CN114685435A

CN114685435A - Alitinib maleate crystal form and preparation thereof

Info

Publication number: CN114685435A
Application number: CN202011575325.4A
Authority: CN
Inventors: 翟立海; 张明明; 张朝花; 朱志英
Original assignee: Lunan Pharmaceutical Group Corp
Current assignee: Lunan Pharmaceutical Group Corp
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2022-07-01
Anticipated expiration: 2040-12-28
Also published as: CN114685435B

Abstract

The invention provides an axitinib maleate crystal form, and relates to the technical field of crystal form drug molecules. The crystal form uses Cu-Kalpha radiation, and an X-ray diffraction spectrogram expressed by 2 theta has characteristic peaks at 7.68 +/-0.2 degrees, 13.52 +/-0.2 degrees, 17.89 +/-0.2 degrees, 18.54 +/-0.2 degrees, 19.79 +/-0.2 degrees, 20.23 +/-0.2 degrees, 26.02 +/-0.2 degrees; the crystallography measurement parameters were: monoclinic system, space group is P-1; the unit cell parameters are:

α is 75.4240(10) °, β is 63.539(2) °, γ is 76.7100(10) °, unit cell volume

Description

Alitinib maleate crystal form and preparation thereof

Technical Field

The invention relates to the technical field of crystal form drug molecules, in particular to an axitinib maleate crystal form.

Background

Axitinib is whiteOr a white-like powder having the chemical name: 6- [2- (methylcarbamoyl) phenylsulfanyl]-3-E- [2- (pyridin-2-yl) ethenyl]Indazole of formula C₂₂H₁₈N₄OS, molecular weight 386.48, CAS number 319460-85-0, structure as follows:

the axitinib raw mill was the united states pyroxene company, which first obtained FDA approval in the united states in month 1 of 2012. Ashitabine was approved for CFDA on day 29/4 of 2015 for use in adult patients who had previously received advanced Renal Cell Carcinoma (RCC) for which treatment with one of the tyrosine kinase inhibitors or cytokines failed. Axitinib is currently marketed in several countries, including the united states, europe, canada, australia, korea, japan, etc., and has become one of the standard treatment regimens for advanced kidney cancer. The axitinib is a novel oral Tyrosine Kinase Inhibitor (TKI), can effectively and selectively inhibit vascular endothelial growth factor receptors VEGFR-l, VEGFR-2 and VEGFR-3, inhibit the neogenesis of blood vessels and lymphatic vessels, inhibit the growth and metastasis of tumors and play a role in antitumor activity. The medicine has the effects of inhibiting tumor growth and cancer progression by blocking protein kinase in tumor growth process. In a randomized, open, international multicenter phase III clinical trial, axitinib significantly extended progression-free survival compared to sorafenib in a previously treated patient with advanced renal cell carcinoma, and showed overall good safety.

As is well known, the crystal form of a drug has a great influence on the stability, dissolution rate, permeability, bioavailability and the like of a solid pharmaceutical preparation, and an excellent crystal form suitable for preparing the solid pharmaceutical preparation generally needs to meet the requirements of various aspects such as stability, dissolution rate, bioavailability and the like. The new salt form of the medicine is a supermolecular crystal with a fixed stoichiometric ratio, which is formed by introducing a new eutectic substance (CCF) through proton transfer and self-assembling with a medicinal active ingredient (APT) under the action of a hydrogen bond. In the preclinical development stage of a medicament, a new medicament research and development company generally improves the solubility, dissolution rate, permeability, hygroscopicity, stability and bioavailability of the medicament and other physicochemical properties of the medicament by salifying a pharmaceutically active ingredient (APT). Compared with the nanocrystalline, the solid dispersant and the new medicament form technology, the medicament salt form has obvious advantages in the aspects of improving the solubility, dissolution rate, permeability, hygroscopicity, stability and bioavailability of the medicament.

Various crystalline forms of axitinib have been reported at present, and patent WO2006048751a1 discloses various crystalline forms of axitinib, such as crystalline form I, crystalline form ii, crystalline form iii, crystalline form IV, crystalline form vi, crystalline form vii, crystalline form viii, and the like, and discloses that the solubility of crystalline form IV is about 0.55mg/ml in an aqueous solution with the pH of about 1, the solubility is only 0.157mg/ml in an aqueous solution with the pH of about 2, and the solubility is only 2 μ g/ml in an aqueous solution with the pH of about 6.5; it was also reported that in order to improve the water solubility of axitinib, 7 axitinic acid salt compounds were prepared, which had improved solubility but which showed significant degradation upon exposure to high intensity light. Patent CN200880016453 discloses various crystal forms of crystal form XXV, crystal form XVI, crystal form XLI, crystal form IX, crystal form XII and crystal form XV, which are not greatly improved in terms of solubility and bioavailability.

