External validation of NTCP-models for radiation pneumonitis in lung cancer patients treated with chemoradiotherapy.

PURPOSE: Normal tissue complication probability (NTCP) models can be used to estimate the risk of radiation pneumonitis (RP). The aim of this study was to externally validate the most frequently used prediction models for RP, i.e., the QUANTEC and APPELT models, in a large cohort of lung cancer patients treated with IMRT or VMAT. [1-2] METHODS AND MATERIALS: This prospective cohort study, included lung cancer patients treated between 2013 and 2018. A closed testing procedure was performed to test the need for model updating. To improve model performance, modification or removal of variables was considered. Performance measures included tests for goodness of fit, discrimination, and calibration. RESULTS: In this cohort of 612 patients, the incidence of RP ≥ grade 2 was 14.5%. For the QUANTEC-model, recalibration was recommended which resulted in a revised intercept and adjusted regression coefficient (from 0.126 to 0.224) of the mean lung dose (MLD),. The APPELT-model needed revision including model updating with modification and elimination of variables. After revision, the New RP-model included the following predictors (and regression coefficients): MLD (B = 0.250), age (B = 0.049, and smoking status (B = 0.902). The discrimination of the updated APPELT-model was higher compared to the recalibrated QUANTEC-model (AUC: 0.79 vs. 0.73). CONCLUSIONS: This study demonstrated that both the QUANTEC- and APPELT-model needed revision. Next to changes of the intercept and regression coefficients, the APPELT model improved further by model updating and performed better than the recalibrated QUANTEC model. This New RP-model is widely applicable containing non-tumour site specific variables, which can easily be collected.

Acute kidney injury and long-term renal effects of alectinib in anaplastic lymphoma kinase-positive non-small cell lung carcinoma: a case report.

BACKGROUND: Targeted therapy with anaplastic lymphoma kinase inhibitor alectinib has become standard therapy for selected patients with non-small cell lung carcinoma. Few data are available on the renal effects of alectinib. We report on a case of acute kidney injury in a patient using alectinib for less than 2 weeks and on serum sodium and creatinine during long-term use of alectinib. CASE PRESENTATION: A 70-year-old Asian woman was diagnosed with metastasized non-small cell lung carcinoma (cT4N3M1c, stage IV) with echinoderm microtubule-associated protein-like 4 and anaplastic lymphoma kinase gene rearrangement and received alectinib, in two daily doses of 600 mg. Eleven days after the initiation of therapy, she was seen at the emergency department with acute kidney injury. Renal biopsy showed lesions in the proximal tubular epithelial cells. Nine days after alectinib cessation, renal function recovered quickly and reintroduction of alectinib in a reduced dose was tolerated, while withholding metformin, enalapril, and naproxen. In seven other patients, data on estimated glomerular filtration rate showed decreased kidney function at 3 months with stabilization at 6 months. Serum sodium at 3 months increased during alectinib treatment and increased further at 6 months. CONCLUSIONS: Our data suggest direct or indirect toxic (proximal) tubulopathy due to alectinib with a good prognosis after cessation. Adverse acute renal effects of alectinib may be prevented by avoiding other medication influencing renal hemodynamics, in particular nonsteroidal anti-inflammatory drugs. Without these co-medications, alectinib could be reintroduced in our patient.

Randomized phase III study of docetaxel versus docetaxel plus intercalated erlotinib in patients with relapsed non-squamous non-small cell lung carcinoma.

