and potential prognostic effects in vivo, thus making the assessment between particular gene expression and a given drug more precise. However, chemosensitivity results from an in vitro study can not be directly translated into clinical practice because the chemoresponse does not depend on intrinsic chemosensitivity alone. Our future study will focus on the confirmation of the relationship between these two genes expression in malignant effusions and patients' clinical response in clinical trial.

We observed a clear correlation between ERCC1 and BRCA1 mRNA expression level and chemosensitivity to cisplatin, one of the most widely used agent in both NSCLC and gastric cancer. Both ERCC1 and BRCA1 were negatively correlated with cisplatin sensitivity in pleural effusions of NSCLC patient. In addition, BRCA1 mRNA expression was negatively correlated with cisplatin sensitivity in peritoneal effusions of gastric cancer patients, while ERCC1 was correlated with cisplatin sensitivity only in specimens of untreated gastric patients. Unlike ERCC1, BRCA1 is involved in both homologous recombination and nonhomologous end joining of double-stranded DNA breaks and also in NER of DNA adducts [15, 16]. It is reasonable to speculate that the different mechanisms of these two genes on DNA repair might be a possible explanation for this disparity.

In comparison to the evidence linking ERCC1 to cisplatin sensitivity, the link between BRCA1 and response to taxane remains to be documented. We demonstrated a positively correlation between BRCA1 mRNA expression and docetaxel sensitivity in malignant effusions in both NSCLC and gastric patients. Our study showed that patients with higher BRCA1 level in malignant effusions are more sensitive to docetaxel than those with lower level. This finding is in line with the previous reports [18, 19]. Knockdown of BRCA1 gene induce a 50-fold increase in resistance to paclitaxel agents [18]. A recently study show that absence of BRCA1 expression is a predictor of shorter TTP (time to progression) in advanced breast cancer patients treated with taxane-based therapy [19]. Collectively, our findings supported the hypothesis that BRCA1 and ERCC1 mRNA expression levels were correlated with sensitivity to docetaxel and/or cisplatin in metastatic effusions, which is in consistent with previous findings based on primary tumor.

Our second aim was to study whether the combination of ERCC1 and BRCA1 could do better on predicting the chemosensitivity to cisplatin. We observed the significant interaction of BRCA1 and ERCC1 mRNA expression levels on sensitivity to cisplatin in total and gastric cancer patients. However, we did not obtain the same conclusion in lung cancer patients. This might due to the small sample size and over-dispersion data, which would restrict the statistical power to identify interaction effect in that panel. According to our results, the combination of two biomarkers, ERCC1 and BRCA1, may play a better role in predicting the cisplatin chemosensitivity than the single one being considered.

Conclusion

In summary, our data demonstrated for the first time that ERCC1 and BRCA1 mRNA expression levels were correlated with cisplatin and/or docetaxel in the ex vivo study of malignant effusions. Combination of ERCC1 and BRCA1 mRNA expression may have an interaction prediction on the sensitivity to cisplatin.

Declarations

Acknowledgements

This work was supported by the China National Natural Science Foundation (30471701) and the Foundation of Nanjing Municipal Health Bureau (ZKX06021).

Authors’ Affiliations

(1)
Department of Oncology, Drum Tower Hospital Affiliated to Medical School of Nanjing University & Clinical Cancer Institute of Nanjing University, Nanjing, China
(2)
Department of Epidemiology and Biostatistics, Epidemiology and Biostatistics Graduate Program, Data Analysis Center, School of Public Health, Nanjing Medical University, Nanjing, China

