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Any T cell-mediated disease found to benefit from this therapy without affecting other inflammatory pathways

Any T-cell-mediated disease benefits from therapy without affecting other inflammatory pathways

Lung cancer is a major health problem worldwide. Non–small-celllung cancer (NSCLC) accounts for 80% to 85% of all lung cancers,while small-cell lung cancer (SCLC) accounts for 15% to 20% of cases.For early-stage and locally advanced NSCLC (stages I through III), amultimodality treatment approach is appropriate because it improvessurvival. Combination chemotherapy is currently the standard treatmentfor good performance patients with metastatic disease. Elderlypatients (≥ 70 years) with metastatic NSCLC also benefit from treatment.In SCLC, concurrent radiation therapy and chemotherapy is thestandard for limited disease, while chemotherapy is the treatment forextensive disease. Novel innovative therapies, which could includemolecular targeting agents, are needed to treat both NSCLC and SCLC.

Locally advanced non–small-cell lung cancer represents 30% to 40%of all pulmonary malignancies. Most patients will die of the diseaseafter aggressive contemporary treatments. Therefore, significant improvementin therapeutic methods must be implemented to improveoverall survival rates. The arrival of a new generation of chemotherapeuticagents-including the taxanes, gemcitabine (Gemzar), andtopoisomerase inhibitors such as irinotecan (Camptosar) and topotecan(Hycamtin)-offers the hope of significant advances in the treatmentof lung cancer. Irinotecan and topotecan are camptothecin derivativesthat inhibit topoisomerase I enzyme. It is believed that topoisomerase Iinhibitors stabilize a DNA/topoisomerase I complex and interact withreplication machinery to cause cell death. A significant amount of datademonstrates that these topoisomerase I inhibitors also act asradiosensitizers. With the increasing data that support concurrentchemoradiation treatment for malignancies, including lung cancer andhead and neck cancers, there is an impetus to pursue the additionaldrugs that may potentially improve local control and survival. Irinotecanis undergoing early clinical trials in the combined-modality setting inseveral different disease sites. This paper will review the data on therole of camptothecin derivatives as a radiosensitizer and as a componentof combined-modality therapy for lung cancer. It is hoped thatnewer treatment strategies, like the combination of radiation andtopoisomerase I inhibitors, will have a significant impact on cure ratesin the future.

Patients with locally advanced or metastatic nonSMQ-8211-SMQsmall-cell lungcancer (stage III and IV) who are not candidates for surgery and exhibitgood performance status are typically treated with concurrent radiationand platinum-based chemotherapy for disease palliation. Platinum-based chemotherapies, used alone or with radiation therapy, offera small but significant survival benefit compared with supportivecare. The incorporation of first-line agents such as gemcitabine(Gemzar), vinorelbine (Navelbine), and paclitaxel, as well as secondlineagents such as docetaxel (Taxotere), in doublet and triplet combinationshas had a further significant therapeutic impact. Randomizedtrials have shown that cisplatin-based therapy in combination with newagents results in improved 1- and 2-year survival rates in patients withadequate performance status. The 1-year survival benefit has significantlyimproved, with greater symptom relief and improved quality oflife in these patients. Thus, delaying disease progression with combinationchemotherapy appears both beneficial and cost-effective in patientswith advanced nonSMQ-8211-SMQsmall-cell lung cancer. Newer approachesSMQ-8212-SMQincluding targeting critical signaling pathways, such as tyrosine kinasereceptors, angiogenesis, and downstream signal transductionmechanismsSMQ-8212-SMQmay provide novel agents with an improved toxicity profileand the potential for better disease management.

Survival for patients with stage III nonSMQ-8211-SMQsmall-cell lung cancer hasgradually improved in recent years, with median survival times increasingfrom less than 10 months to more than 18 months. These increasesare thought to result primarily from advances in chemoradiation. Thisarticle reviews major advances in the development of chemoradiationfor patients with locally advanced nonSMQ-8211-SMQsmall-cell lung cancer. Resultsfrom cooperative group trials suggest that concurrent chemoradiationis superior to sequential therapy and may replace sequential therapy asthe new standard of care in patients with good performance status.Technological advances such as 18F-fluorodeoxyglucose positron emissiontomography (PET) staging can be used to improve patient selectionand predict survival. Locoregional control may be improved byaltering radiation fractionation or delivery (eg, hyperfractionation, highdoseinvolved-volume radiotherapy, 3D conformal radiotherapy). Novelagents and regimens in combination with radiation are being investigatedto further improve therapeutic outcomes.

