The intracellular kinase domains of the epidermal growth factor receptor(EGFR) in some tumor cells are significant targets for drug discovery.We have developed a new EGFR cell membrane chromatography(EGFR/CMC)-online-...The intracellular kinase domains of the epidermal growth factor receptor(EGFR) in some tumor cells are significant targets for drug discovery.We have developed a new EGFR cell membrane chromatography(EGFR/CMC)-online-high performance liquid chromatography/mass spectrometry(HPLC/MS) method for screening anti-EGFR antagonists from medicinal herbs such as Radix Angelicae Pubescentis.In this study,the HEK293 EGFR cells with high expression of EGFR were used to prepare cell membrane stationary phase(CMSP) in the EGFR/CMC model.The retention fractions on the EGFR/CMC model were directly analyzed by combining a 10 port columns switcher with a HPLC/MS system online.As a result,osthole from Radix Angelicae Pubescentis was found to be the active component acting on EGFR like dasatinib as the control drug.There was a good relationship between their inhibiting effects on EGFR secretion and HEK293 EGFR cell growth in vitro.This new EGFR/CMC-online-HPLC/MS method can be applied for screening anti-EGFR antagonists from TCMs,for instance,Radix Angelicae Pubescentis.It will be a useful method for drug discovery with natural medicinal herbs as a leading compound resource.展开更多
The epidermal growth factor receptors(EGFRs)in some tumor cells are significant targets for drug discovery.In this work,we have developed an EGFR cell membrane chromatography and online high performance liquid chromat...The epidermal growth factor receptors(EGFRs)in some tumor cells are significant targets for drug discovery.In this work,we have developed an EGFR cell membrane chromatography and online high performance liquid chromatography/mass spectrometry system for screening active component from Rhizoma Polygoni Cuspidati.As a result,resveratrol from Rhizoma Polygoni Cuspidati was found to be the active component acting on EGFR like gefitinib.There was a good relationship between their inhibiting effects on EGFR secretion and HEK293 EGFR cell growth in vitro.The EGFR/CMC-online-HPLC/MS system demonstrated fast and effective characteristics for screening leading compounds from traditional Chinese medicine.展开更多
The anti-metabolite chemotherapeutic, gemcitabine is relatively effective for a spectrum of neoplastic conditions that include various forms of leukemia and adenocarcinoma/carcinoma. Rapid systemic deamination of gemc...The anti-metabolite chemotherapeutic, gemcitabine is relatively effective for a spectrum of neoplastic conditions that include various forms of leukemia and adenocarcinoma/carcinoma. Rapid systemic deamination of gemcitabine accounts for a brief plasma half-life but its sustained administration is often curtailed by sequelae and chemotherapeutic-resistance. A molecular strategy that diminishes these limitations is the molecular design and synthetic production of covalent gemcitabine immunoche-motherapeutics that possess properties of selective “targeted” delivery. The simultaneous dual selective “targeted” delivery of gemcitabine at two separate sites on the external surface membrane of a single cancer cell types represents a therapeutic approach that can increase cytosol chemotherapeutic deposition;prolong chemotherapeutic plasma half-life (reduces administration frequency);minimize innocent exposure of normal tissues and healthy organ systems;and ultimately enhance more rapid and thorough resolution of neoplastic cell populations. Materials and Methods: A light-reactive gemcitabine intermediate synthesized utilizing succinimidyl 4,4-azipentanoate was covalently bound to anti-EGFR or anti-HER2/neu IgG by exposure to UV light (354-nm) resulting in the synthesis of covalent immunoche-motherapeutics, gemcitabine-(C4-amide)-[anti-EGFR] and gemcitabine-(C4-amide)-[anti-HER2/neu]. Cytotoxic anti-neoplastic potency of gemcitabine-(C4-amide)-[anti-EGFR] and gemcitabine-(C4-amide)-[anti-HER2/neu] between?gemcitabine-equivalent concentrations of 10-12 M and 10-6 M was determined utilizing chemotherapeutic-resistant mammary adenocarcinoma (SKRr-3). The organoselenium compound, [Se]-methylselenocysteine was evaluated to determine if it complemented the anti-neoplastic potency of the covalent gemcitabine immunoche-motherapeutics. Results: Gemcitabine-(C4-amide)-[anti-EGFR], gemcitabine-(C4-amide)-[anti-HER2/neu] and the dual simultaneous combination of gemcitabine-(C4-amide)-[anti-EGFR] with gemcitabine-(C4-amide)-[a展开更多
