Open Access

Cisplatin plus vinorelbine as induction treatment in stage IIIA non‑small cell lung cancer

  • Authors:
    • Magda Palka
    • Antonio Sanchez
    • Mar Córdoba
    • Gema Díaz Nuevo
    • Andrés Varela De Ugarte
    • Blanca Cantos
    • Miriam Méndez
    • Virginia Calvo
    • Constanza Maximiano
    • Mariano Provencio
  • View Affiliations

  • Published online on: January 18, 2017     https://doi.org/10.3892/ol.2017.5620
  • Pages: 1647-1654
  • Copyright: © Palka et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Survival rates in patients with stage IIIA non-small cell lung cancer (NSCLC) remain low despite curative treatment. This is due to tumor recurrence at distant sites. The aim of neoadjuvant chemotherapy (NA‑CT) is to eradicate occult micrometastatic disease and improve survival in patients that are not candidates for surgery following induction therapy. A total of 21 patients with ipsilateral mediastinal node involvement (N2) with potentially resectable disease, who had been diagnosed with stage IIIA (T1‑3 N1‑2 and T4N0) NSCLC and who had received cisplatin and vinorelbine as induction treatment were included in this retrospective study. Patients who responded to the treatment underwent surgery, and those who were unresponsive received radical radiotherapy. Follow‑up was conducted between March 2008 and April 2014. The median age of patients was 61 years, and all patients exhibited a good Eastern Cooperative Oncology Group performance status. The majority of patients were histologically diagnosed with adenocarcinoma (48%) or squamous cell carcinoma (38%), which was a poor prognostic factor for overall survival (OS). A total of 7 patients underwent surgery (of which 6 were down‑staged), with a 3‑year survival rate of 42.8%. The most significant factor associated with response to induction treatment was multistation nodal involvement. The complete resection rate for surgical patients was 85.7%. Unresectable patients had a 3‑year survival rate of 25.8%. OS time for the whole cohort was 28.5 months, and the 3‑ and 5‑year OS rates were 28.5% and 4.7%, respectively. CT‑induced toxicity did not affect any treatment regime or surgical procedures. In conclusion, the use of cisplatin plus vinorelbine is feasible in a neoadjuvant setting, with good response rates and acceptable toxicity. Multistation N2 involvement is the main prognostic factor for a poor response to induction treatment.

Introduction

Non-small cell lung cancer (NSCLC) accounts for ~80% of all lung cancers. Surgery remains the main treatment for early-stage NSCLC patients (1). Operable patients with stage IA-IIIA disease (2) are candidates for resection surgery with curative intent; this group accounts for ~35% of all lung cancer cases. However, in a large number of patients, tumors recur following surgical resection (3). Five-year survival rates are variable, at 57–67% and 39–55% for stage I and II disease, respectively (3). Patients with completely resected stage IIIA disease exhibit a 5-year overall survival (OS) rate of ~25%. The most frequent cause of mortality in these patients is distant metastases (4,5). Occult micrometastatic disease, which remains undetected at the time of presurgical staging, may be the cause of recurrence in distant sites following surgery. Therefore, eradicating early metastatic disease using chemotherapy (CT) may reduce the incidence of recurrence at distant sites, subsequently improving survival (6). CT may be administrated prior to [induction or neoadjuvant CT (NA-CT)] or subsequent to (adjuvant CT) surgery.

At present, NA-CT is the standard treatment for stage IIIA NSCLC. It is known to improve survival in patients who are not candidates for surgery following induction CT; however, response and survival rates remain low (7).

Theoretical advantages of induction CT include in vivo evaluation of response to CT, which may identify patients that would benefit from adjuvant treatment; early micrometastatic treatment, which may prevent disease recurrence at distant sites; reduced drug resistance due to early CT exposure; and increased resectability and conservation of healthy pulmonary parenchyma (6).

However, identification of patients that may benefit from surgery following induction CT is controversial. A previous by the Southwestern Oncology Group (8) indicated that surgery should be avoided in cases where mediastinal involvement persists subsequent to NA-CT. In this previous study, patients with complete pathological response exhibited a median survival time of 30 months compared to 10 months in patients with residual tumor.

