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Sergiu Susman,1,2 Ioana Berindan-Neagoe,3 Bobe Petrushev,3 Radu Pirlog,2 Ioan-Stefan Florian,4 Carmen-Mihaela Mihu,2 Cristian Berce,3 Lucian Craciun,2 Ravnit Grewal,5 Ciprian Tomuleasa3,6,7 1Department of Pathology, Imogen Research Center, 2Department of Morphological Sciences, 3Research Center for Functional Genomics and Translational Medicine, 4Department of Neurosurgery, Iuliu Hatieganu University of Medicine and Pharmacy, 5Department of Hematology, Ion Chiricuta Oncology Institute, 6Department of Hematology, Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania; 7Department of Haematopathology, Tygerberg Academic Hospital, Tygerberg, South Africa Abstract: After introducing the new molecules for the treatment of patients with tumoral pathology, the therapeutical decision will be taken depending on the molecular profile performed upon the harvested tissues. This major modification makes the molecular and morphological analysis an essential part in the clinical management of patients and the pathologist plays an important role in this process. The quality and reproducibility of the results are imperative today and they depend on both the reliability of the molecular techniques and the quality of the tissue we use in the process. Also, the genomics and proteomics techniques, used increasingly often, require high-quality tissues, and pathology laboratories play a very significant role in the management of all phases of this process. In this paper the parameters which must be followed in order to obtain optimal results within the techniques which analyze nucleic acids and proteins were reviewed. Keywords: nucleic acids, proteins, fixation, freezing, molecular techniques