Background: Head and neck cancers (HNCs) constitute 5% of all cancers globally and are the most common cancers in India. Chemotherapy and radiotherapy have not been proved to be effective in advanced cases and the pro...Background: Head and neck cancers (HNCs) constitute 5% of all cancers globally and are the most common cancers in India. Chemotherapy and radiotherapy have not been proved to be effective in advanced cases and the prognosis remains dismal. This underscores the need for newer treatment options in these cases. Nimotuzumab, an anti-epidermal growth factor receptor (anti-EGFR) monoclonal antibody, was safer when combined with chemo- or radio-therapy. Aim: To evaluate the safety and efficacy of concurrently administered nimotuzumab with chemo-radiotherapy in patients with advanced inoperable squamous cell carcinomas of head and neck (LASCCHN). Methods:?This was an open-label, single arm study evaluating 57 patients with histologically confirmed inoperable LASCCHN (stages III and IV) and eastern co-operative oncology group (ECOG) performance status < 2. Informed consent was obtained from all patients. The patients were administered IV cisplatin 30 mg/m2?and IV nimotuzumab 200 mg weekly for 6 weeks, along with radiotherapy of 6600 cGy over 33 fractions. Patients were evaluated over response evaluation criteria in solid tumors (RECIST) criteria 24 weeks after the last cycle of chemotherapy. Results: Mean age of patient was 50 years old (29 - 79 years old). The most common site of cancer was oral cavity (56.1%). Forty six patients (80.7%) completed 6 cycles of therapy. Objective response rate (ORR) was 80.7%, with 34 patients (59.6%) achieving complete response (CR), and 12 (21%) achieving partial response (PR). Stable disease (SD) was noted in 8 (14%) patients and progressive disease in 3 (5.2%) patients. Conclusion: Addition of nimotuzumab is a safe and efficacious option in patients with inoperable LASCCHN. Our observations confirm the available Phase II data. The long term survival benefits based on this encouraging response rate need to be further evaluated in this subset of cancer patients.展开更多
K-ras wild-type carcinoma is a tumour that is sensitive to treatment with anti-cancer and anti-EGFR drugs: the combination of Cetuximab and Panitumumab with chemotherapy (Cetuximab) or as a single therapy (Panitumumab...K-ras wild-type carcinoma is a tumour that is sensitive to treatment with anti-cancer and anti-EGFR drugs: the combination of Cetuximab and Panitumumab with chemotherapy (Cetuximab) or as a single therapy (Panitumumab). Case Report: The clinical case presented here refers to a 68-year-old patient who had been diagnosed with adenocarcinoma of the recto sigmoid with pelvic recurrence three years after surgery. The patient had a severe co-morbidity: correlated B-type liver cirrhosis. First-line chemotherapy was begun with Oxaliplatin plus Capecitabine (CAPOXI) following a relapse, and this continued for six months (six cycles), when the treatment was interrupted because of the disease’s progression and hematological and gastrointestinal toxicity. Following an assessment of the K-ras, diagnosed as wild type, the patient was excluded from second-line chemotherapy treatment because of decompensated cirrhosis and the persistence of thrombocytopenia and leukopenia. The patient was put forward for biological treatment with an anti-EGFR monoclonal antibody (Panitumumab). Panitumumab was administered at a dosage of 6 mg/kg every 2 weeks for 17 months;the treatment was well tolerated, despite the cirrhosis, and the main toxicity was the skin rash. Conclusion: In patients with severe comorbidities such as cirrhosis of the liver and K-ras wild-type carcinomas, therapy with a monoclonal antibody such as Panitumumab is a treatment that is well tolerated, with few serious toxic side-effects;it also offers advantages in terms of survival and clinical benefits.展开更多