Novel chemotherapeutic drugs that have demonstrated efficacy in the treatment of metastatic disease, including gemcitabine (9), paclitaxel (10), vinorelbine (9) and docetaxel (11), have been added to neoadjuvant treatment regimens, with response rates of 44–80%, and complete resection rates of 67–79%. The aforementioned drugs are also strong radiosensitizing agents.

In the current study, the effect of NA-CT treatment with cisplatin plus vinorelbine on OS was analyzed in 21 N2 patients diagnosed with potentially resectable NSCLC.

Patients and methods

Patient cohort

A total of 21 patients were included and retrospectively analyzed, meeting the following inclusion criteria: Adults over 18 years, histologically diagnosed with stage IIIA (T1-3 N1-2 and T4N0) NSCLC between March 2008 and December 2011. Patients required available tissue remaining from biopsy for analysis, had to have been treated with cisplatin and vinorelbine NA-CT and were followed up at the Puerta de Hierro Hospital (Madrid, Spain). All patients were followed up until April 2014. The study adhered to the principles of the Declaration of Helsinki and Good Clinical Practice guidelines (12), and was approved by the institutional review board of Puerta de Hierro Hospital.

The clinical records of the patient cohort were reviewed; this included the patient medical history and results of physical examination, basic biochemical blood tests, blood count, blood clotting tests, chest X-rays and biopsies, with a diagnosis of NSCLC in all cases.

Patients underwent initial positron emission tomography (PET)/computed tomography, as well as pathological assessment of mediastinal nodes by biopsy or cytology. Staging was determined according to the 7th edition of TNM Classification of Malignant Tumours (13).

All cases were submitted to the thoracic tumor committee, which includes radiation oncologists, pulmonologists, thoracic surgeons, radiologists, nuclear medicine physicians, pathologists and medical oncologists, where the neoadjuvant treatment approach was selected.

All patients received three 21-day cycles of induction treatment with 75 mg/m2 intravenous cisplatin (day 1) and 25 mg/m2 vinorelbine (days 1 and 8).

Treatment response was assessed by PET/computed tomography; if a response was observed, mediastinal node involvement was re-evaluated. Cases that had been down-staged and were suitable for surgery subsequently underwent lobectomy or bilobectomy.

The following patient characteristics were evaluated: Gender, smoking history, age at diagnosis, comorbidities (including hypertension, chronic obstructive pulmonary disease, heart disease, diabetes mellitus, transplant and coagulopathy), personal history of cancer, Eastern Cooperative Oncology Group performance status (ECOG PS) (14), tumor histology, and tumor stage at diagnosis. Data relating to induction treatment response and disease evolution were also recorded.

Progression-free survival (PFS) was defined as the time between diagnosis date and the date when the first recurrence or progression was identified, and OS time was defined as the period between diagnosis of lung cancer and patient mortality.

Statistical analysis

Qualitative variables were expressed as absolute frequency and percentage. Normal distributions were tested using the Shapiro-Wilk test. Mean comparisons between groups of continuous variables with normal distribution were compared using the Student's t-test for unpaired samples, while those with an asymmetric distribution were compared using the Mann-Whitney U test. The χ2 test and Fisher's exact test were used to analyze qualitative variables. A hazard ratio (HR) and 95% confidence interval (95% CI) were estimated for each variable. P-values were two-sided, and P<0.05 was considered to indicate a statistically significant difference. SPSS 14.0 software (SPSS, Inc., Chicago, IL, USA) was used for all statistical analyses.

Results

Patient characteristics

The general characteristics of the patients at diagnosis and patient response to NA-CT are shown in Table I. All patients exhibited an ECOG PS of 0 or 1, the mean age of patients was 62.57 years (range, 45–73 years) and 62% of patients exhibited >2 relevant comorbidities. All patients exhibited stage IIIA NSCLC at diagnosis, and 14 patients exhibited N2, multistation, or bulky mediastinal node involvement. Bulky disease was defined as mediastinal lymph nodes measuring >2 cm at the longest axis. No cases of CT-induced toxicity resulting in treatment delay occurred.

Table I.

Clinicopathological characteristics of 21 stage IIIA non-small cell lung cancer patients.

Table I.

Clinicopathological characteristics of 21 stage IIIA non-small cell lung cancer patients.

