A.W. van Wijk

VU University Amsterdam, Amsterdamo, North Holland, Netherlands

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Publications (8)46.89 Total impact

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    ABSTRACT: Aim Non-small cell lung cancer (NSCLC)-patients with an epidermal growth factor receptor (EGFR)-mutation have median progression-free survival (PFS) of 12 months on tyrosine kinase inhibitors (TKIs). Resistance is mediated by the EGFR T790M-mutation in the majority of patients. Longitudinal follow-up data are lacking. We retrospectively evaluated EGFR-mutated NSCLC-patients who were rebiopsied after TKI-treatment. A subgroup was sequentially rebiopsied along the course of the disease. Patients and methods Advanced EGFR-mutated NSCLC-patients who had both a pre-TKI biopsy and post-TKI biopsy available were included. Information on treatments and (re)biopsies was collected chronologically. Primary endpoint was incidence of T790M-mutation. Results Sixty-six patients fulfilled the inclusion criteria. In first post-TKI biopsies, T790M-mutation was detected in 34 patients (52%) of patients. Twenty-seven patients had subsequent post-TKI rebiopsies with mutation analysis available; in 10 patients (37%) the T790M-status in subsequent post-TKI rebiopsies was not consistent with the T790M-status of the first post-TKI biopsy. Progression free survival (PFS) on TKI-treatment was 12.0 months. Objective response rate on TKI-treatment was 81%. Patients developing T790M-mutation at post-TKI biopsy had longer median PFS compared to T790M-negative patients (14.2 versus 11.1 months respectively (P = 0.034) and longer overall survival (45.9 months versus 29.8 months respectively (P = 0.213). Transformation to SCLC was detected in 1 patient (2%). Conclusion Incidence of T790M-mutation at first post-TKI biopsy in this cohort of EGFR-mutated NSCLC-patients was 50%. Detection of T790M-mutation was not consistent over time; some patients who were T790M-positive at first post-TKI biopsy became T790M-negative in later post-TKI rebiopsies and vice versa. T790M-positive patients showed longer PFS than T790M-negative patients. Whether the low incidence of transformation to SCLC is justifying post-TKI rebiopsy in EGFR-mutated NSCLC-patients with acquired TKI-resistance in regular clinical practice is debatable.
    Full-text · Article · Jul 2014 · Lung cancer (Amsterdam, Netherlands)
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    Full-text · Article · Feb 2014 · European journal of cancer (Oxford, England: 1990)
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    ABSTRACT: Purpose: Sorafenib inhibits the Ras/Raf pathway, which is overactive in cancer patients with a KRAS mutation. We hypothesized that patients with non-small cell lung cancer (NSCLC) with KRAS mutation will benefit from treatment with sorafenib. Experimental design: In this phase II study, patients with KRAS-mutated, stage IIIb or IV NSCLC that progressed after at least one platinum-containing regimen were treated with sorafenib. Treatment consisted of sorafenib 400 mg twice daily until disease progression or unacceptable toxicity. Pretreatment serum from each patient was obtained to predict outcome using a proteomic assay (VeriStrat). Primary endpoint was disease control rate (DCR) at 6 weeks. Results: Fifty-nine patients were entered between May 2010 and February 2011. Fifty-seven patients started sorafenib. Mean age was 58.5 (SD = ±8.1) years, 16 male/41 female, Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0/1/2 24/30/3. At 6 weeks, 5 partial response, 25 stable disease, and 27 progressive disease were observed; DCR was 52.6%. Median duration of treatment was 9 weeks. The median progression-free survival (PFS) was 2.3 months and median overall survival (OS) was 5.3 months. Patients with a prediction of good prognosis according to VeriStrat serum proteomics assay showed a significantly superior PFS [HR, 1.4; 95% confidence interval (CI), 1.0-1.9] but not OS (HR, 1.3; 95% CI, 0.9-1.7). Sorafenib-related grade III/IV toxicity was reported in 10 patients (17.5%); all but one patient experienced grade III skin toxicity (14.0%) or grade III gastrointestinal toxicity (8.8%). Conclusion: Treatment with sorafenib has relevant clinical activity in patients with NSCLC harboring KRAS mutations. Further randomized study with this agent is warranted as single-agent or combination therapy.
    Full-text · Article · Dec 2012 · Clinical Cancer Research