BACKGROUND: Earlier preclinical and phase II research showed enhanced effect of docetaxel plus intercalated erlotinib. The NVALT-18 phase III study was designed to compare docetaxel with docetaxel plus intercalated erlotinib in relapsed metastasized non-squamous (NSQ) non-small cell lung cancer (NSCLC). METHODS: Patients with relapsed Epidermal Growth Factor Receptor (EGFR) wild type (WT) NSQ-NSCLC were randomized 1:1 to docetaxel 75 mg/m2 intravenously on day 1 every 21 days (control), or docetaxel 75 mg/m2 intravenously on day 1 plus erlotinib 150 mg/day orally on day 2-16 every 21 days (experimental arm). Progression free survival (PFS) was the primary endpoint, secondary objectives were duration of response, overall survival (OS) and toxicity. RESULTS: Between October 2016 and April 2018 a total of 45 patients were randomized and received treatment in the control (N = 23) or experimental arm (N = 22), the study was stopped due to slow accrual. Median PFS was 4.0 months (95% CI: 1.5-7.1) versus 1.9 months (95% CI 1.4-3.5), p = 0.01 respectively; adjusted hazard ratio (HR) 2.51 (95% CI: 1.16-5.43). Corresponding median OS was 10.6 months (95% CI: 7.0-8.6) versus 4.7 months (95% CI: 3.2-8.6), p = 0.004, with an adjusted HR of 3.67 (95% CI: 1.46-9.27). Toxicity was higher with combination therapy, with toxicity ≥ CTCAE grade 3 in N = 6 (26%) in the control arm and N = 17 (77%) in the experimental arm (p < 0.001), mainly consisting of gastrointestinal symptoms and leukopenia. CONCLUSIONS: Our study shows detrimental effects of docetaxel plus intercalated erlotinib, and strongly discourages further exploration of this combination in clinical practice.

Systematic evaluation of the efficacy-effectiveness gap of systemic treatments in extensive disease small cell lung cancer.

PURPOSE: The aim of this study is to assess how clinical outcomes in real-world (effectiveness) correspond to the outcomes in clinical trials (efficacy) of systemic treatments for extensive disease small cell lung cancer (ED SCLC). METHODS: All patients diagnosed with ED SCLC between 2008 and 2014 in six Dutch large teaching hospitals (Santeon network) were identified and followed-up from date of diagnosis until death or end of data collection. For every patient, an efficacy-effectiveness factor (EE factor) was calculated by dividing individual patients' overall survival (OS) by the pooled median OS assessed from clinical trials with the respective treatment. RESULTS: From 792 diagnosed patients, 568 (72%) started with first-line treatment. Overall, the median EE factor was 0.79 (P < .001 from 1.00). Poor performance status (ECOG≥2) and a higher age at diagnosis (age ≥ 65 years) were independent predictors for a lower EE factor. The EE gap was 43% in patients with both age ≥ 65 years and ECOG ≥2 (EE factor 0.57). The mean age and the proportion of patients with ECOG≥2 in real-world were different from those in clinical trials (mean age of 66 versus 62 years, and ECOG≥2 25% versus 17%; both P < .001). CONCLUSION: OS of patients with ED SCLC treated with systemic therapy in real-world practice is 21% shorter than for patients included in trials. Age at diagnosis and performance status partly explain this gap.

Effects of crizotinib on creatinine clearance and renal hemodynamics.

OBJECTIVES: The tyrosine kinase inhibitor crizotinib may affect renal function. The mechanism of this effect is not understood. We aimed to get more insight by measuring renal hemodynamics in patients treated with crizotinib. MATERIALS AND METHODS: Renal hemodynamics (i.e. glomerular filtration rate and effective renal plasma flow) were measured with radioactive tracers in three patients with stage IV non small-cell lung cancer during treatment with crizotinib. The results were compared with simultaneous creatinine based renal function measurements in the same patients. RESULTS: Patients had been treated with crizotinib between 155 and 320 days at the first measurement. In one patient the measurement was repeated after a total of one year and two months of treatment. All patients had been treated with chemotherapy containing cisplatin before. In these patients true glomerular filtration rate was 64-83% higher than estimated by creatinine based measurements. Filtration fraction, a measure of glomerular pressure, was increased in all three patients. The glomerular pressure was even further increased in a follow-up measurement. CONCLUSION: Creatinine-based estimates of GFR on crizotinib may underestimate the true GFR. However, evidence of increased glomerular pressure may increase risk of long term true nephrotoxicity.

