LYOPHILIZED PHARMACEUTICAL COMPOSITION OF NEOCARZINOSTATIN DERIVATIVE

Abstract: A lyophilized pharmaceutical composition is produced by dissolving a neocarzinostatin derivative and at least one specific saccharide in a buffer solution, adjusting the pH, sterilizing by filtration, and lyophilizing the resulting solution.

Description: This invention relates to a lyophilized pharmaceutial composition of a neocarzinostatin derivative (hereinafter abbreviated as SMANCS) having a styrene-maleic acid copolymeric residue. SMANCS is a derivative of neocarzinostatin (hereinafter abbreviated as NCS, JP-B-42-21,752) as a proteinaceous anticancer substance, which is synthesized by bonding two molecules of a partially half-esterified styrene-maleic acid copolymer (hereinafter abbreviated as SMA) to one molecule of NCS through acid amide JP-A-60-75,432 and JP-A-60-75,499). That is, it is a cancerocidal substance exhibiting an excellent anticancer activity equal to that of NCS and having a reduced toxicity and a prolonged action as compared with NCS. If it is intended to administer SMANCS to a human by parenteral injection, since SMANCS itself is a peptide, it is preferable that SMANCS is lyophilized and dissolved in an aqueous solvent. SMANCS is stable ina dark cold place (not higher than 5°C, storage in a refrigerator) but is unstable at room temperature even in the lyophilized state. Such unstability is a problem when SMANCS is to be used as a drug and there is a need to develop a lyophilized pharmaceutical preparation of SMANCS having a high heat stability and a good storage stability even at room temperature. It is known that peptides having a biogenic property such as enzymes, hormones and lymphokines are also unstable not only in aqueous solution but also when lyophilized and lose their biogenic property. Therefore, stabilizing agents are widely used to maintain the biogenic property of the peptide and enhance its stability. D-Glucose, D-galactose, D-xylose, D-glucuronic acid, trehalose, dextran and hydroxyethyl starch are known for use as stabilizing agents in the storage, isolation, purification and lyophilization of tumor necrosis factors (JP-A-59-59,625), and polysaccharides such as dextran are known as a stabilizing agent for interferon (JP-A-60-59,000). As a result of various studies on agents for stabilizing interferon against heat, there are known, for example, glycerin and saccharose (JP-B-59-25,333), dextran and hydroxyethyl starch JP-A-60-155,136), glycine, α-alanine and its salt and human serum albumin JP-A-58-146,504), glutamic acid JP-A-59-181,224) and inorganic salts, particularly sodium chloride JP-A-59-25,364). Further, mannitol is widely used as a stabilizing agent and an adjuvant in ordinary lyophilized preparations. However, SMANCS is an NCS derivative obtained by bonding SMA as a polymer to NCS as a high molecular weight biogenic peptide as mentioned above, so that it is a very special cancerocidal substance possessing properties as a peptide and properties as a polymer. Therefore, the aforementioned well-known stabilizing agents for the biogenic peptide can not be applied to SMANCS as they are. In fact, the inventors have attempted the preparation of the lyophilized pharmaceutical composition of SMANCS by using glycine and serum albumin well-known as a stabilizing agent for peptides or mannitol well-known as a stabilizing agent and an adjuvant for lyophilized preparation, but found to improvement in stability. The inventors have made various studies with respect to the lyophilized pharmaceutical composition of SMANCS being stable against heat and found that lactose conventionally known as an adjuvant for tablets and capsules surprisingly develops a remarkable effect on stabilization of SMANCS against heat at the lyophilized state. Furthermore, the inventors have found that the stabilization of SMANCS is similarly attained by disaccharides other than lactose, monosaccharides and dextran. Accordingly the invention provides a lyophilized pharmaceutical composition comprising (a) SMANCS and (b) at least one saccharide selected from monosaccharides, disaccharides and dextran, the SMANCS being a neocarzinostatin derivative represented by the following formula (A): (SMA)-(NCS)-(SMA) , wherein (NCS) is a divalent neocarzinostatin residue in which one hydrogen atom is removed from the primary amino group in both the alanine residue at the N-terminal of neocarzinostatin