Sahib et al (2019): Nanosphere carrier in human breast cancer November 2019 Vol. 22 (7) © Annals of Tropical Medicine & Public Health S202 The effects of the nanosphere carrier for the combined carmustine-busulfan trastuzumab in human breast cancer tissue culture Zena Hasan Sahib 1 , Sarmad Nory Gany Al-Dujaili 1 , Hussein Abdulkadhim 1 , Rana A. Ghaleb 2 1 Department of Pharmacology and Therapeutics, College of Medicine, University of Kufa 2 Department of Anatomy and Histology, College of medicine, University of Babylon Corresponding author email: drzinahasan@yahoo.com Abstract Cancer of the breast is from the highest cancer type ’s incidence. Cancer in general represents a high therapeutic challenge. Considerable adverse effects and cytotoxicity of highly potent drugs for healthy tissue require the development of novel drug delivery systems to improve pharmacokinetics and result in selective distribution of the loaded agent. Targeted therapy is a novel maneuver to achieve proper selectivity index. And as the main goal of nanocarriers is to target specific sites and improve the circulation time of the drug which is entrapped, encapsulate or conjugate in the carrier system so we chose nanoliposome as a drug carrier. Liposomes improved a potent drug targeting successfully in the last decade, but nanoliposomes offer more surface area and they have more solubility, improve controlled release, enhance bioavailability, and permit precision targeting of the material that is encapsulated to a greater extent. The Aims and objectives of the study is the formulation of HER2 Ab directed nanosphere carrier for a combined Carmustine-busulfan and trastuzumab (LCBT), then Assessing antineoplastic efficacy of (LCBT) in lung carcinoma cell line. A dose-dependent cellular growth inhibition on all three cell lines (P-value < 0.001) was seen. The concentration of 100 μg/ml of LCBT show highly significant inhibitory effect (P-value < 0.001) on cancer cell line in comparison to other concentration and other positive control drugs that forming the combination separately (P-value <0.001). The means of the half-maximal inhibitory concentration (IC50) values for LCBT combination show highly significant difference (P-value < 0.001) from other positive control groups. At the same time, the interaction indexes IAI for LCBT and for LT and LCB separately show synergistic effect that was less than one. The results of the present study also revealed a reduced expression percentages of proliferation marker Ki67 in MCF-7 cancer cell line that was treated with IC50 of LCBT and positive control (LT, LCB, T and CB) after 48 hour from drug exposure in comparison with the negative control group (P-value <0.001). Also, there was a significant decrease in expression percentages in CB containing positive control groups in comparison to T containing positive control (P-value <0.01). From the above results, we conclude that the LCBT has a prominent anticancer effect in MCF- 7 breast cancer cell line as it significantly decreased the growth percentage and show apoptotic effects. Keywords: Carmustine, busulfan, trastuzumab, nanoliposomes, MCF-7 cell line, cytotoxicity. How to cite this article: Sahib ZH, Sl-Dujaili NG, et al (2019): The effect of nanosphere carriers for the combined carmustine-busulfan Trastuzumab in human breast cancer tissue culture Ann Trop Med & Public Health; 22(7): S203. DOI: http://doi.org/10.36295/ASRO.2019.22073 Introduction Cancer is considered as a complex illness characterized by abnormal growth and extent of abnormal cells [1]. Breast cancer is defined as an overgrowth of the healthy cells within the milk- producing glands, such as ducts and lobules. Breast cancer classified according to the specific cell receptors status mainly progesterone receptor, estrogen receptor, and the human epidermal growth receptor (HER2) [2]. All treatment modalities have many side-effects includes loss of appetite nausea and vomiting, diarrhea, decrease in blood cell counts, allergic reaction, bleeding, joint pain, change in taste, tingling or numbness in the fingers or toes, hair loss, and weight gain [3-4]. Nanomedicines are nanoscale implements (1–1000 nm-sized) used in the prevention, treatment, and diagnosis of diseases [5]. Nanocarriers or drug delivery system has very significance includes elongated circulation half-lives, better pharmacokinetics and compact side effects [6]. Drugs loaded into nanoparticles by entrapment, adsorption, or chemical conjugation, their Pharmacokinetics and therapeutic index can be improved as compared to the free drugs. Advantages of nanoparticles drug delivery, principally at the systemic level, that include improve drug solubility in serum and provide sustained, controlled, combined and targeting drug delivery also it can cross the tissues and organs' biological membranes in compare to larger-sized particles [7].