Colorectal cancer is a heterogeneous disease.Activating mutations in genes like K-RAS,BRAF,and PI3K contribute towards a poor prognosis of the disease.In this report,we present the case of re-treatment of a 58-year ol...Colorectal cancer is a heterogeneous disease.Activating mutations in genes like K-RAS,BRAF,and PI3K contribute towards a poor prognosis of the disease.In this report,we present the case of re-treatment of a 58-year old patient of metastatic colorectal cancer with a combination of anti-EGFR and chemotherapy.The patient who harbored wild-type RAS gene was administered several lines of therapies including anti-EGFR antibodies.In spite of the different regimens involved,a significant progression of disease involving metastasis to the lungs and the brain was observed.On re-treatment with cetuximab and chemotherapy,the quality of life improved and the tumor biomarkers decreased.Re-treatment with anti-EGFR antibodies and chemotherapeutic agents can be an option for patients showing adverse prognosis after several lines of therapies.展开更多
头颈部鳞状细胞癌(squamous cell carcinoma of the head and neck,SCCHN)是最常见的一类头颈部肿瘤。由于早期症状不典型,大多数SCCHN患者确诊时已处于局部晚期。以标准剂量顺铂为基础的同期放化疗(chemoradiotherapy,CRT)是局部晚期SC...头颈部鳞状细胞癌(squamous cell carcinoma of the head and neck,SCCHN)是最常见的一类头颈部肿瘤。由于早期症状不典型,大多数SCCHN患者确诊时已处于局部晚期。以标准剂量顺铂为基础的同期放化疗(chemoradiotherapy,CRT)是局部晚期SCCHN患者的标准非手术治疗模式。但同期CRT的近期和远期毒性问题不容忽视,对于无法耐受标准治疗强度的患者,在治疗策略的选择上要兼顾疗效、器官毒性和器官功能。几乎所有的SCCHN都会存在表皮生长因子受体(epidermal growth factor receptor,EGFR)过表达。抗EGFR单抗通过与EGFR结合,竞争性阻断内源性EGFR天然配体,阻碍EGFR二聚体的形成,抑制肿瘤细胞生长;此外,抗EGFR单抗可通过影响细胞周期、DNA损伤修复及血管生成等多种途径发挥放疗增敏作用。既往Ⅲ期临床研究表明,对比单纯放疗,放疗联合西妥昔单抗可显著改善局部晚期SCCHN患者的局部区域控制,延长总生存期。临床工作中合理地应用抗EGFR单抗仍面临诸多挑战,包括适用人群的判定标准、应用时机、联合方案的选择及不良事件管理等都需要进一步明确和规范。本共识专家组以循证医学证据为基础、相关指南为依据,经充分讨论形成《抗EGFR单抗治疗局部晚期头颈部鳞状细胞癌临床共识(2023年版)》。根据本共识的专家建议,局部晚期SCCHN患者在同期CRT前,应评估患者对标准剂量顺铂治疗的耐受性和治疗毒性。对于无法耐受标准剂量顺铂治疗的患者,或在接受多西他赛+顺铂+5-氟尿嘧啶(TPF)方案诱导化疗后出现顺铂相关毒性的患者,可选择放疗联合西妥昔单抗方案。对于有降期或器官功能保留需求、拟行诱导治疗的患者,标准诱导治疗方案为TPF方案,不能耐受TPF方案毒性的患者,可用西妥昔单抗替代5-氟尿嘧啶,采用TPE方案。安全性方面,放疗联合西妥昔单抗相关常见不良反应包括痤疮样皮疹、口腔黏展开更多
基金supported by the National Natural Science Foundation of China (30730110)Program for New Century Excellent Talents in University (NCET-08-0437)
文摘The intracellular kinase domains of the epidermal growth factor receptor(EGFR) in some tumor cells are significant targets for drug discovery.We have developed a new EGFR cell membrane chromatography(EGFR/CMC)-online-high performance liquid chromatography/mass spectrometry(HPLC/MS) method for screening anti-EGFR antagonists from medicinal herbs such as Radix Angelicae Pubescentis.In this study,the HEK293 EGFR cells with high expression of EGFR were used to prepare cell membrane stationary phase(CMSP) in the EGFR/CMC model.The retention fractions on the EGFR/CMC model were directly analyzed by combining a 10 port columns switcher with a HPLC/MS system online.As a result,osthole from Radix Angelicae Pubescentis was found to be the active component acting on EGFR like dasatinib as the control drug.There was a good relationship between their inhibiting effects on EGFR secretion and HEK293 EGFR cell growth in vitro.This new EGFR/CMC-online-HPLC/MS method can be applied for screening anti-EGFR antagonists from TCMs,for instance,Radix Angelicae Pubescentis.It will be a useful method for drug discovery with natural medicinal herbs as a leading compound resource.
基金This work was supported by the National Natural Science Foundation of China(Grant number 30730110).