and the lysine residue at the 20th position from the N-terminal of neocarzinostatin and (SMA) is a monovalent styrene-maleic acid copolymeric residue, which may be partially half-esterified and consists of structural units for 1) styrene residue 2) a residue having the following formula derived by removal of a hydroxyl group from the carboxyl group in a maleic acid residue the carbon atom of the carbonyl group being bonded to the neocarzinostatin residue); and 3), a) maleic acid residue and optionally (b) half-esterified maleic acid residue , in which R is an alcohol residue wherein hydroxyl group is removed from an alkanol having 1 to 4 carbon atoms, an ethylene glycol monoalkyl ether in which the alkyl group has 1 or 2 carbon atoms or a glycerine dialkyl ether wherein the alkyl group has 1 to 2 carbon atoms). The details of SMANCS are disclosed in JP-A-60-75,432 and JP-A-60-75,499, a typical example of which is a compound wherein the styrene-maleic acid copolymeric residue as (SMA), which may be half-esterified, is a half-butyl esterified styrene-maleic acid copolymeric residue (hereinafter abbreviated as Bu-SMANCS). As the monosaccharide, use may be made of glucose, galactose, fructose, mannose or rhamnose. As the disaccharide, use may be made of lactose, saccharose or maltose. The dextran preferably has an average molecular weight of 10,000 to 80,000, and includes for example, Dextran 10, 40 and 70 (whose average molecular weights are 10,000, 40,000 and 70,000, respectively). Among them, the disaccharides such as lactose, saccharose and maltose are preferably used. The amount of the saccharide added is not less than 1.0 mg, preferably about 10 mg to about 50 mg per 1 mg (titer) of SMANCS. Although the effect of the saccharide on the heat stability of lyophilized SMANCS is not yet clear, it is considered to be as follows. In order to stably maintain the activity of SMANCS, the superstructure of the peptide portion in SMANCS should be kept stable. If SMANCS is lyophilized, hydration water existing around the peptide, which is required to form hydrophobic bond relating to the maintenance of the superstructure of peptide portion, is removed and makes the structure of peptide unstable. The saccharide molecule has a strong action of holding the hydration water even during lyophilization and can form a quasi-hydration layer by coordinating the saccharide molecule around the peptide molecule instead of hydration water. It is thus considered that when the saccharide is present in the lyophilzed state, the hydrophobic bond of the peptide portion in SMANCS is maintened ot stably hold the superstructure thereof. As seen from the following experimental examples, the disaccharides exhibit a particularly strong stabilizing effect. This is considered due to the fact that the steric configuration of the hydroxyl group in the molecular structure of the disaccharide has an optimum structure on the interaction through hydrogen bond of peptide portion in SMANCS. The production of the composition according to the invention is carried out, for example, by dissolving SMANCS in a buffer solution, adding a saccharide thereto, adjusting the pH value, sterilizing by filtration in a usual manner and then lyophilizing the solution. In this case, the saccharide may be added to the buffer solution before the dissolution of SMANCS or may simultaneously be added with SMANCS. As the buffer solution, mention may be made of phosphate buffer solution (for example, sodium monohydrogenphosphate-sodium dihydrogenphosphate solution), tris-hydrochloric acid buffer solution, glycine-sodium hydroxide solution and ammonium carbonate buffer solution, among which the phosphate buffer solution is preferably used. The pH of the buffer solution is 7.5∼9.5, preferably about 8.5. The composition according to the invention may also contain usual isotonization agent, soothing agent or adjuvant, which are biogenically suitable and do not obstruct the activity of SMANCS. The isotonisation agent includes sodium chloride the soothing agent includes benzyl alcohol, xylocaine and procaine, and the adjuvant includes polyvinyl pyrolidone. The pH value of the thus obtained solution is adjusted, for example, by using hydrochloride acid or sodium hydroxide (pH=8.0±0.5, preferably pH=about 8.0±0.1). Thereafter, the solution is sterilized by filtration and then lyophilized to obtain the composition according to the invention. In