An instrument dedicated for modelling of pulmonary radiotherapy.

BACKGROUND AND PURPOSE: Radiotherapy plays a pivotal role in lung cancer treatment. Selection of patients for new (radio)therapeutic options aiming at improving outcomes requires reliable and validated prediction models. We present the implementation of a prospective platform for evaluation and development of lung radiotherapy (proPED-LUNG) as an instrument enabling multidimensional predictive modelling. MATERIALS AND METHODS: ProPED-LUNG was designed to comprise relevant baseline and follow up data of patients receiving pulmonary radiotherapy with curative intent. Patient characteristics, diagnostic and staging information, treatment parameters including full dose-volume-histograms, tumour control, survival, and toxicity are scored. Besides physician-rated data, a range of patient-rated data regarding symptoms and health-related quality-of-life are collected. RESULTS: After 18 months of accrual, 315 patients have been included (accrual rate, 18 per month). Of the first hundred patients included, 70 received conformal (chemo)radiotherapy and 30 underwent stereotactic radiotherapy. Compliance at 3 and 6 months follow-up was 96-100% for patient-rated, and 81-94% for physician-rated assessments. For data collection, 0.4 FTE were allocated in a 183 FTE department (0.2%). CONCLUSIONS: ProPED-LUNG is feasible with high compliance rates and yields a large amount of high quality prospective disease-related, treatment-related, patient- and physician-rated data which can be used to evaluate new developments in pulmonary radiotherapy.

Concurrent gemcitabine and 3D radiotherapy in patients with stage III unresectable non-small cell lung cancer.

BACKGROUND: Stage III unresectable non-small cell lung cancer (NSCLC) is preferably treated with concurrent schedules of chemoradiotherapy, but none is clearly superior Gemcitabine is a radiosensitizing cytotoxic drug that has been studied in phase 1 and 2 studies in this setting. The aim of this study was to describe outcome and toxicity of low-dose weekly gemcitabine combined with concurrent 3-dimensional conformal radiotherapy (3D-CRT). PATIENTS & METHODS: Treatment consisted of two cycles of a cisplatin and gemcitabine followed by weekly gemcitabine 300 mg/m2 during 5 weeks of 3D-CRT, 60 Gy in 5 weeks (hypofractionated-accelerated). Overall survival (OS), progression-free survival (PFS), and treatment related toxicity according to Common Toxicity Criteria of Adverse Events (CTCAE) version 3.0 were assessed. RESULTS: Between February 2002 and August 2008, 318 patients were treated. Median age was 64 years (range 36-86); 72% were male, WHO PS 0/1/2 was 44/53/3%. Median PFS was 15.5 months (95% confidence interval [CI], 12.9-18.1) and median OS was 24.6 months (95% CI., 21.0-28.1). Main toxicity (CTCAE grade ≥3) was dysphagia (12.6%), esophagitis (9.6%), followed by radiation pneumonitis (3.0%). There were five treatment related deaths (1.6%), two due to esophagitis and three due to radiation pneumonitis. CONCLUSION: Concurrent low-dose gemcitabine and 3D-CRT provides a comparable survival and toxicity profile to other available treatment schemes for unresectable stage III.

Common and rare EGFR and KRAS mutations in a Dutch non-small-cell lung cancer population and their clinical outcome.