文摘The epidermal growth factor receptors(EGFRs)in some tumor cells are significant targets for drug discovery.In this work,we have developed an EGFR cell membrane chromatography and online high performance liquid chromatography/mass spectrometry system for screening active component from Rhizoma Polygoni Cuspidati.As a result,resveratrol from Rhizoma Polygoni Cuspidati was found to be the active component acting on EGFR like gefitinib.There was a good relationship between their inhibiting effects on EGFR secretion and HEK293 EGFR cell growth in vitro.The EGFR/CMC-online-HPLC/MS system demonstrated fast and effective characteristics for screening leading compounds from traditional Chinese medicine.
文摘The anti-metabolite chemotherapeutic, gemcitabine is relatively effective for a spectrum of neoplastic conditions that include various forms of leukemia and adenocarcinoma/carcinoma. Rapid systemic deamination of gemcitabine accounts for a brief plasma half-life but its sustained administration is often curtailed by sequelae and chemotherapeutic-resistance. A molecular strategy that diminishes these limitations is the molecular design and synthetic production of covalent gemcitabine immunoche-motherapeutics that possess properties of selective “targeted” delivery. The simultaneous dual selective “targeted” delivery of gemcitabine at two separate sites on the external surface membrane of a single cancer cell types represents a therapeutic approach that can increase cytosol chemotherapeutic deposition;prolong chemotherapeutic plasma half-life (reduces administration frequency);minimize innocent exposure of normal tissues and healthy organ systems;and ultimately enhance more rapid and thorough resolution of neoplastic cell populations. Materials and Methods: A light-reactive gemcitabine intermediate synthesized utilizing succinimidyl 4,4-azipentanoate was covalently bound to anti-EGFR or anti-HER2/neu IgG by exposure to UV light (354-nm) resulting in the synthesis of covalent immunoche-motherapeutics, gemcitabine-(C4-amide)-[anti-EGFR] and gemcitabine-(C4-amide)-[anti-HER2/neu]. Cytotoxic anti-neoplastic potency of gemcitabine-(C4-amide)-[anti-EGFR] and gemcitabine-(C4-amide)-[anti-HER2/neu] between?gemcitabine-equivalent concentrations of 10-12 M and 10-6 M was determined utilizing chemotherapeutic-resistant mammary adenocarcinoma (SKRr-3). The organoselenium compound, [Se]-methylselenocysteine was evaluated to determine if it complemented the anti-neoplastic potency of the covalent gemcitabine immunoche-motherapeutics. Results: Gemcitabine-(C4-amide)-[anti-EGFR], gemcitabine-(C4-amide)-[anti-HER2/neu] and the dual simultaneous combination of gemcitabine-(C4-amide)-[anti-EGFR] with gemcitabine-(C4-amide)-[a
文摘Background: Head and neck cancers (HNCs) constitute 5% of all cancers globally and are the most common cancers in India. Chemotherapy and radiotherapy have not been proved to be effective in advanced cases and the prognosis remains dismal. This underscores the need for newer treatment options in these cases. Nimotuzumab, an anti-epidermal growth factor receptor (anti-EGFR) monoclonal antibody, was safer when combined with chemo- or radio-therapy. Aim: To evaluate the safety and efficacy of concurrently administered nimotuzumab with chemo-radiotherapy in patients with advanced inoperable squamous cell carcinomas of head and neck (LASCCHN). Methods:?This was an open-label, single arm study evaluating 57 patients with histologically confirmed inoperable LASCCHN (stages III and IV) and eastern co-operative oncology group (ECOG) performance status < 2. Informed consent was obtained from all patients. The patients were administered IV cisplatin 30 mg/m2?and IV nimotuzumab 200 mg weekly for 6 weeks, along with radiotherapy of 6600 cGy over 33 fractions. Patients were evaluated over response evaluation criteria in solid tumors (RECIST) criteria 24 weeks after the last cycle of chemotherapy. Results: Mean age of patient was 50 years old (29 - 79 years old). The most common site of cancer was oral cavity (56.1%). Forty six patients (80.7%) completed 6 cycles of therapy. Objective response rate (ORR) was 80.7%, with 34 patients (59.6%) achieving complete response (CR), and 12 (21%) achieving partial response (PR). Stable disease (SD) was noted in 8 (14%) patients and progressive disease in 3 (5.2%) patients. Conclusion: Addition of nimotuzumab is a safe and efficacious option in patients with inoperable LASCCHN. Our observations confirm the available Phase II data. The long term survival benefits based on this encouraging response rate need to be further evaluated in this subset of cancer patients.