  • No preview · Article · Sep 2011 · European Journal of Cancer
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    ABSTRACT: Tyrosine kinase inhibitors (TKI) of the epidermal growth factor receptor (EGFR) are approved as treatment of non-small-cell lung cancer (NSCLC). Despite an initially impressive response to EGFR-TKIs, patients with an activating EGFR mutation invariably relapse. For these patients few treatment options are available after additional progression during or after chemotherapy. The aim of this study is to examine the effect of retreatment with an EGFR-TKI after a drug holiday. We retrospectively reviewed the medical records of 14 patients with stage IV NSCLC who progressed after long-term disease control with EGFR-TKI, who were subsequently treated with standard chemotherapy and at renewed progression retreated with EGFR-TKI. Fourteen patients (five male, nine female, median age 55 years (39-70 years) received retreatment with erlotinib. The median interval from the discontinuation of EGFR-TKI to the 2nd episode was 9.5 months (3-36 months). Before starting retreatment 36% (n=5) had a T790M mutation. Retreatment resulted in 36% (n=5) partial response, 50% stable disease (n=7) and 14% progressive disease (n=2). Among patients with a T790M mutation this number was two, one and two, respectively. Seven patients are still on therapy without signs of progression. Median follow up is 9 months (1.5-16+months) and median PFS is 6.5 months (1-16+months). Our findings suggest that retreatment with erlotinib is an option for patients with NSCLC who initially benefited from previous EGFR-TKI treatment and progressed after standard cytotoxic chemotherapy.
    Full-text · Article · Jul 2011 · European journal of cancer (Oxford, England: 1990)
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    ABSTRACT: The objectives were to determine the maximum tolerated dose (MTD) of pemetrexed and cisplatin with concurrent radiotherapy. Secondary objectives include incidence and nature of acute and late toxicities, tumor response and overall survival. Treatment naïve patients received 1 cycle of cisplatin 80 mg/m(2) in study I (stage III NSCLC), 75 mg/m(2) in study II (LD-SCLC) and pemetrexed 500 mg/m(2) before the phase I part. In study I, patients were treated in cohorts with escalating cisplatin doses (60-80 mg/m(2)), pemetrexed doses (400-500 mg/m(2)) and concurrent escalating radiotherapy doses (66 Gy in 33-27 fractions). In study II, patients were treated with cisplatin 75 mg/m(2) and escalating pemetrexed doses (400-500 mg/m(2)) with concurrent escalating radiotherapy doses (50-62 Gy). The trials closed prematurely: study I because of poor accrual, study II because of sponsor decision. Thirteen patients were treated: 4 with NSCLC, 9 with LD-SCLC. No dose-limiting toxicity was observed. There was no grade 4 toxicity, grade 3 hematological toxicity was mild. One patient developed grade 3 acute esophagitis, but was able to complete radiotherapy without delay. Two patients experienced grade 2 late pulmonary toxicity, 1 complete response, 6 partial responses and 1 progressive disease were observed. Although the studies stopped too early to assess MTD, we have demonstrated that the combination of cisplatin and pemetrexed with concurrent radiotherapy up to 66 Gy (33 x 2 Gy) is well tolerated and this new combination shows activity in NSCLC. Pemetrexed is the first 3rd generation cytotoxic found to be tolerable at full dose with concurrent radiotherapy.
    No preview · Article · Sep 2010 · Lung cancer (Amsterdam, Netherlands)
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    ABSTRACT: Currently, the inhibitor of the epidermal growth factor receptor tyrosine kinase erlotinib is widely used for the treatment of non-small cell lung cancer. Patients with a mutation or deletion in the epidermal growth factor receptor gene will benefit most and are likely to receive the drug for long periods and willing to accept side effects if responding. Twenty-two cases with prolonged administration of erlotinib (at least 6 months) and side effects are reported. Three cases with specific side effects are described in detail. In addition to the well-known side effects such as folliculitis and diarrhea, patients reported paronychia, fatigue, and hair changes. After prolonged administration of erlotinib in most patients, the initial side effects persist while other inconvenient ones may develop. This may lead to dose reductions or even cessation of treatment.
    Full-text · Article · Sep 2010 · Journal of thoracic oncology: official publication of the International Association for the Study of Lung Cancer
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    ABSTRACT: To investigate the safety and pharmacokinetics of aerosolized Sustained Release Lipid Inhalation Targeting (SLIT) Cisplatin in patients with lung carcinoma. Phase I, dose-escalating study of SLIT Cisplatin given in two sessions daily. Safety data, including laboratory variables, adverse events, pulmonary function tests, and radiographic imaging, were collected and analyzed for all patients to determine toxicity. Pharmacokinetic monitoring was done during the first course. Seventeen patients and one tracheostomy patient on compassionate use received treatment. Aerosolized cisplatin was well tolerated. No dose-limiting toxicity was observed at the maximum delivered dose. Safety data showed no hematologic toxicity, nephrotoxicity, ototoxicity, or neurotoxicity. Most common adverse events were nausea (64.7%), vomiting (47.1%), dyspnea (64.7%), fatigue (64.7%), and hoarseness (47.1%). Pharmacokinetic data showed very low plasma platinum levels only with the longest repeated inhalations. Common Toxicity Criteria grade 2 decrease in forced expiratory volume in one second and diffusing lung capacity for carbon monoxide after one course occurred both in two patients and grade one decrease in forced expiratory volume in one second and diffusing lung capacity for carbon monoxide in six and five patients, respectively. Direct airway deposition via the tracheostomy resulted in clinical deterioration after two cycles best described as bronchitis, completely reversible within days. Overall response: stable disease in 12 patients and progressive disease in 4 patients (one patient received one cycle). Aerosolized liposomal cisplatin was found to be feasible and safe.
    Full-text · Article · May 2007 · Clinical Cancer Research

Publication Stats

182 Citations
46.89 Total Impact Points


  • 2010-2014
    • VU University Amsterdam
      • Department of Radiation Oncology
      Amsterdamo, North Holland, Netherlands
  • 2007-2014
    • VU University Medical Center
      • Department of Pathology
      Amsterdamo, North Holland, Netherlands
  • 2011
    • Universitätsklinikum Schleswig - Holstein
      Kiel, Schleswig-Holstein, Germany