The present invention relates to a pharmaceutical formulation, and more particularly a pharmaceutical formulation of a didemnin compound.
U.S. Pat. No. 5,294,603 to Rinehart claims a pharmaceutical composition comprising a didemnin, in combination with a pharmaceutically acceptable carrier, excipient or diluent. In that patent, extensive results are given for testing for biological activity, notably assay results for cytotoxicity and antiviral activity.
In practice, there are some difficulties in preparing pharmaceutical compositions of didemnin compounds suited for administration to patients, and there is especially a need for a stable parental pharmaceutical dosage form. More specifically, didemnin compounds such as dehydrodidemnin B, also known as aplidine, require mixing with bulking agents, such as mannitol, for optimal, stable preparation of pharmaceutical dosage forms, in particular lyophilised preparations,
Certain bulking agents for this purpose, such as mannitol, require water for solubilisation, while drugs such as aplidine are poorly soluble in water. However, drug delivery to patients requires resuspending of the lyophilised materials before use.
The present invention solves the problem by providing a pharmaceutical composition of a didemnin compound, comprising firstly a lyophilised didemnin preparation including water-soluble materials and secondly a reconstitution solution of mixed solvents. The mixed solvents comprise an aqueous solvent, with the water serving to dissolve the water soluble material and the other solvent serving to dissolve the didemnin compound.
The pharmaceutical formulation of this invention is typically a stable parental pharmaceutical dosage form suited for reconstitution for administration to patients as an antitumor treatment. The invention solves the problem for drugs such as aplidine, which must be presented as lyophilised mixtures of two or more substances soluble in incompatible solvents. It preferably provides, separately bottled or otherwise contained, a premixed three component surfactant/alkanol/water mixture of solvents. In order to allow for proper resuspension of such pharmaceutical dosage forms, the separately packaged solvent mixture is provided to be added to the dry lyophilised preparations containing the drug and water soluble substances such as mannitol, before administration for treatment of disease.
Preferred didemnin compounds for the pharmaceutical compositions of this invention include didemnins and didemnin derivatives, such as dehydrodidemnins, nordidemnins, didemnin congeners and didemnin analogs. The present invention is particularly directed at didemnins with limited water solubility, including for example dehydrodidemnin B, also known as aplidine.
The antitumour agent aplidine (dehydrodidemnin B) is a natural occurring cyclic depsipeptide isolated from the Mediterranean runicate Aplidium albicans. Aplidine has been characterised by using several chromatographic and spectrometric techniques. Solubility testing showed that aplidine exhibits poor aqueous solubility. Moreover, the long-term stability of aplidine in solution is currently unknown.
The lyophilised didemnin preparation is preferably prepared by freeze drying a didemnin/alkanol/water mix, especially using t-butanol as the alkanol. The alkanol/water mix suitably contains 25 to 60% v/v alkanol. A bulking agent such as mannitol can also be included, though other conventional water-soluble additives may be included, known to be of utility in the preparation of such lyophilised dosage forms.
The reconstitution solution preferably comprises a surfactant/alkanol/water mix, especially using a nonionic surfactant and ethanol as the alkanol. The surfactant is suitably 10 to 25% v/v of the mix; the alkanol is suitably 10 to 25% v/v of the mix; and the water is suitably 50 to 80% v/v of the mix.
Freeze-drying was performed from a 1.0 mg/ml solution aplidine in 40% v/v t-butanol in water for injection (“WFI) containing 25 mg/ml mannitol as bulking agent. Differential scanning calorimetry studies were conducted to determine the freeze-drying cycle parameters. The prototype, containing 1.0 mg aplidine and 25 mg mannitol per vial was found to be the optimal formulation in terms of solubility, length of the freeze-during cycle and dosage requirements.
A solution composed of 15/15/70% (v/v/v) Cremophor EL/ethanol absolute/WFI was found to the optimal reconstitution solution, Cremophor EL being a glycerol-polyethylene glycol ricinoleate available from BASF in Germany.
Dilutions of reconstituted product with normal saline up to 1:200 showed it to be stable for at least 24 hours after preparation. Quality control of the freeze-dried formulation demonstrated that the manufacturing process does not change the integrity of aplidine. Shelf-life data, available thus far, show that the formulation is stable for at least 6 months when stored at +4° C. in the dark.