INTRODUCTION: In randomly assigned studies with EGFR TKI only a minor proportion of patients with NSCLC have genetically profiled biopsies. Guidelines provide evidence to perform EGFR and KRAS mutation analysis in non-squamous NSCLC. We explored tumor biopsy quality offered for mutation testing, different mutations distribution, and outcome with EGFR TKI. PATIENT AND METHODS: Clinical data from 8 regional hospitals were studied for patient and tumor characteristics, treatment and overall survival. Biopsies sent to the central laboratory were evaluated for DNA quality and subsequently analyzed for mutations in exons 18-21 of EGFR and exon 2 of KRAS by bidirectional sequence analysis. RESULTS: Tumors from 442 subsequent patients were analyzed. For 74 patients (17%) tumors were unsuitable for mutation analysis. Thirty-eight patients (10.9%) had EGFR mutations with 79% known activating mutations. One hundred eight patients (30%) had functional KRAS mutations. The mutation spectrum was comparable to the Cosmic database. Following treatment in the first or second line with EGFR TKI median overall survival for patients with EGFR (n = 14), KRAS (n = 14) mutations and wild type EGFR/KRAS (n = 31) was not reached, 20 and 9 months, respectively. CONCLUSION: One out of every 6 tumor samples was inadequate for mutation analysis. Patients with EGFR activating mutations treated with EGFR-TKI have the longest survival.

Randomized, placebo-controlled phase III study of docetaxel plus carboplatin with celecoxib and cyclooxygenase-2 expression as a biomarker for patients with advanced non-small-cell lung cancer: the NVALT-4 study.

PURPOSE: Cyclooxygenase-2 (COX-2) protein expression in patients with non-small-cell lung cancer (NSCLC) may be not only a prognostic marker but also predictive for COX-2 inhibition. We hypothesized that COX-2 expression is associated with shorter survival and that celecoxib, being a potent COX-2 inhibitor, increases tumor response and survival. PATIENTS AND METHODS: A phase III study was performed in patients with stage IIIb/IV NSCLC who had pathologic confirmation, no prior chemotherapy, Eastern Cooperative Oncology Group performance status of 0 to 2, and adequate organ function. Treatment consisted of docetaxel and carboplatin every 3 weeks for five cycles. Patients were randomly assigned to receive celecoxib 400 mg or placebo twice daily. COX-2 expression on tumor cells was detected by immunohistochemistry. Primary end point was overall survival (OS). RESULTS: From July 2003 to December 2007, 561 patients were randomly assigned. Toxicity was mild, and no increase in cardiovascular events was observed. Tumor response was 38% in the celecoxib arm and 30% in the placebo arm (P = .08). Median progression-free survival was 4.5 months (95% CI, 4.0 to 4.8) for the celecoxib arm and 4.0 months (95% CI, 3.6 to 4.9) for the placebo arm (hazard ratio [HR], 0.8; 95% CI, 0.6 to 1.1; P = .25). Median OS was 8.2 months (95% CI, 7.5 to 8.8) for both treatment arms (HR, 0.9; 95% CI, 0.6 to 1.2; P = .32). COX-2 expression did not independently predict survival. Benefit from celecoxib, restricted to patients with low COX-2 expression, was not significant when adjusted for prognostic factors. CONCLUSION: In advanced NSCLC, celecoxib does not improve survival. In this study, COX-2 expression was not a prognostic biomarker and had no predictive value when celecoxib was added to chemotherapy.

Iris metastasis in small-cell lung carcinoma.

Small-cell lung cancer (SCLC) is characterized by rapid growth and early metastasis. Despite its sensitivity to cytotoxic treatment, until now treatments have failed to control or cure this disease in most patients. Here, we describe a patient with SCLC in which symptoms caused by iris metastasis were the only sign of relapse after multimodality treatment.

Technical description of endoscopic ultrasonography with fine-needle aspiration for the staging of lung cancer.

