Background: Leptomeningeal disease occurs in 3-5% of patients with lung cancer, mainly adenocarcinoma subtype. Adenocarcinoma is the most common histological finding Asian women.
 Case: A 51-year-old woman right-sided bronchogenic T4N3M1c Std IVB mutation(+) developed decreased vision, severe bilateral sensorineural deafness and psychiatric disorders after receiving Gefitinib 15 months. Th...

PURPOSE To examine the enzyme kinetics of gefitinib and erlotinib metabolism by individual cytochrome P450 (CYP) enzymes, and to compare their effects on CYP3A activity, with the aim to better understand mechanisms underlying pharmacokinetic variability and clinical effects. EXPERIMENTAL DESIGN Enzyme kinetics were examined by incubating gefitinib or erlotinib (1.5-50 micromol/L) with recombi...

Poorly-differentiated colorectal cancers (PD-CRC) show high metastatic potential and poor prognosis. However, molecular characteristics of PD-CRC remain unknown to date, particularly in molecular targeting therapy for patients with PD-CRC. In this study, we examined the expression of EGFR, HER2 and HER3 in PD-CRC by immunohistochemical analysis of archived clinical specimens of primary tumors a...

PURPOSE Abnormally high levels of epidermal growth factor receptor (EGFR) protein are associated with advanced tumor stage/grade. The objective of this study was to evaluate the effects of the specific EGFR tyrosine kinase inhibitor gefitinib on activation of the Akt and mitogen-activated protein kinase (MAPK) pathways in human urothelial cell carcinoma (UCC) cell lines and to identify potentia...

The present study aimed to explore the role of integrin β1 and the relevant signaling pathways in acquired gefitinib resistance in non-small cell lung cancer (NSCLC). The inhibitory effects of gefitinib, with or without LY294002, on cellular proliferation were evaluated by 3-(4,5-dimethylthiazol-2-yl) 2,5-diphenyltetrazolium bromide assay. Cell cycle progression and apoptosis were analyzed by f...

factor receptor mutant vIII; Mdr1, gene encoding the murine p-glycoprotein; MDR1, gene encoding the human p-glycoprotein; Bcrp1, gene encoding the murine breast cancer resistance protein. This article has not been copyedited and formatted. The final version may differ from this version. Abstract Gefitinib is an orally active inhibitor of the epidermal growth factor receptor (EGFR) approved for ...

PURPOSE This study aimed to evaluate the efficacy and safety of pemetrexed versus gefitinib in patients with advanced non-small cell lung cancer (NSCLC) previously treated with chemotherapy. MATERIALS AND METHODS Patients with advanced (stage IIIB or IV) or recurrent NSCLC were randomly assigned to receive either 500 mg/m² of pemetrexed intravenously every 3 weeks or gefitinib 250 mg/day oral...

The activation of epidermal growth factor receptor (EGF-R) plays a key role in the promotion of proliferation and invasion in prostatic carcinoma (PCa). Gefitinib (Iressa; ZD1839), an orally active EGF-R tyrosine kinase inhibitor, has shown an important anti-proliferative activity in tumors expressing EGF-R both in vitro and in vivo. Our aim was to elucidate the role of gefitinib in the modulat...

OBJECTIVE Oral tyrosine kinase inhibitor has been shown to prolong progression-free survival (PFS) in estimated glomerular filtration rate (EGFR) mutation positive adenocarcinoma; however, the comparator arm has not included the current standard adenocarcinoma regimen (pemetrexed carboplatin induction followed by maintenance pemetrexed) and patients from Indian subcontinent. Hence, this study w...

An irreversible ErbB family blocker is expected to inhibit tumors with activating epidermal growth factor receptor (EGFR) mutations more strongly than reversible EGFR tyrosine kinase inhibitors and to overcome acquired resistance to the T790M secondary mutation. Eleven-week-old transgenic mice with Egfr exon 19 deletion mutation were treated with afatinib, gefitinib, or vehicle for 4 weeks. All...