Thus, the preferred aplidine product of this invention is a dual-package containing:
The use of 15/15/70% (v/v/v) Cremophor EL/ethanol/water as reconstitution solution for a lyophilized product is unprecedented. Thus far, the combination of Cremophor EL/ethanol in commercial available products has been used exclusively as solution vehicle (e.g., taxol or cyclosporine).
The development of the Cremophor EL/ethanol/water vehicle provides a potent co-solvent/surfactant system which can be applied as reconstitution solution in future drug formulations and allows the addition of a water soluble bulking agent such as mannitol. Furthermore, by decreasing the relative amount of Cremophor EL, a less toxic vehicle is created.
The manufacturing procedure of the lyophilized product has also a special feature. Normally, freeze-drying of a drug is performed from a drug solution in water. In the case of aplidine, a 40% (v/v) t-butanol/water mixture is preferably used as freeze-drying medium. Although previously described (e.g. rhizoxin), freeze-drying from a 40% t-butanol/water mixture is not common practice.
In conclusion, the combination of lyophilisation of a drug from a t-butanol/water mixture and the subsequent reconstitution of the lyophilized product with 15/15/70% (v/v/v) Cremophor EL/ethanol/water is unique.
Number | Date | Country | Kind |
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9803448.1 | Feb 1998 | GB | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/GB99/00511 | 2/18/1999 | WO | 00 | 5/10/2002 |
Publishing Document | Publishing Date | Country | Kind |
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WO99/42125 | 8/26/1999 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
4342744 | Arai et al. | Aug 1982 | A |
4493796 | Rinehart, Jr. | Jan 1985 | A |
4670262 | Battelli et al. | Jun 1987 | A |
5294603 | Rinehart | Mar 1994 | A |
5438072 | Bobee et al. | Aug 1995 | A |
5462726 | Lodge | Oct 1995 | A |
5573781 | Brown et al. | Nov 1996 | A |
5834586 | Rinehart et al. | Nov 1998 | A |
5883135 | Gyory et al. | Mar 1999 | A |
6030943 | Crumb et al. | Feb 2000 | A |
6034058 | Rinehart et al. | Mar 2000 | A |
6080877 | Swindell et al. | Jun 2000 | A |
6153731 | Rinehart et al. | Nov 2000 | A |
6156724 | Rinehart et al. | Dec 2000 | A |
6365597 | Pribish et al. | Apr 2002 | B1 |
6509315 | Joullié et al. | Jan 2003 | B1 |
6610699 | Cavazza et al. | Aug 2003 | B2 |
6710029 | Rinehart et al. | Mar 2004 | B1 |
6890904 | Wallner et al. | May 2005 | B1 |
7064105 | Joullié et al. | Jun 2006 | B2 |
20010021380 | Pluenneke | Sep 2001 | A1 |
20020098185 | Sims et al. | Jul 2002 | A1 |
20030044893 | Baum et al. | Mar 2003 | A1 |
Number | Date | Country |
---|---|---|
0 048 149 | Mar 1982 | EP |
0 048 149 | Mar 1982 | EP |
0 393 883 | Oct 1990 | EP |
1 054 686 | May 2002 | EP |
2 102 322 | Jul 1997 | ES |
WO 9104985 | Apr 1991 | WO |
WO 9300362 | Jan 1993 | WO |
WO 9801352 | Jan 1998 | WO |
WO 9817275 | Apr 1998 | WO |
WO 9817302 | Apr 1998 | WO |
WO 9850048 | Nov 1998 | WO |
WO 9942125 | Aug 1999 | WO |
WO 0006134 | Feb 2000 | WO |
WO 0071135 | Nov 2000 | WO |
WO 0135974 | May 2001 | WO |
WO 0176616 | Oct 2001 | WO |
WO 0202596 | Jan 2002 | WO |
WO 0230441 | Apr 2002 | WO |
WO 03033013 | Apr 2003 | WO |
WO 2004080421 | Sep 2004 | WO |
Entry |
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