Erlotinib (Tarceva) is an orally available selective small-moleculeinhibitor of HER1/EGFR tyrosine kinase with a 50% inhibitory concentrationof 2 nM for purified tyrosine kinase. This agent has beenshown to produce stasis or regression of tumor growth in human cancerxenograft models, including non-small-cell lung cancer models.Ongoing preclinical investigations indicate that inhibition of the MAPKand Atk signaling pathways downstream of HER1/EGFR may be requiredfor optimal antitumor effects. Erlotinib exhibits inhibition ofMAPK and Atk kinases at concentrations higher than those requiredfor HER1/EGFR tyrosine kinase inhibition; such findings suggest thatmaximal inhibition of HER1/EGFR, requiring high erlotinib doses, isnecessary for optimum antitumor activity. These considerations aresupported by tumor models, including non-small-cell lung cancermodels, showing dose-related antitumor effects up to high doses oferlotinib. Erlotinib exhibits additive antitumor effects when combinedwith chemotherapeutic agents (cisplatin, doxorubicin, paclitaxel,gemcitabine [Gemzar], and capecitabine [Xeloda]), radiation therapy,and other targeted agents (eg, bevacizumab [Avastin]). Recent studiesindicate that erlotinib inhibits the EGFRvIII mutant at concentrationshigher than those required for inhibition of wild-type receptor. Ongoinginvestigation will help to determine optimal dosing and dose frequencyof erlotinib in various cancers in the clinical setting.

Breast cancer is the most common noncutaneous malignancy inwomen in industrialized countries. Chemotherapy prolongs survival inpatients with early-stage breast cancer, and maintaining the chemotherapydose intensity is crucial for increasing overall survival. Manypatients are, however, treated with less than the standard dose intensitybecause of neutropenia and its complications. Prophylactic colonystimulatingfactor (CSF) reduces the incidence and duration of neutropenia,facilitating the delivery of the planned chemotherapy doses.Targeting CSF to only at-risk patients is cost-effective, and predictivemodels are being investigated and developed to make it possible forclinicians to identify patients who are at highest risk for neutropeniccomplications. Both conditional risk factors (eg, the depth of the firstcycleabsolute neutrophil count nadir) and unconditional risk factors(eg, patient age, treatment regimen, and pretreatment blood cell counts)are predictors of neutropenic complications in early-stage breast cancer.Colony-stimulating factor targeted toward high-risk patients startingin the first cycle of chemotherapy may make it possible for fulldoses of chemotherapy to be administered, thereby maximizing patientbenefit. Recent studies of dose-dense chemotherapy regimens with CSFsupport in early-stage breast cancer have shown improvements in disease-free and overall survival, with less hematologic toxicity than withconventional therapy. These findings could lead to changes in how earlystagebreast cancer is managed.

This review by Dr. Gore emphasizesthe significance of theproblem of brain metastases inpatients with locally advanced non–small-cell lung cancer (NSCLC). Thearticle should prompt medical and radiationoncologists to consider enrollingpatients in the ambitious study ofprophylactic cranial irradiation (PCI)led by the Radiation Therapy OncologyGroup (RTOG L-0214). Statisticsfrom the ongoing RTOG study arecomplicated, but essentially, the researchersare looking for a 20% increasein median survival for patientsreceiving PCI. This would make theimpact of PCI in NSCLC comparableto that observed in limited small-celllung cancer (SCLC).

Ophthalmic drops that combine immediate antihistamine relief with prophylactic care in the form of mast cell inhibition and eosinophil blockage are the mainstay of therapy for allergic conjunctivitis.

