AfatinibA Phase II Evaluation of Afatanib, an Irreversible Human Epidermal Growth Factor Receptor 2 (Her2/Neu) Tyrosine Kinase Inhibitor, in Patients With Persistent or Recurrent HER2-positive Uterine Serous Carcinoma

Exploratory/correlative objectives: To systematically evaluate HER2/neu expression/amplification using standardized scoring criteria for both breast and gastric cancer and correlate clinical response in uterine serous carcinoma patients with HER2/neu scoring results. To correlate objective response rate, PFS and overall survival with the presence/absence of phosphatidyl inositol 3-kinase catalytic subunit and F-box/WD repeat-containing protein mutations by standard Sanger sequencing, and presence/absence of Cyclin E2 overexpression by IHC in endometrial cancer patients overexpressing HER2/neu treated with Afatinib. To study HER2/neu extracellular domain circulating levels in the plasma of uterine serous carcinoma patients overexpressing HER2/neu before and during Afatinib treatment to elucidate whether changes in HER2/neu extracellular domain would predict response to Afatinib and to determine peripheral blood natural killer cell numbers and activity in HER2/neu+ uterine serous carcinoma patients before and during Afatinib treatment to assess the possible therapeutic contributions of immune mechanisms of action of Afatinib.