Tamoxifen and the PI3K Inhibitor: LY294002 Synergistically Induce Apoptosis and Cell Cycle Arrest in Breast Cancer MCF-7 Cells oleh Mohamed E. Abdallah, Mahmoud Zaki El-Readi, Mohammad Ahmad Althubiti, Riyad Adnan Almaimani, Amar Mohamed Ismail, Shakir Idris, Bassem Refaat, Waleed Hassan Almalki, Abdullatif Taha Babakr, Mohammed H. Mukhtar, Ashraf N. Abdalla, Omer Fadul Idris