general, the above operation is carried out below room temperature, preferably at a lower temperature (not higher than 10°C, preferably not higher than 5°C) under light shielding. When the lyophilized pharmaceutical composition according to the invention is used as a preparation for injection, it is usually dissolved in an isotonization agent such as physiological saline or glucose in use. The pH of this redissolved composition is within a range of 7.0∼9.5, preferably 7.5∼8.5. When the pH value of the solution is less than 7.0, the acid amide bond between NCS and SMA in the molecule of SMANCS tends to be hydrolyzed in the solution, while when it exceeds 9.5, the biogenic activity of SMANCS tends to be reduced. The lyophilized pharmaceutical composition according to the invention has excellent heat stability. Therefore, the composition according to the invention has great merit in enhancing the utility of SMANCS as an aseptic solution, particularly an injection containing SMANCS as an effective ingredient of carcinostatic agent. The effect of the composition according to the invention will be described with reference to the following experimental examples. All experiments were carried out in a dark place at an illumination of not more than 200 lux. Experimental Example 1 (Temperature stability test of SMANCS) A lyophilized preparation was prepared by pouring Bu-SMANCS solution (containing 2.0 mg (titer) of Bu-SMANCS in 1 mℓ of solution, 1/80M ammonium carbonate buffer solution, pH: 8.5) into vials in an amount of 2.0 mℓ per vial. That is, one vial contained 4.0 mg (titer) of Bu-SMANCS. The shelf stability at 5°C, 15°C, 25°C, 40°C or 50°C was measured with respect to this preparation. Moreover, the titer of Bu-SMANCS was determined by measuring antibacterial activity to Micrococcus luteus ATCC9341 according to a cylinder plate method described in The Japanese Antibiotic Drug Standard. The measured results are represented as a residual activity (%) and shown in the following Table 1. Moreover, the titer at the shelf starting was 100%. At the shelf temperature of 5°C, the residual activity was 97% after 12 weeks, so that the activity was substantially stably maintained. On the other hand, the residual activity lowered to 87% at the shelf temperature of 15°C after 12 weeks, while at the shelf temperature of 25°C, the residual activity lowered to 76% after 8 weeks. Further, the residual activity lowered to 63% after 4 weeks at the shelf temperature of 40°C and to 39% after 4 weeks at the shelf temperature of 50°C. That is, the activity of Bu-SMANCS was stably maintained in the dark place (stored in a refrigerator at 5°C), but the stability considerably lowered at a high temperature. When Bu-SMANCS was stored at room temperature for about 2 months, it was deactiviated by about 25%. Experimental Example 2 (Comparison test of various stabilizing agents on the stabilization of SMANCS) The shelf stability of the composition according to the invention was compared with those of control and comparative products. In this experiment, compositions obtained in the following Examples 1∼7 were used as the composition according to the invention. Furthermore, control product and comparative products were compositions obtained by the following Preparation Examples. Each of these compositions contained 4 mg (titer) of Bu-SMANCS and 5.56 mg of sodium phosphate per 1 vial. The shelf stabilities at 25°C and 40°C were measured over 12 weeks with respect to the lyophilized preparations of these compositions. The measured results are represented as a residual activity (%) and shown in the following Table 2 (20°C) and Table 3 (40°C), respectively. Moreover, the titer at the shelf starting was 100%. As seen from the above results, the residual activity of the control lowered to 73% after 12 weeks at 25°C and 55% after 12 weeks at 40°C, while the residual activity of the composition containing monosaccharide, disaccharide or dextran was maintained at a higher level and the remarkable stabilizing effect was observed. The stabilizing degree became stronger in the order of dextran → monosaccharide → disaccharide. The residual activity of the composition containing the disaccharide was approximately 100% after 12 weeks at 25°C and was maintained at not less than 95% even after 12 weeks at 40°C. Moreover, the shelf conditions of 40°C and 12 weeks were set as a standard for evaluating the stability at room