16 september 2008: Bron: Medscape

Suegen - Sutent geeft significant betere overall overleving en significant langere ziektevrije overleving bij GIST patienten die resistent zijn geworden voor Gleevec ( Imatinib). Dit blijkt uit een publicatie van een placebo gecontroleerde gerandomiseerde  fase III trial die afgelopen maand is gepubliceerd. Zie hier de publicatie, daarodner de opzet van de trials zoals die in 2003 zijn gedaan met o.a. ook deelname van Nederlandse ziekenhuizen. U kunt dus in Nederland terecht voor Sugen - Sutent. .

SUTENT demonstrated significant efficacy in imatinib-resistant or -intolerant GIST

SUTENT demonstrated significant efficacy in a large phase 3 trial of imatinib-resistant gastrointestinal stromal tumor (GIST).[1]

Selected Inclusion Criteria[1]
  • Histologically confirmed GIST
  • — Malignant and unresectable
  • GIST following
  • Disease progression during treatment with imatinib (based on RECIST or World Health Organization criteria)—protocol did not require a specific imatinib dose for patients with disease progression
  • — Intolerance to imatinib therapy
  • Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1
  • Adequate organ function


 

STUDY DESIGN: DOUBLE-BLIND, PLACEBO-CONTROLLED, INTERNATIONAL PHASE 3 TRIAL IN GIST[1]
Study design: double-blind, placebo-controlled, international phase III trial in GIST
* Starting dose was 50 mg once daily, 4 weeks on/2 weeks off. Dose reduction was allowed in 12.5-mg increments, to 25 mg/day. Patients received SUTENT or placebo and best supportive care.

Endpoints

  • Primary: time to tumor progression (TTP)
  • Secondary: progression-free survival (PFS), objective response rate (ORR), overall survival (OS), clinical benefit rate (CBR), and duration of response (DR)

Trial Patient Characteristics

      CHARACTERISTICS                          SUTENT                  PLACEBO
Characteristics; Sutent; Placebo
Data on file.[1]
* Primary resistance=progression 6 months; secondary resistance=progression >6 months.

 

SUTENT prolonged median TTP in a large phase 3 trial in imatinib-resistant or -intolerant GIST
  • DSMB* unblinded trial early due to clear emerging benefit[1]
  • Efficacy and safety endpoints were met at the first planned interim analysis (performed after 149 TTP events had occurred)
    • All patients taking placebo were offered the option to immediately cross over to SUTENT
  • SUTENT demonstrated a statistically significant advantage over placebo in TTP (primary endpoint)
  • Median OS has not been reached

SUTENT significantly prolonged median TTP

TIME TO TUMOR PROGRESSION (TTP) [1]
Time to tumor progression (TTP) in imatinib-resistant or -intolerant GIST patients given SUTENT
Multicenter, double-blind, placebo-controlled study of 312 patients with imatinib-resistant or -intolerant GIST who were randomized to receive either SUTENT (50 mg once daily in cycles of 4 weeks on/2 weeks off) or placebo.

67% reduction in risk of progression.[1]

*DSMB=Data Safety Monitoring Board.



 

SUTENT safety and tolerability profile in RCC  -


Nieuwe trials ook in Nederland met Sugen voor GIST-patiënten die resistent voor Gleevec zijn geworden. 17 mei 2004: Bron: liferaftgroup Na de eufotie over Gleevec waar naderhand van blijkt dat bijna alle patiënten daar binnen zeg twee/drie jaar resistent voor worden is er nu een nieuw aanvullend middel onder de naam SUGEN (SU11248) in onderzoek voor GIST - patiënten die resistent zijn geworden voor Gleevec. Vanaf voorjaar 2004 wordt een wereldwijde fase II/III studie opgezet met o.a. deelname van de Erasmus Rotterdam en Academisch ziekenhuis Groningen. Academisch Ziekenhuis Rotterdam Dan. Den Hoed Kliniek Prof. Jaap Verweij start april 2004 en Academisch Ziekenhuis Groningen Dr. Winette vd Graaf start April 2004

Lees verder op deze internationale website voor GIST-patiënten hoe u zich aan kunt melden en beschrijving van trialdoelen.