BACKGROUND: Endoscopic ultrasonography (EUS) is a novel method for staging of the mediastinum in lung cancer patients. The recent development of linear scanners enables safe and accurate fine-needle aspiration (FNA) of mediastinal and upper abdominal structures under real-time ultrasound guidance. However, various methods and equipment for mediastinal EUS-FNA are being used throughout the world, and a detailed description of the procedures is lacking. A thorough description of linear EUS-FNA is needed. METHODS: A step-by-step description of the linear EUS-FNA procedure as performed in our hospital will be provided. Ultrasonographic landmarks will be shown on images. The procedure will be related to published literature, with a systematic literature search. RESULTS: EUS-FNA is an outpatient procedure under conscious sedation. The typical linear EUS-FNA procedure starts with examination of the retroperitoneal area. After this, systematic scanning of the mediastinum is performed at intervals of 1-2cm. Abnormalities are noted, and FNA of the abnormalities can be performed. Specimens are assessed for cellularity on-site. The entire procedure takes 45-60 min. CONCLUSIONS: EUS-FNA is minimally invasive, accurate, and fast. Anatomical areas can be reached that are inaccessible for cervical mediastinoscopy. EUS-FNA is useful for the staging of lung cancer or the assessment and diagnosis of abnormalities in the posterior mediastinum.

Phase II study of docetaxel and carboplatin as second-line treatment in NSCLC.

Aim of this study was to evaluate activity and toxicity of docetaxel and carboplatin as second-line treatment in advanced non-small-cell lung cancer (NSCLC) patients who failed or relapsed after previous chemotherapy. Patients had to have unresectable stage IIIb or IV NSCLC, previous chemotherapy, a performance status < or = 2, a normal bone marrow reserve, and an adequate renal and liver function. Treatment consisted of docetaxel 75 mg/m2 and carboplatin AUC 6 mg/ml min administered every 3 weeks for a maximum of 5 cycles. Fifty-seven patients with a median age of 57 years were included. Prior treatment consisted of gemcitabine alone (n = 2) or gemcitabine in combination with cisplatin (n = 26) or epirubicin (n = 29). Median number of cycles for carboplatin and docetaxel was 4. Granulocytopenia and thrombocytopenia common toxicity criteria (CTC) grades 3 and 4 occurred in 79 and 30% of patients, respectively. Febrile neutropenia occurred in eight patients (14%), of whom two patients died. Fatigue grades 2 and 3 occurred in 42% of patients. Other non-haematological toxicity was mild. Tumour response rate was 37%, irrespective of the previous regimen. Median survival was 31 weeks, 1-year survival was 32%. In conclusion, the combination of docetaxel and carboplatin is active as second-line treatment in platinum and non-platinum pre-treated patients.

Selective targeting of homologous DNA recombination repair by gemcitabine.

PURPOSE: Gemcitabine (2',2'-difluoro-2'-deoxycytidine, dFdC) is a potent radiosensitizer. The mechanism of dFdC-mediated radiosensitization is yet poorly understood. We recently excluded inhibition of DNA double-strand break (DSB) repair by nonhomologous end-joining (NHEJ) as a means of radiosensitization. In the current study, we addressed the possibility that dFdC might affect homologous recombination (HR)-mediated DSB repair or base excision repair (BER). METHODS AND MATERIALS: DFdC-mediated radiosensitization in cell lines deficient in BER and in HR was compared with that in their BER-proficient and HR-proficient parental counterparts. Sensitization to mitomycin C (MMC) was also investigated in cell lines deficient and proficient in HR. Additionally, the effect of dFdC on Rad51 foci formation after irradiation was studied. RESULTS: DFdC did induce radiosensitization in BER-deficient cells; however, the respective mutant cells deficient in HR did not show dFdC-mediated radiosensitization. In HR-proficient, but not in HR-deficient, cells dFdC also induced substantial enhancement of the cytotoxic effect of MMC. Finally, we found that dFdC interferes with Rad51 foci formation after irradiation. CONCLUSION: DFdC causes radiosensitization by specific interference with HR.

A Phase I study of gemcitabine with concurrent radiotherapy in stage III, locally advanced non-small cell lung cancer.