High-dose myeloablative therapy with autologous or allogeneicstem cell rescue is an effective treatment strategy for non-Hodgkin’slymphoma (NHL), but NHL is much less likely to stay in remission afteran autologous transplant than after an allogeneic transplant. Thebenefit of undergoing an autologous transplant earlier in the course ofthe disease, especially for patients who present with intermediate orhigh scores on the International Prognostic Index of risk factors, is stillunclear. The addition of immunotherapy, biologic modifiers, andantibody therapy such as rituximab (Rituxan) or radiolabeled antibodyto the autologous transplant are approaches undergoing evaluation.Historically, there has been a high regimen-related mortality rateassociated with myeloablative allogeneic transplant that has made thisapproach a less appealing option for therapy. The use of nonmyeloablativeallogeneic transplants as treatment for NHL is less well studiedand remains to be defined.

Portland, OR-Researchers in the Casey Eye Institute at Oregon Health & Science University (OHSU) began participation in February in a gene therapy trial for patients with age-related macular degeneration (AMD).

Philadelphia-Gene therapy has successfully restored the visual function of blind dogs with a rare congenital retinal disease, according to early research results. This breakthrough holds implications for the treat- ment of several human retinal degenerative diseases within the next several years.

PHILADELPHIA-T-cell depletion had no clear advantage over immunosuppressive drug therapy in patients receiving a matched, unrelated donor bone marrow transplant, John E. Wagner, MD, reported at the 44th Annual Meeting of the American Society of Hematology (ASH abstract 274).

Non–small-cell lung cancer (NSCLC) accounts for approximately80% of all lung tumors. Patients diagnosed with early-stage diseasegenerally undergo surgery, but up to 50% develop local or distantrecurrences. The benefit of chemotherapy in this disease is modest, butnew drugs and combined strategies offer hope of improved survivalrates. Because the disease recurs outside the chest in 70% of cases, oneof the foremost goals of therapy is to prevent distant dissemination. Tothis end, chemotherapy may be administered preoperatively or afterresection of the tumor. The first part of this article, which concludesnext month, will address adjuvant and neoadjuvant chemotherapy inearly-stage non–small-cell lung cancer.

Bolaños-Meade et al provide aconcise review of tandemtransplantation for patientswith multiple myeloma. High-dosechemotherapy with autologous stemcell support has been shown to improveresponse rates, event-free survival,and overall survival overconventional chemotherapy in a majorrandomized clinical trial-the IntergroupeFrançais du Myélome(IFM)-90 trial.[1] This procedure isnow accepted as the standard of carefor newly diagnosed myeloma patientsyounger than age 70 years. However,the same study demonstrated the needto improve upon single autografts, asthe overall survival rate at 7 years inthe transplant group was only 43%.Conceptual Basis ofTandem AutograftsUsing tandem transplants, investigatorshave aimed to improve outcomesby incrementally achievinghigher complete response rates withrepeated cycles of high-dose therapyrequiring stem cell support. With theirTotal Therapy protocol-a series ofnon–cross-resistant chemotherapyregimens culminating in tandemtransplantation-researchers from theArkansas Cancer Research Centershowed that the complete responserate increased from 26% to 41%following the first and second transplant,respectively.[2] On multivariateanalysis, complete response wasa significant prognostic factor forimproved outcome.

The management of germ cell tumors has advanced dramatically,with cure rates approaching 90% to 95%. Treatment of stage I/Aseminomas generally includes orchiectomy and adjuvant radiotherapy.Treatment of stage I/A nonseminomatous germ cell tumors involvesorchiectomy followed by retroperitoneal lymph node dissection oractive surveillance. One of the major advances has been the introductionof cisplatin-based chemotherapy for metastatic disease and thedevelopment of a system of risk attribution. The logical managementof any patient with curable disease is to provide curative therapy andthen follow the patient in a structured manner, to diagnose and treatany complications in a timely manner.

HOUSTON-Introgen Therapeutics, Inc. has published data from its phase II study combining Advexin, an adenoviral vector containing the p53 tumor-suppressor gene, with radiation therapy in patients with nonmetastatic non-small-cell lung cancer (NSCLC) (Clinical Cancer Research, January 2003). The patients were ineligible to receive surgery or combination therapy with radiation and chemotherapy.

PHILADELPHIA-Remissions induced by gemtuzumab ozogamicin (Mylotarg) monotherapy in patients with first-relapse acute myeloid leukemia (AML) can be prolonged with subsequent therapy. Allogeneic hematopoietic stem cell transplant was particularly effective and even produced some long-term remissions in patients who did not respond to gemtuzumab, Eric Sievers, MD, reported at the 44th Annual Meeting of the American Society of Hematology (ASH abstract 327).

