cardiac toxicity of combining herceptin w pertuzumab
 

two of the three of our favorite triple cure in mice (herceptin+pertuzumab+iressa)

Clin Cancer Res. 2008 May 1;14(9):2710-6.

Cardiac toxicity and efficacy of trastuzumab combined with pertuzumab in patients with trastuzumab-insensitive human epidermal growth factor receptor 2-positive metastatic breast cancer.

Portera CC, Walshe JM, Rosing DR, Denduluri N, Berman AW, Vatas U, Velarde M, Chow CK, Steinberg SM, Nguyen D, Yang SX, Swain SM.
Authors' Affiliations: Medical Oncology Branch, National Cancer Institute.
PURPOSE: To evaluate safety and efficacy of trastuzumab with pertuzumab in patients with human epidermal growth factor receptor 2 (HER2)-positive metastatic breast cancer who had progressive disease on trastuzumab-based therapy. EXPERIMENTAL DESIGN: Patients with measurable HER2(+) metastatic breast cancer, </=3 trastuzumab-based regimens, and left ventricular ejection fraction (LVEF) >/=55% received 8 or 6 mg/kg trastuzumab and 840 mg pertuzumab i.v. followed by 6 mg/kg trastuzumab and 420 mg pertuzumab every 3 weeks. Cardiac evaluation and tumor response were assessed every 3 and 6 weeks, respectively. RESULTS: Eleven patients received 64 cycles of trastuzumab plus pertuzumab. A total of 92 echocardiograms and 8 cardiac magnetic resonance imaging studies were done. With the lower limit of normal LVEF 55%, left ventricular systolic dysfunction was observed in six patients, three grade 1, two grade 2, and one grade 3 according to the National Cancer Institute Common Terminology Criteria for Adverse Events. The objective response rate was 18%. Two patients had partial responses, three had stable disease, and six had progressive disease. The median time to progression was 6 weeks. In baseline tumors from formalin-fixed paraffin-embedded primary and/or metastatic tumor biopsies, pHER2-Y1248 trended toward an increase in patients with partial response compared with those with stable disease/progressive disease (P = 0.095). CONCLUSION: Trastuzumab plus pertuzumab may have clinical benefit in selected patients who have previously been treated with trastuzumab. Cardiac toxicity, although asymptomatic in most cases, was associated with this treatment. Further evaluation of efficacy of this combination is required to define the overall risks and benefits.

Hmmm...thanks Lani for your vigilance...this is disturbing news....lets hope that the follow-up studies find that this is not as much of a problem as it might first seem...B

yes indeed worrying hope this is not going to stop research going that way. thanks Lani for posting