References

  1. Rosell R, Cobo M, Isla D, Sanchez JM, Taron M, Altavilla G, Santarpia M, Moran T, Catot S, Etxaniz O: Application of genomics in NSCLC. Lung Cancer. 2005, S33-40. 10.1016/S0169-5002(05)81571-5. Suppl 2Google Scholar
  2. Lee W, Lockhart AC, Kim RB, Rothenberg ML: Cancer pharmacogenomics: powerful tools in cancer chemotherapy and drug development. Oncologist. 2005, 10: 104-11. 10.1634/theoncologist.10-2-104.View ArticlePubMedGoogle Scholar
  3. Mehlen P, Puisieux A: Metastasis: a question of life or death. Nature Rev Cancer. 2006, 6 (6): 449-58. 10.1038/nrc1886.View ArticleGoogle Scholar
  4. Christofori G: New signals from the invasive front. Nature. 2006, 441: 444-50. 10.1038/nature04872.View ArticlePubMedGoogle Scholar
  5. Stevens EV, Raffeld M, Espina V, Kristensen GB, Trope' CG, Kohn EC, Davidson B: Expression of xeroderma pigmentosum a protein predicts improved outcome in metastatic ovarian carcinoma. Cancer. 2005, 103 (11): 2313-19. 10.1002/cncr.21031.View ArticlePubMedGoogle Scholar
  6. Aschele C, Debernardis D, Tunesi G, Maley F, Sobrero A: Thymidylate synthase protein expression in primary colorectal cancer compared with the corresponding distant metastases and relationship with the clinical response to 5-fluorouracil. Clin Cancer Res. 2000, 6: 4797-4802.PubMedGoogle Scholar
  7. Westra JL, Hollema H, Schaapveld M, Platteel I, Oien KA, Keith WN, Mauritz R, Peters GJ, Buys CH, Hofstra RM, Plukker JT: Predictive value of thymidylate synthase and dihydropyrimidine dehydrogenase protein expression on survival in adjuvantly treated stage III colon cancer patients. Ann Oncology. 2005, 16 (10): 1646-1653. 10.1093/annonc/mdi316.View ArticleGoogle Scholar
  8. Lenz HJ, Leichman CG, Danenberg KD, Danenberg PV, Groschen S, Cohen H, Crookes P, Silberman H, Baranda J, Garcia Y, Li J, Leichman L: Thymidylate synthase mRNA level in adenocarcinoma of the stomach: a predictor for primary tumour response and overall survival. J Clin Oncol. 1996, 14: 176-82.PubMedGoogle Scholar
  9. Vogel U, Dybdahl M, Frentz G, Nexo BA: DNA repair capacity: inconsistency between effect of over-expression of five NER genes and the correlation to mRNA levels in primary lymphocytes. Mutat Res. 2000, 461: 197-210.View ArticlePubMedGoogle Scholar
  10. Kwon HC, Roh M, Oh S, Kim SH, Kim M, Kim JS, Kim HJ: Prognostic value of expression of ERCC1, thymidylate synthase, and glutathione S-transferase P1 for 5-fluorouracil/oxaliplatin chemotherapy in advanced gastric cancer. Ann Oncol. 2007, 18: 504-9. 10.1093/annonc/mdl430.View ArticlePubMedGoogle Scholar
  11. Olaussen KA, Dunant A, Fouret P, Brambilla E, Andre F, Haddad V, Taranchon E, Filipits M, Pirker R, Popper HH, Stahel R, Sabatier L, Pignon JP, Tursz T, Le Chevalier T, Soria JC, IALT Bio Investigators: DNA repair by ERCC1 in non-small cell lung cancer and cisplatin-based adjuvant chemotherapy. N Eng J Med. 2006, 335 (10): 983-991. 10.1056/NEJMoa060570.View ArticleGoogle Scholar
  12. Park DJ, Lenz HJ: Determination of chemosensitivity in gastric cancer. Curr Opin Pharmacol. 2006, 6: 337-344. 10.1016/j.coph.2006.05.002.View ArticlePubMedGoogle Scholar
  13. Quinn JE, Kennedy RD, Mullan PB, Gilmore PM, Carty M, Johnston PG, Harkin DP: BRCA1 functions as a differential modulator of chemotherapy-induced apoptosis. Cancer Res. 2003, 63: 6221-8.PubMedGoogle Scholar
  14. Rosell R, Cecere F, Santarpia M, Reguart N, Taron M: Predicting the outcome of chemotherapy for lung cancer. Curr Opin Pharmacol. 2006, 6: 323-331. 10.1016/j.coph.2006.01.011.View ArticlePubMedGoogle Scholar
  15. Mullan PB, Quinn JE, Harkin DP: The role of BRCA1 in transcriptional regulation and cell cycle control. Oncogene. 2006, 25: 5854-63. 10.1038/sj.onc.1209872.View ArticlePubMedGoogle Scholar