ParameterPatients
Median age at diagnosis, years62.57
Gender, n (%)
  Female  4 (19)
  Male17 (81)
Age, years
  Mean62.57
  Range45–73
Smoking history, n (%)
  Non-smokers  3 (15)
  Smokers18 (85)
ECOG PS, n (%)
  016 (76)
  1  5 (24)
Comorbidities, n (%)
  0–1  8 (38)
  2–3  9 (43)
  >3  4 (19)
Histology, n (%)
  Adenocarcinoma10 (48)
  Squamous cell carcinoma  8 (38)
  Large cell carcinoma  3 (14)
TNM stage, n (%)
  T1-3, N0-11 (5)
  T1-3, N217 (81)
  T4N0  3 (14)
Bulky or multistation node involvement, n (%)
  Yes14 (67)
  No  7 (33)
Response to NA-CT, n (%)
  Complete  4 (19)
  Partial  6 (29)
  Stable  9 (43)
  Progression2 (9)
Down-staged, n (%)
  Yes  7 (33)
  No14 (67)
Surgical treatment, n (%)
  Yes  7 (33)
  No14 (67)

[i] ECOG PS, Eastern Cooperative Oncology Group performance status; NA-CT, neoadjuvant chemotherapy. T, tumor; N, node; M, metastasis.

Patient response to NA-CT

A total of 10 patients (48%) exhibited response to induction treatment; a total of 4 patients (19%) exhibited a complete response and 6 patients (29%) exhibited a partial response according to the Response Evaluation Criteria In Solid Tumors criteria (15). However, pathological down-staging was only verified in 7 cases (33%). A total of 9 patients exhibited a stable response, and 2 progressed following NA-CT. The characteristics of the patients that were successfully down-staged following induction treatment are shown in Table II.

Table II.

Comparison of patient characteristics of down-staged (n=7) and non-down-staged patients (n=14).

Table II.

Comparison of patient characteristics of down-staged (n=7) and non-down-staged patients (n=14).

A, Clinicopathological parameters of patients.

ParameterDown-staged patientsNon-down-staged patients
Median age (range), years62 (50–70)61 (45–73)
Gender, n
  Female1  3
  Male611
ECOG PS, n
  0610
  11  4
Smoking history, n
  Smoker611
  Non-Smoker0  3
  Unknown1  0
Histology, n
  Adenocarcinoma4  6
  Squamous cell carcinoma1  7
  Large cell carcinoma2  1
Multistation/bulky mediastinal node involvement, n
  Yes410
  No3  4

B, TNM stages of patients pre- and post-chemotherapy

TNM stage

PatientspreNA-CTpostNA-CT

Down-staged patientsT1N2T0N0
T2N2T0N0
T2N2T0N0
T3N2T0N0
T3N2yT3N0
T1N2yT2N0
T3N1yT2N0
Non-down-staged patientsT2N2T2N2
T3N2T3N2
T2N2T2N2
T4N0T4N0
T3N2T3N2
T2N2T2N2
T3N2T3N2
T2N2T2N2
T4N0T4N0
T2N2T2N2
T2N2T2N2
T4N0T4N0
T2N2T2N2M1
T3N2T3N2

[i] ECOG PS, Eastern Cooperative Oncology Group performance status; NA-CT, neoadjuvant chemotherapy; T, tumor; N, node; M, metastasis.

Univariate analysis revealed a significant association between multistation or bulky nodal involvement and response to induction CT. This association indicated that the response to NA-CT was worse in patients who exhibited this type of nodal involvement, with an odds ratio of 15 (95% CI, 1.34–167.63; P=0.0446) (Table III). However, no significant difference was identified between response to NA-CT and other clinicopathological factors, such as gender, smoking history, ECOG PS, histology, primary lesion size and nodal involvement.

Table III.

Response to chemotherapy and presence of multistation or bulky lymph node involvement in non-small cell lung cancer patients.

Table III.

Response to chemotherapy and presence of multistation or bulky lymph node involvement in non-small cell lung cancer patients.

Response to neoadjuvant chemotherapyPatients, n (%a)Patients with multistation/bulky involvement, n (%b)
Complete  4 (19)1 (25)
Partial  6 (29)3 (50)
Stable  9 (43)8 (89)
Progression2 (9)  2 (100)

a % of total

b % of subgroup. Odds ratio, 15; 95% confidence interval, 1.3–167.6; P=0.0446.

