The present invention relates to a composition of matter having the following characteristics: (i) it is derived from muscle tissue; (ii) it filters through a filler with a maximal molecular weight cut-off of about 10,000 Dalton, preferably less than 3,000 Daltons; and (iii) it has a biological effect of inhibiting proliferation of tumor cells and stimulation of proliferation of leukocytes and neutrophils; and to a method for preparing said composition of matter. Furthermore, the invention relates to pharmaceutical and neutraceutical preparations comprising the composition of matter disclosed herein. According to one embodiment, the pharmaceutical preparation is intended for treating or preventing cancer. The pharmaceutical preparations according to yet a further embodiment may be used for increasing the efficacy of a cytotoxic drug towards target cells, the target cells, being, for example, cancer cells. The pharmaceutical preparations may be administered parentally, however, are preferably administered orally. |