PURPOSE: Our goal was to find the maximum tolerated dose of gemcitabine administered concurrently with thoracic radiotherapy in locally advanced non-small cell lung cancer (NSCLC). PATIENTS AND METHODS: Patients with stage III NSCLC and a radiation planning volume less than 2000 cm(3) were included. Treatment consisted of 6 weeks of thoracic radiation, 2 Gy daily for 5 days a week for a total dose of 60 Gy. Planning with multiple field arrangements and three-dimensional conformal technique was used. Patients were treated with gemcitabine, starting with a dose of 300 mg/m(2) in the 1st week of radiation. In subsequent cohorts, the weekly dosing frequency of gemcitabine was increased until weekly administration was reached. Thereafter, the doses of weekly gemcitabine were increased. Toxicity was measured using Common Toxicity of the National Cancer Institute (CTC), acute Radiation Therapy Oncology Group (RTOG), and late RTOG/European Organization for Research and Treatment of Cancer (EORTC) rating scales. RESULTS: Twenty-seven patients were included, of whom 14 had stage IIIa and 13 had stage IIIb. Dose-limiting toxicity was grade 3 esophagitis and grade 3 radiation pneumonitis in the patient cohort receiving gemcitabine 450 mg/m(2) once weekly. The mean actual treated radiation volume was 760 cm(3) (range, 289-1718 cm(3)). CONCLUSIONS: The maximum tolerated dose and frequency of gemcitabine in locally advanced NSCLC is 300 mg/m(2) once weekly during 6 weeks of thoracic radiotherapy, as long as the treatment volume does not exceed 2000 cm(3).

Comparison of (11)C-choline and (18)F-FDG PET in primary diagnosis and staging of patients with thoracic cancer.

UNLABELLED: PET with (18)F-FDG is used for detection and staging of thoracic cancer; however, more specific PET radiopharmaceuticals would be welcome. (11)C-labeled choline (CHOL) is a new radiopharmaceutical potentially useful for tumor imaging, since it is incorporated into cell membranes as phosphatidylcholine. The aim of this study was to investigate whether (11)C-CHOL PET has advantages over (18)F-FDG PET in patients with thoracic cancer. METHODS: We evaluated 17 patients with thoracic cancer both with (11)C-CHOL PET and (18)F-FDG PET. After transmission scanning, (11)C-CHOL was injected intravenously, and whole-body scanning was started after 5 min. Immediately thereafter, (18)F-FDG was injected intravenously, followed after 90 min by interleaved attenuation-corrected whole-body scanning. Scans were performed from crown to femur. Visual and quantitative (standardized uptake value) analyses of (11)C-CHOL PET and (18)F-FDG PET were performed and compared with results of traditional staging and follow-up. RESULTS: The most prominent features of normal (11)C-CHOL distribution were high uptake in liver, renal cortex, and salivary glands. Except for some uptake in choroid plexus and pituitary gland, brain uptake was negligible. All primary thoracic tumors were detected with (11)C-CHOL PET and (18)F-FDG PET. Both (11)C-CHOL PET and (18)F-FDG PET correctly identified all 16 patients with lymph node involvement. However, in a lesion-to-lesion analysis, (11)C-CHOL PET detected only 29 of 43 metastatic lymph nodes, whereas (18)F-FDG PET detected 41 of 43. (11)C-CHOL PET detected fewer intrapulmonary and pleural metastases than (18)F-FDG PET (27/47 vs. 46/47). More brain metastases were detected with (11)C-CHOL PET (23/23) than with (18)F-FDG PET (3/23). For primary tumors, the median (range) standard uptake values of (11)C-CHOL and (18)F-FDG were 1.68 (0.98-3.22) and 4.22 (1.40-8.26), respectively (P = 0.001). CONCLUSION: (11)C-CHOL PET can be used to visualize thoracic cancers. Although detection of lymph node metastases with (11)C-CHOL PET was inferior compared with (18)F-FDG PET, the detection of brain metastases was superior.