Treatment following induction CT

A total of 7 (33%) patients underwent surgery (lobectomy): 3 of the 4 patients who had exhibited a complete response, and 4 out of 6 who had exhibited a partial response. Of the 7 patients that underwent surgery, 6 underwent complete resection (defined as tumor-free surgical margins and superior mediastinal nodes in the surgical specimen with no infiltration of tumor cells). The surgery-associated mortality rate was 0%, as no patient mortalities occurred within the first 30 days following surgery. Patients who had shown no response to NA-CT were treated with radical radiotherapy at doses of ≤66 Gy (dose range from 45–66 Gy administered in a daily schedule at a fraction of 1.8 cGy per day).

Follow-up

The median OS time in the cohort was 28.5 months (range, 9–62 months), and the 3- and 5-year OS rates were 28.5 and 4.7%, respectively. By the end of follow up in April 2014, 13/21 patients included in the study had died, 92.3% of whom had succumbed due to tumor progression. Figs. 1 and 2 show the PFS and OS of the patient cohort, respectively. The 3-year survival rate of the patients that underwent surgery was 42.8%, compared to 28.5% in non-surgical patients. For the patients who remained alive upon completion of the study, the follow-up period was 40 months.

Overall, the whole cohort exhibited a 3-year disease-free survival rate of 23.8%, and a 5-year disease-free survival rate of 4.7%. The median PFS time was 19.4 months (range, 6–62 months), and 76% of patients exhibited tumor recurrence.

In the group of patients who were successfully down-staged, 4/7 (57.1%) patients exhibited recurrence, with a PFS time of 18 months (range, 3–58 months). Among the non-down-staged patients, 12 (85%) exhibited recurrence, with a PFS time of 14 months (range, 6–55 months).

Patients who underwent surgery exhibited a median PFS time of 10 months (range, 3–18 months) and 5 (71%) patients exhibited recurrence. No significant differences between any of the clinicopathological patient characteristics analyzed and PFS were identified.

Of the down-staged patient group, 4 (57%) patients died, with an OS time of 58 months (range, 19–62 months). In the non-down-staged group, 9/14 patients died (64.2%) with a median OS time of 27 months (range, 8–58 months).

A significant association between tumor histology and OS was identified; squamous cell carcinoma, which was diagnosed in 8 patients (of whom 7 had died by the end of the study), was associated with a shorter OS time (P=0.029).

No statistically significant differences were identified between OS and gender, smoking history, ECOG PS, tumor size, nodal involvement, multistation or bulky disease, down-staging or surgery.

A total of 12 (57%) patients exhibited distant metastasis at the end of the study. Distant metastasis to the lung (7 cases) and central nervous system (5 cases) occurred most frequently, whereas bone and mediastinal metastasis were less common.

Discussion

Patients with stage IIIA N2 NSCLC exhibit 5-year OS rates of 10–15%. In stage IIIA N2 patients with multistation or bulky disease this rate is only 2–5%. The efficacy of surgical treatment in these cases is controversial. In four previous studies, which included a total of 1,180 patients undergoing surgery, the 5-year OS rates ranged from 14 to 30% (1619). However, these studies used different inclusion criteria, included patients with different prognoses, defined ‘resectable disease’ or ‘marginally resectable tumor’ differently, and used varying CT regimens as induction or adjuvant treatment. Therefore, comparisons must be considered with caution. Despite these limitations, other studies suggest that treatment with cisplatin-based CT improves survival in NSCLC patients (7,2025).

Generally, patients treated with NA-CT exhibit a median survival time of 20 months and a 3-year survival rate of 34% (6,26). This is consistent with the results of the present study, in which OS was 28 months and PFS was 19.5 months.

Complete resection, down-staging and complete resection are predictors of long-term survival (27,28). There is a variability in recurrence free survival following radical treatment of stage III non-small cell lung cancer, and the above-mentioned factors may assist with the selection of patients who will show greater benefit from thoracic surgery. Patients who undergo tumor resection have longer survival times than those who do not (29,30).

Complete pathological response following NA-CT typically varies from 0 to 9.5% (20,24,28). Two previous studies reported rates of 16.7% (31) and 15% (32); however, this is rare. In the present study, the complete response rate was 19%. This was a notable results, although it did not correlate significantly with survival due to the small sample size. The type of response to neoadjuvant chemotherapy (complete, partial, stable or progressive disease) correlated with the presence r not of bulky or multistation mediastinal nodal involvement. In addition, the current study found a median OS time of 58 months in patients achieving pathological tumor response, which was significantly higher than that of patients with no response, who exhibited an OS time of 27 months.