BETHESDA, Maryland-Cell signaling pathways offer many potential targets for antitumor therapies, but hitting those targets is proving more difficult than researchers had anticipated, according to John J. Wright, MD, PhD. He is senior clinical investigator, Investigational Drug Branch, Cancer Therapy Evaluation Program, at the National Cancer Institute in Bethesda, Maryland.

Champlin and colleagues haveelegantly summarized the conceptof nonmyeloablativestem cell transplantation (NST),stressing the importance of this newlyemerging procedure for the treatmentof patients with life-threateningmalignant hematologic and nonhematologicdiseases. This review doesnot include a description of the safetyand efficacy of NST for the treatmentof many life-threateningnonmalignant diseases for which noalternative therapy exists. This categoryencompasses a long list of geneticdisorders, diseases caused by adeficiency of stem cell products, andsyndromes associated with immunedeficiency. However, discussion ofthese illnesses is beyond the scopeof this review, which focuses oncancer.

BRIDGEWATER, New Jersey-The US Food and Drug Administration (FDA) has approved Taxotere (docetaxel, Aventis) as first-line therapy, in combination with cisplatin (Platinol), in patients with unresectable, locally advanced or metastatic non-small-cell lung cancer (NSCLC).

During the 1990s, perhaps no other therapy for women with breast cancer was more controversial than high-dose chemotherapy with autologous bone marrow and/or peripheral stem cell support. With encouraging results from late phase I and early phase II trials in the early to mid-1990s, high-dose chemotherapy was promoted by its many enthusiastic proponents as a potentially great leap forward for women with high-risk, node-positive or metastatic disease.

Interleukin-2 (IL-2, Proleukin) is one of the most effective agents in the treatment of metastatic renal cell carcinoma and metastatic melanoma. High-dose IL-2 therapy produces overall response rates of 15% to 20%;

WASHINGTON-Donna Przepiorka, MD, PhD, formerly of the Baylor College of Medicine and now at the University of Tennessee, Memphis, has become chair of the Food and Drug Administration’s Oncologic Drugs Advisory Committee (ODAC). She replaces Stacy Nerenstone, MD, of Hartford Hospital in Connecticut, whose term expired. Dr. Przepiorka’s research has focused largely on transplantation immunobiol-ogy and she has a background in cellular and gene therapy. Her term as committee chair will end on June 30, 2004.

BERKELEY HEIGHTS, New Jersey-Genta Incorporated has initiated a new clinical trial with its lead anticancer drug Genasense in patients with multiple myeloma. The study will assess the safety and efficacy of Gena-sense in combination with thalidomide (Thalomid) and dexamethasone in patients who have failed standard therapy. The trial will be conducted at the University of Maryland and is sponsored by the NCI pursuant to Genta’s Cooperation Research and Development Agreement (CRADA). Genasense works by inhibiting the production of Bcl-2, a protein made by cancer cells that blocks chemotherapy-induced cell death. Genasense may enhance the effectiveness of current anticancer treatments, Genta said in a news release.

Evry, France-Neurotech will refocus its efforts on ophthalmic technologies, halting research and development activities in the fields of neuroscience and cell therapy.

n ROCKVILLE, Maryland-The FDA’s Oncologic Drugs Advisory Committee (ODAC) voted 11 to 3 that phase II results of AstraZeneca Pharmaceuticals’ EGFR tyrosine kinase inhibitor Iressa (ZD1839, gefitinib) as third-line therapy for advanced non-small-cell lung cancer (NSCLC) were "reasonably likely to predict clinical benefit." The FDA considers this a recommendation for accelerated approval. Look for a complete report of the ODAC decision and a review of the phase II trials of Iressa in NSCLC in next month’s issue of ONI.

Although treatment of advanced non-small-cell lung cancer has been improved with the availability of such new agents as the taxanes, topoisomerase inhibitors, vinorelbine (Navelbine), and gemcitabine (Gemzar), platinum-

Lung cancer is the leading cause of cancer-related death in the United States. There was rapid progress in the treatment of lung cancer during past decades, but local control and survival rates are still poor.