  16. Kennedy RD, Quinn JE, Mullan PB, Johnston PG, Harkin DP: The role of BRCA1 in the cellular response to chemotherapy. J Nat Cancer Inst. 2004, 96: 1659-68.View ArticlePubMedGoogle Scholar
  17. Taron M, Rosell R, Felip E, Mendez P, Souglakos J, Ronco MS, Queralt C, Majo J, Sanchez JM, Sanchez JJ, Maestre J: BRCA1 mRNA expression levels as an indicator of chemoresistance in lung cancer. Hum Mol Genet. 2004, 13: 2443-9. 10.1093/hmg/ddh260.View ArticlePubMedGoogle Scholar
  18. Kennedy RD, Quinn JE, Johnston PG, Harkin DP: BRCA1: mechanisms of inactivation and implications for management of patients. Lancet. 2002, 360: 1007-14. 10.1016/S0140-6736(02)11087-7.View ArticlePubMedGoogle Scholar
  19. Kurebayashi J, Yamamoto Y, Kurosumi M, Okubo S, Nomura T, Tanaka K, Sonoo H: Loss of BRCA1 expression may predict shorter time-to-progression in metastatic breast cancer patients treated with taxanes. Anticancer Res. 2006, 26: 695-702.PubMedGoogle Scholar
  20. Andreotti PE, Cree IA, Kurbacher CM, Hartmann DM, Linder D, Harel G, Gleiberman I, Caruso PA, Ricks SH, Untch M: Chemosensitivity testing of human tumors using a microplate adenosine triphosphate luminescence assay: clinical correlation for cisplatin resistance of ovarian carcinoma. Cancer Res. 1995, 55: 5276-82.PubMedGoogle Scholar
  21. Ugurel S, Schadendorf D, Pfohler C, Neuber K, Thoelke A, Ulrich J, Hauschild A, Spieth K, Kaatz M, Rittgen W, Delorme S, Tilgen W, Reinhold U, Dermatologic Cooperative Oncology Group: In vitro drug sensitivity predicts response and survival after individualized sensitivity-directed chemotherapy in metastatic melanoma: a multicenter phase II trial of the dermatologic cooperative oncology group. Clin Cancer Res. 2006, 12: 5454-63. 10.1158/1078-0432.CCR-05-2763.View ArticlePubMedGoogle Scholar
  22. Di Nicolantonio F, Mercer SJ, Knight LA, Gabriel FG, Whitehouse PA, Sharma S, Fernando A, Glaysher S, Di Palma S, Johnson P, Somers SS, Toh S, Higgins B, amont A, Gulliford T, Hurren J, Yiangou C, Cree IA: Cancer cell adaptation to chemotherapy. BMC Cancer. 2005, 5: 78-10.1186/1471-2407-5-78.View ArticlePubMedPubMed CentralGoogle Scholar
  23. Li Q, Gardner K, Zhang L, Tsang B, Bostick-Bruton F, Reed E: Cisplatin induction of ERCC-1 mRNA expression in A2780/CP70 human cancer cells. J Bio Chem. 1998, 273 (36): 23419-23425. 10.1074/jbc.273.36.23419.View ArticleGoogle Scholar
  24. Konstantinovsky S, Nielsen S, Vyberg M, Kvalheim G, Nesland JM, Reich R, Davidson B: Angiogenic molecule expression is downregulated in effusions from breast cancer patients. Breast Cancer Res Treat. 2005, 94: 71-80. 10.1007/s10549-005-7328-3.View ArticlePubMedGoogle Scholar
  25. Kimura H, Fujiwara Y, Sone T, Kunitoh H, Tamura T, Kasahara K, Nishio K: EGFR mutation status in tumor-derived DNA from pleural effusion fluid is a practical basis for predicting the response to gefitinib. Br J Cancer. 2006, 95: 1390-5. 10.1038/sj.bjc.6603428.View ArticlePubMedPubMed CentralGoogle Scholar
  26. Neragi-Miandoab S: Malignant pleural effusion. Current and evolving approaches for its diagnosis and management. Lung cancer. 2006, 54: 1-9. 10.1016/j.lungcan.2006.04.016.View ArticlePubMedGoogle Scholar
  27. Schmidt M, Bremer E, Hasenclever D, Victor A, Gehrmann M, Steiner E, Schiffer IB, Gebhardt S, Lehr HA, Mahlke M, Hermes M, Mustea A, Tanner B, Koelbl H, Pilch H, Hengstler JG: Role of the progesterone receptor for paclitaxel resistance in primary breast cancer. Br J Cancer. 2007, 96: 241-7. 10.1038/sj.bjc.6603538.View ArticlePubMedPubMed CentralGoogle Scholar

    28. Pre-publication history

    1. The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2407/8/97/prepub

Copyright

© Wang et al; licensee BioMed Central Ltd. 2008

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Advertisement

BMC Cancer

ISSN: 1471-2407

Contact us