Andre et al (33) analyzed a cohort of 702 patients with N2 NSCLC and identified four negative risk factors: clinical evidence of N2 prior to surgery, multistation mediastinal lymph node involvement, and pT3 or pT4 stage disease. Choi et al (34), found that, among the 19 clinical pathological prognostic factors studied in patients with pathological evidence of N2 NSCLC, incomplete resection and persistent N2 disease after induction CT were negative prognostic factors in univariate analysis. Clinical evidence of N2 disease, multistation mediastinal lymph node involvement and adenocarcinoma histology indicated a poorer prognosis; however, no statistical significance was identified. Furthermore, adjuvant CT administration did not significantly improve prognosis.

Univariate analysis indicated that complete resection and adjuvant CT were favorable prognostic factors in the present study in 6/7 patients who underwent surgery and complete resection. Complete resection is an established prognostic factor in several previous studies (27,28,34,35). In these previous studies, overall survival and progression free survival were increased in those patients who achieved complete resection. Adjuvant chemotherapy demonstrated an improvement in survival when compared with patients treated with surgery or radiotherapy only (4,20).

In the present study, squamous cell carcinoma was significantly associated with a shorter OS time and thus is considered a negative prognostic factor. Clinicopathological variables, including gender, smoking history, ECOG, primary tumor size, nodal involvement, multistation lymph nodes and bulky disease, were not statistically associated with OS.

Clinical trials specifically designed for patients with stage IIIA NSCLC are listed in Table IV; five of the studies included did not reach recruitment targets, mainly due to differences identified in the treatment arms. Only the Spanish Lung Cancer Group 9901 and the NCT0000262 trials were completed.

Table IV.

Previous clinical trials involving stage IIIA non-small cell lung cancer patients.

Table IV.

Previous clinical trials involving stage IIIA non-small cell lung cancer patients.

Trial (ref.)Recruitment period (years)Patients, nArms comparedNA-CT regimenAdjuvant chemotherapyAdjuvant RTRecruitment completedReason for study interruptionMedian follow-up (years)Median OS time (months)
MD Anderson 1994 (24)1987–1993  60NeoQT + Qx vs. Qx alone operative QTCyclophosphamide + etoposide + cisplatin; 3 cycles every 4 weeks3, to respondersaYes, if surgery incomplete or unresectableNoBenefit of preoperative chemotherapy6.764 for pre- vs. 11 for surgery alone
Spain 1994 (21)1989–1991  59NeoQT + Qx vs. Qx aloneMitomycin + ifosfamide + cisplatin; 3 cycles every 3 weeks0YesNoBenefit of preoperative chemotherapy6.326 for preoperative QT vs. 8 for surgery alone
JCOG 9209 2003 (38)1993–1998  62NeoQT + Qx. vs. Qx aloneVindesine + cisplatin; 3 cycles every 4 weeks0Yes, if surgery incompleteNoPoor accrual5.717 for preoperative QT vs. 16 for surgery alone group
China 2002 (39)1999–2004  55NeoQT + Qx vs. Qx aloneDocetaxel + carboplatin; 2 cycles every 3 weeks0 aYes, if surgery incompleteNoPositive results of adjuvant chemotherapy trials/poor accrual7.8
China 2005 (40)1999–2004  40NeoQT + Qx vs. Qx aloneGemcitabine + cisplatin; gemcitabine + carboplatin; 2 cycles every 3 weeks2, to respondersNoNoPoor accrual3.3
SLCG 9901 2007 (33)1999–2003136NeoQT + surgery vs. NeoQT + no surgeryCisplatin + gemcitabine + docetaxel; 3 cycles every 3 weeks2, if pathological N2Yes if incomplete resection or not resectableYesN/A4.248.5 for completely resected patients and 16.8 for non-resected patients
NCT0000262 2007 (29)1994–2002579NeoQT+ surgery vs. RTPlatin-based doublet for 3 cyclesN/AYesYesN/A 16.4 for surgery group vs. 17.5 for RT group

a atients who have had a partial or complete response after neoadjuvant chemotherapy NA-CT, neoadjuvant chemotherapy; OS, overall survival; QT, chemotherapy; Qx, surgery; RT, radiotherapy; N/A, not applicable.