June 4, 2003 New compound shows promise when Gleevec loses potency in patients with rare digestive-tract cancer Jonathan Fletcher, MD, confers with George Demetri, MD. Patients with the rare digestive-tract cancer known as gastrointestinal stromal tumor (GIST) who develop resistance to the front-line drug Gleevec may benefit from a novel compound that targets specific genetic mutations in GIST cells. At the American Society of Clinical Oncology’s annual meeting in Chicago, scientists from Dana-Farber Cancer Institute presented data from an early stage clinical trial of a new drug called SU11248 in patients with Gleevec-resistant GIST. The study, headed by George Demetri, MD, demonstrated that 11 of the 18 patients (61 percent) with progressive metastatic GIST experienced disease shrinkage or stabilization with no further progression when treated with SU11248. Like Gleevec, SU11248 target specific enzyme switches, called kinases, that keep cancer cells growing. The findings were presented June 1. An estimated 5,000-10,000 cases of GIST are diagnosed in the United States each year. Surgery has been effective in treating some patients when the disease has not spread, but there are few treatment options for those patients in whom the tumor spread beyond the original site of surgery. Last year, the FDA approved the use of Gleevec as the first effective treatment for GIST. Gleevec has proven to be highly beneficial therapy for metastatic GIST, but not all patients can tolerate it and some develop resistance to the drug over time. "Approximately 85 percent of GIST patients benefit from treatment with Gleevec, but, over time, they tend to develop resistance to it and the disease once again begins to grow," says Demetri. "Two-and-a-half years after starting treatment with Gleevec, approximately three-quarters of patients will show some level of resistance to Gleevec. There is no other effective treatment for these patients, and that is why we need new treatment options for them." Last year, Demetri and his colleagues, including Jonathan Fletcher, MD, of Dana-Farber and Michael Heinrich, MD, of Oregon Health and Science University, sought to identify what those additional mutations are and to design a counterattack with a new targeting strategy. They screened a variety of compounds known to act against abnormal enzymes. The results with SU11248, which is now made by Pfizer Oncology of La Jolla, CA, were particularly promising. "SU11248 is a small molecule that inhibits the production of four enzyme switches: KIT, PDGF-R, VEGF-R, and FLT-3," explains Demetri, who is also an associate professor of medicine at Harvard Medical School. "Laboratory and animal studies showed it could be effective in GIST cells that had become resistant to Gleevec. The VEGF-R blockage is particularly interesting, too, since this drug is a powerful anti-angiogenesis drug, blocking the growth of new blood vessels to feed tumors, as well as shutting down other overactive enzyme switches inside the cancer cells." Based on the results of those pre-clinical studies, Demetri and his colleagues began a Phase I clinical trial of SU11248 in patients with Gleevec-resistant GIST. (The main purpose of a Phase I trial is to determine the safe dose for administration of new medications.) Successive groups of patients were treated with SU11248 at starting daily doses of 25, 50, or 75 mg. for 14 days, followed by a 14-day rest period per cycle. The maximum safe dose was determined to be 50 mg. after some patients at the 75-mg. dose level experienced unpleasant, but temporary, side effects (fatigue, nausea and vomiting). The development of SU11248 as a potential treatment for Gleevec-resistant GIST "is an exciting example of the new world of targeted therapy," Demetri remarks. "We can analyze cancer cells to identify mutations, then screen drugs in the laboratory that target those specific mutations. The resulting therapies should be more effective and less toxic than traditional chemotherapy, which tends to attack normal cells as well as cancerous ones." In addition to Fletcher and Heinrich, the study’s other contributor were Annick Van den Abbeele, MD, of Dana-Farber, Christopher Fletcher, MD, of Brigham and Women’s Hospital, and collaborators at Pfizer Oncology (formerly the biotechnology company known as Sugen). Dana-Farber Cancer Institute is a principal teaching affiliate of Harvard Medical School and is among the leading cancer research and care centers in the United States. It is a founding member of the Dana-Farber/Harvard Cancer Center, which has been designated a comprehensive cancer center by the National Cancer Institute.


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