temperature over about 1 year because these conditions corresponded to conditions of 20°C and 48 weeks or shelf condition for about 1 year when the mechanism of decomposition reaction of the substance to be tested is a simple primary reaction. It is apparent from the above that only the monosaccharides, disaccharides and dextran defined in the invention peculiarly stabilize SMANCS among saccharides, polyvalent alcohols, neutral amino acids and human serum albumin conventionally well-known as a stabilizing agent for peptides. The preparation examples of the control and comparative products used in the above experiment will be described below. (The preparation was carried out in a dark place at a temperature of not higher than 5°C and an illumination of not more than 200 lux.) (Preparation Examples of control and Comparative Examples 1∼3) (1) Control 100 mg (titer) of Bu-SMANCS was dissolved in a buffer solution of 0.01M sodium phosphate (pH: 8.0), and adjusted to pH=8.0±0.1 with 0.2N hydrochloric acid and 0.2N sodium hydroxide, and further added with a buffer solution of 0.01M sodium phosphate up to a final liquid volume of 100 mℓ. The resulting solution was sterilized by filtration, poured into vials in an amount of 4 mℓ (4 mg (titer) of Bu-SMANCS) per 1 vial, and then lyophilized to obtain a lyophilized pharmaceutical composition of Bu-SMANCS. (2) Comparative Example 1 To 50 mℓ of Bu-SMANCS solution (containing 2.0 mg (titer) of Bu-SMANCS in 1 mℓ, 0.01M sodium phosphate buffer solution, pH: 8.0) was added 2.0 g of glycine, which was adjusted to pH=8.0±0.1 with 0.2N hydrochloric acid and 0.2N sodium hydroxide and then added with a buffer solution of 0.01M sodium phosphate (pH: 8.0) up to a final liquid volume of 100 mℓ. The resulting solution was sterilized by filtration, poured into vials in an amount of 4 mℓ (4 mg (titer) of Bu-SMANCS) per 1 vial, and then lyophilized to obtain a lyophilized pharmaceutical composition of Bu-SMANCS and glycine. (3) Comparative Example 2 The same procedure as in Comparative Example 1 was repeated except that 2.0 g of mannitol was used instead of glycine to obtain a lyophilized pharmaceutical composition of Bu-SMANCS and mannitol. (4) Comparative Example 3 The same procedure as in Comparative Example 1 was repeated except that 0.2 g of human serum albumin was used instead of glycine to obtain a lyophilized pharmaceutical composition of Bu-SMANCS and human serum albumin. As the clinical application of the composition according to the invention to human body, this composition is dissolved to form an injection solution in use and intravenously or subcutaneously administered to patients unsuitable for oral administration such as a cancer patient, old age patient or abnormal gastrointestinal patient. The composition is desirable to be administered in an amount of 1∼3 mg per dose and at 1∼3 times per day. The kind of objective cancer is a solid tumor and a liquid tumor (leukemia). Moreover, the composition may be applied to tumors in ascites and pleural exudate. The following examples are given in illustration of the invention and are not intended as limitations thereof. Moreover, all preparations were carried out in a dark place at a temperature of not higher than 5°C and an illumination of not more than 200 lux. Example 1 To 50 mℓ of Bu-SMANCS solution (containing 2.0 mg (titer) of Bu-SMANCS in 1 mℓ, 0.01M sodium phosphate buffer solution, pH: 8.0) was added 2.0 g of glucose, which was adjusted to pH=8.0±0.1 with 0.2N hydrochloric acid and 0.2N sodium hydroxide and further added with a buffer solution of 0.01M sodium phosphate up to a final liquid volume of 100 mℓ. The resulting solution was sterilized by filtration, poured into vials in an amount of 4 mℓ (4 mg (titer) of Bu-SMANCS) per 1 vial and then lyophilized to obtain a lyophilized pharmaceutical composition of Bu-SMANCS and glucose. Examples 2∼17 The same procedure as in Example 1 was repeated except that various addition compounds as shown in the following Table 4 were used instead of glucose to obtain lyophilized pharmaceutical compositions having a composition ratio of monosaccharide, disaccharide or dextran as shown in Table 4. All of these compositions contained 4 mg (titer) of Bu-SMANCS per 1 vial. Examples 18∼22 The same procedure as in Example 1 was repeated to obtain lyophilized pharmaceutical compositions having a composition ratio of Bu-SMANCS as shown in the following Table 5.