The Spanish Lung Cancer Group (36) study included 136 patients with locally advanced NSCLC. Due to the homogeneity of patients enrolled and the geographical location, this is a good reference trial, despite the clear differences in scientific evidence obtained from clinical trials and patient series. The overall complete resection rate was 68.9% among patients eligible for surgery (72% of stage IIIA patients and 66% of stage IIIB patients) and 48% of all assessable patients. In the present study, the overall resection rate for all assessable patients was 85.7%. In the aforementioned trial (36), the rate of complete pathological response was 12.9% of 62 completely resected patients, compared with 42.85% in the present study (of 7 patients undergoing surgery, 3 showed complete pathological response in the surgical specimen). However, the fact that the results may have been strongly influenced by the sample size must be considered.

With regard to CT and surgery-related toxicities, in the Spanish group trial (36), 6/136 patients withdrew from the study due to CT toxicity, and 7 patients (7.8%) died during the postoperative period. The trial used a platin-based regimen with three drugs, which differs from the current standard treatment, a platin-based doublet, as used in the current study. No NA-CT, surgery or radiotherapy treatment was delayed due to secondary effects in the present study cohort, and the surgical death rate was 0%. The safety of this regimen has been evaluated previously in clinical trials; Krzakowski et al (37) investigated the use of this doublet in combination with radiotherapy for the treatment of stage III NSCLC. The median OS time of patients was 15.9 months, and 3-year survival rate was 36.8% (37). In the present study, OS time was 28.5 months, and the 3-year survival rate was 28.5%. In the study by Krzakowski et al (37), the median survival time was 48.5 months in 62 completely resected patients, 12.9 months in 13 incompletely resected patients, and 16.8 months in 15 non-resected patients (P=0.005). In the present study non-resected patients, the OS time was 27 months. However, the higher median OS times observed in the current study may be due to the small sample size.

In the Spanish group trial (36), the 3-year survival rate was 60.1% in completely resected patients and 31.1% in non-resected patients. In the present study, it was 42.8% in surgical patients, and 28.5% in non-surgical patients. In the Spanish group trial study, clinical response and age (<60 years) were the most significant prognostic factors (HR, 0.35; P<0.0001; and HR,0.64; P=0.027, respectively) (36).

In conclusion, cisplatin plus vinorelbine is a feasible regimen in the neoadjuvant setting with good response rates and acceptable toxicity. The most significant factor associated with a poor response to induction treatment was multistation or bulky N2 mediastinal lymph node involvement. However, further studies are required, as long-term survival rates in stage III NSCLC remain low.

Acknowledgements

This study was supported by the Instituto de Investigación Carlos III-PI (grant no. 13/01806) (MP).

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March-2017
Volume 13 Issue 3

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Online ISSN:1792-1082

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Spandidos Publications style
Palka M, Sanchez A, Córdoba M, Díaz Nuevo G, Varela De Ugarte A, Cantos B, Méndez M, Calvo V, Maximiano C, Provencio M, Provencio M, et al: Cisplatin plus vinorelbine as induction treatment in stage IIIA non‑small cell lung cancer. Oncol Lett 13: 1647-1654, 2017.
APA
Palka, M., Sanchez, A., Córdoba, M., Díaz Nuevo, G., Varela De Ugarte, A., Cantos, B. ... Provencio, M. (2017). Cisplatin plus vinorelbine as induction treatment in stage IIIA non‑small cell lung cancer. Oncology Letters, 13, 1647-1654. https://doi.org/10.3892/ol.2017.5620
MLA
Palka, M., Sanchez, A., Córdoba, M., Díaz Nuevo, G., Varela De Ugarte, A., Cantos, B., Méndez, M., Calvo, V., Maximiano, C., Provencio, M."Cisplatin plus vinorelbine as induction treatment in stage IIIA non‑small cell lung cancer". Oncology Letters 13.3 (2017): 1647-1654.
Chicago
Palka, M., Sanchez, A., Córdoba, M., Díaz Nuevo, G., Varela De Ugarte, A., Cantos, B., Méndez, M., Calvo, V., Maximiano, C., Provencio, M."Cisplatin plus vinorelbine as induction treatment in stage IIIA non‑small cell lung cancer". Oncology Letters 13, no. 3 (2017): 1647-1654. https://doi.org/10.3892/ol.2017.5620