文摘K-ras wild-type carcinoma is a tumour that is sensitive to treatment with anti-cancer and anti-EGFR drugs: the combination of Cetuximab and Panitumumab with chemotherapy (Cetuximab) or as a single therapy (Panitumumab). Case Report: The clinical case presented here refers to a 68-year-old patient who had been diagnosed with adenocarcinoma of the recto sigmoid with pelvic recurrence three years after surgery. The patient had a severe co-morbidity: correlated B-type liver cirrhosis. First-line chemotherapy was begun with Oxaliplatin plus Capecitabine (CAPOXI) following a relapse, and this continued for six months (six cycles), when the treatment was interrupted because of the disease’s progression and hematological and gastrointestinal toxicity. Following an assessment of the K-ras, diagnosed as wild type, the patient was excluded from second-line chemotherapy treatment because of decompensated cirrhosis and the persistence of thrombocytopenia and leukopenia. The patient was put forward for biological treatment with an anti-EGFR monoclonal antibody (Panitumumab). Panitumumab was administered at a dosage of 6 mg/kg every 2 weeks for 17 months;the treatment was well tolerated, despite the cirrhosis, and the main toxicity was the skin rash. Conclusion: In patients with severe comorbidities such as cirrhosis of the liver and K-ras wild-type carcinomas, therapy with a monoclonal antibody such as Panitumumab is a treatment that is well tolerated, with few serious toxic side-effects;it also offers advantages in terms of survival and clinical benefits.
文摘Colorectal cancer is a heterogeneous disease.Activating mutations in genes like K-RAS,BRAF,and PI3K contribute towards a poor prognosis of the disease.In this report,we present the case of re-treatment of a 58-year old patient of metastatic colorectal cancer with a combination of anti-EGFR and chemotherapy.The patient who harbored wild-type RAS gene was administered several lines of therapies including anti-EGFR antibodies.In spite of the different regimens involved,a significant progression of disease involving metastasis to the lungs and the brain was observed.On re-treatment with cetuximab and chemotherapy,the quality of life improved and the tumor biomarkers decreased.Re-treatment with anti-EGFR antibodies and chemotherapeutic agents can be an option for patients showing adverse prognosis after several lines of therapies.
文摘头颈部鳞状细胞癌(squamous cell carcinoma of the head and neck,SCCHN)是最常见的一类头颈部肿瘤。由于早期症状不典型,大多数SCCHN患者确诊时已处于局部晚期。以标准剂量顺铂为基础的同期放化疗(chemoradiotherapy,CRT)是局部晚期SCCHN患者的标准非手术治疗模式。但同期CRT的近期和远期毒性问题不容忽视,对于无法耐受标准治疗强度的患者,在治疗策略的选择上要兼顾疗效、器官毒性和器官功能。几乎所有的SCCHN都会存在表皮生长因子受体(epidermal growth factor receptor,EGFR)过表达。抗EGFR单抗通过与EGFR结合,竞争性阻断内源性EGFR天然配体,阻碍EGFR二聚体的形成,抑制肿瘤细胞生长;此外,抗EGFR单抗可通过影响细胞周期、DNA损伤修复及血管生成等多种途径发挥放疗增敏作用。既往Ⅲ期临床研究表明,对比单纯放疗,放疗联合西妥昔单抗可显著改善局部晚期SCCHN患者的局部区域控制,延长总生存期。临床工作中合理地应用抗EGFR单抗仍面临诸多挑战,包括适用人群的判定标准、应用时机、联合方案的选择及不良事件管理等都需要进一步明确和规范。本共识专家组以循证医学证据为基础、相关指南为依据,经充分讨论形成《抗EGFR单抗治疗局部晚期头颈部鳞状细胞癌临床共识(2023年版)》。根据本共识的专家建议,局部晚期SCCHN患者在同期CRT前,应评估患者对标准剂量顺铂治疗的耐受性和治疗毒性。对于无法耐受标准剂量顺铂治疗的患者,或在接受多西他赛+顺铂+5-氟尿嘧啶(TPF)方案诱导化疗后出现顺铂相关毒性的患者,可选择放疗联合西妥昔单抗方案。对于有降期或器官功能保留需求、拟行诱导治疗的患者,标准诱导治疗方案为TPF方案,不能耐受TPF方案毒性的患者,可用西妥昔单抗替代5-氟尿嘧啶,采用TPE方案。安全性方面,放疗联合西妥昔单抗相关常见不良反应包括痤疮样皮疹、口腔黏