Claims: Claims for the following Contracting States : AT, BE, CH, DE, IT, NL, SE, GB and FR 1. A lyophilized pharmaceutical composition comprising a neocarzinostatin derivative (abbreviated as SMANCS) having styrene-maleic acid copolymeric residue, and at least one saccharide selected from monosaccharides, disaccharides and dextran, the SMANCS being represented by the following formula; (SMA)-(NCS)-(SMA) , wherein (NCS) is a divalent neocarzinostatin residue in which one hydrogen atom is removed from the primary amino group in both the alanine residue at the N-terminal of neocarzinostatin and the lysine residue at the 20th position from the N-terminal of neocarzinostatin and (SMA) is a monovalent styrene-maleic acid copolymeric residue, which may be partially half-esterified and consists of structural units for 1) styrene residue 2) a residue having the following formula derived by removal of a hydroxyl group from the carboxyl group in a maleic acid the carbon atom of the carbonyl group being bonded to the neocarzinostatin residue); and 3), a) maleic acid residue and optionally b) half-esterified maleic acid residue , in which R is an alcohol residue wherein hydroxyl group is removed from an alkanol having 1 to 4 carbon atoms, an ethylene glycol monoalkyl ether in which the alkyl group has 1 or 2 carbon atoms or a glycerine dialkyl ether wherein the alkyl group has 1 or 2 carbon atoms). 2. A composition according to claim 1, wherein said SMA is a monovalent partially half-butyl esterified styrene-maleic acid copolymeric residue. 3. A composition according to claim 1 or 2 wherein said monosaccharide is glucose or galactose. 4. A composition according to claim 1 or 2, wherein said disaccharide is lactose, saccharose or maltose. 5. A method of producing a lyophilized pharmaceutical composition of SMANCS, which comprises dissolving SMANCS and at least one saccharide selected from monosaccharides, disaccharides and dextran in an amount at least equal to the weight (titer) of SMANCS in a buffer solution having a pH of 7.5 to 9.5, adjusting the pH of the resulting solution to 8.0±0.5, sterilizing by filtration and then lyophilizing the solution, the SMANCS being represented by the formula (SMA)-(NCS)-(SMA) as defined in claim 1. 6. A method according to claim 5, wherein said SMA is monovalent partially half-butyl esterified styrene-maleic acid copolymeric residue. 7. A method according to claim 5 or 6, wherein said monosaccharide is glucose or galactose. 8. A method according to claim 5 or 6, wherein said disaccharide is lactose, saccharose or maltose. 9. A method according to any one for claims 5 to 8 wherein the amount of said saccharide is 10 to 50 times the weight (titer) of said SMANCS. 10. A method according to any one of claims 5 to 9 wherein the pH of the solution is adjusted to 8.0±0.1. Claims for the following Contracting State : ES 1. A method of producing a lyophilized pharmaceutical composition of SMANCS, which comprises dissolving SMANCS and at least one saccharide selected from monosaccharides, disaccharides and dextran in an amount at least equal to the weight (titer) of SMANCS in a buffer solution having a pH of 7.5 to 9.5, adjusting the pH of the resulting solution to 8.0±0.5, sterilizing by filtration and then lyophilizing the solution, the SMANCS being represented by the following formula; (SMA)-(NCS)-(SMA) , wherein (NCS) is a divalent neocarzinostatin residue in which one hydrogen atom is removed from the primary amino group in both the alanine residue at the N-terminal of neocarzinostatin and the lysine residue at the 20th position from the N-terminal of neocarzinostatin and (SMA) is a monovalent styrene-maleic acid copolymeric residue, which may be partially half-esterified and consists of structural units for 1) styrene residue 2) a residue having the following formula derived by removal of a hydroxyl group from the carboxyl group in a maleic acid the carbon atom of the carbonyl group being bonded to the neocarzinostatin residue); and 3), a) maleic acid residue and optionally b) half-esterified maleic acid residue , in which R is an alcohol residue wherein hydroxyl group is removed from an alkanol having 1 to 4 carbon atoms, an ethylene glycol monoalkyl ether in which the alkyl group has 1 or 2 carbon atoms or a glycerine dialkyl ether wherein the alkyl group has 1 or 2 carbon atoms). 2. A method according to claim 1, wherein said SMA is a monovalent partially half-butyl esterified styrene-maleic acid copolymeric residue. 3. A method according to claim 1 or 2 wherein said monosaccharide is glucose or galactose. 4. A method according to claim 1 or 2 wherein said disaccharide is lactose, saccharose or maltose. 5. A method according to any one of the preceding claims wherein the amount of said saccharide is 10 to 50 times the weight (titer) of said SMANCS. 6. A method according to any one of the preceding claims, wherein the pH of the solution is adjusted to 8.0±0.1.

Inventors: KOBAYASHI, MITSUGU, KONNO, TOSHIMITSU, MAEDA, HIROSHI, OHTANI, GO, SEKINO, JUN
Applicants: YAMANOUCHI PHARMACEUTICAL CO. LTD.
Application year: 1988
Main classification: A61K47
IPC codes: A61K47, A61K9