In addition, patent WO2015067224a1 further characterized 7 axitinic acid salts by powder diffraction data on the basis of the 7 axitinic acid formula compounds available as disclosed in patent WO2006048751a 1. Patent CN201510509413.7 discloses the preparation of a crystalline axitinib fumarate.

Due to the problems of photosensitivity, insolubility and the like of axitinib, the technicians in the field try to develop different crystal forms to obtain the axitinib crystal form more suitable for medicine. However, according to the current reports, from the aspects of bioavailability, stability, manufacturability and the like, only crystal form IV and crystal form XLI can be used in many disclosed axitinib crystal forms, and due to the extreme instability of light exposure of the crystal form IV, original research pfeiffei company finally selects the crystal form XLI with relatively small light exposure degradation amount as the crystal form on the market (visible CHMP evaluation report). However, as reported by CN200880016453, the potency of XLI in the market after light exposure is reduced to 89%, and in order to achieve the safety and effectiveness of the medicine, the preparation process adopting the shading process is still unavoidable. And a plurality of series of axitinib solvate crystal forms, axitinic acid salt crystal forms and axitinib new crystal forms which are developed and researched in the following have defects in the aspects of patent medicine safety, solubility, bioavailability or photostability and the like.

In conclusion, further research and development of advantageous crystalline forms of axitinib suitable for pharmaceutical use still remain problems to be solved at present.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a new medicinal salt crystal form of axitinib and a preparation method thereof.

The specific technical scheme of the invention is as follows:

an axitinib maleate crystal form is characterized in that the molar ratio of axitinib to maleic acid in the maleate crystal form is 1:1, two molecules of axitinib, two molecules of maleic acid and two molecules of water form a basic unit of the crystal form, and the specific structure is as shown in formula I:

preferably, the axitinib maleate crystal form has characteristic peaks at 7.68 +/-0.2 degrees, 13.52 +/-0.2 degrees, 17.89 +/-0.2 degrees, 18.54 +/-0.2 degrees, 19.79 +/-0.2 degrees, 20.23 +/-0.2 degrees, 26.02 +/-0.2 degrees by using Cu-Ka radiation and an X-ray diffraction spectrum expressed by 2 theta.

Preferably, the axitinib maleate crystal form has an X-ray diffraction spectrum shown by 2 theta using Cu-Ka radiation and has characteristic peaks at 7.38 +/-0.2 degrees, 7.68 +/-0.2 degrees, 12.90 +/-0.2 degrees, 13.52 +/-0.2 degrees, 15.28 +/-0.2 degrees, 17.89 +/-0.2 degrees, 18.54 +/-0.2 degrees, 19.79 +/-0.2 degrees, 20.23 +/-0.2 degrees, 20.81 +/-0.2 degrees, 21.27 +/-0.2 degrees, 21.44 +/-0.2 degrees, 25.67 +/-0.2 degrees, 26.02 +/-0.2 degrees, 27.27 +/-0.2 degrees and 27.71 +/-0.2 degrees.

Preferably, the crystalline form of axitinib maleate, using Cu-ka radiation, has characteristic peaks according to the X-ray powder diffraction pattern shown in figure 1.

Preferably, the crystalline form of axitinib maleate has the crystallographic parameters: monoclinic system, space group is P-1; the unit cell parameters are:

A preparation method of the axitinib maleate crystal form comprises the following steps:

dissolving the axitinib and maleic acid in a solvent A, heating and dissolving, performing temperature-controlled reflux reaction, cooling and crystallizing, filtering, washing, and drying to obtain the axitinib maleate crystal form.

Preferably, the solvent A is a mixed solvent of acid, alcohol and water, wherein the acid solution is preferably formic acid and acetic acid; the alcohol solution is preferably methanol, ethanol, or isopropanol.

Preferably, the volume ratio of the acid to the alcohol to the water in the solvent A mixed solvent is 1: 5-10: 1-5, preferably 1:8: 2.

Further, the solvent A is preferably one of formic acid/ethanol/water, formic acid/methanol/water, formic acid/isopropanol/water or a combination thereof.

Preferably, the feeding molar ratio of the axitinib to the maleic acid is 1: 1-2.5, preferably 1: 1.8.

Preferably, the mass-to-volume ratio of the axitinib to the solvent A is 3-8: 1, wherein the mass is mg and the volume is mL.

Preferably, the heating and dissolving temperature is 50-75 ℃.

Preferably, the temperature-controlled reflux reaction time is 4-10 hours.

Preferably, the cooling mode is program cooling, and the cooling rate is preferably 0.5-1 ℃/min.

Preferably, the temperature for cooling and crystallizing is 0-20 ℃; preferably 5 to 10 ℃.

The axitinib maleate crystal form can be used as an active ingredient and applied to preparation of antitumor drugs.

A pharmaceutical composition comprising the crystalline form of axitinib maleate according to the invention in admixture with other components.

Preferably, the pharmaceutical composition of the present invention is prepared as follows: the compounds of the present invention are combined with pharmaceutically acceptable solid or liquid carriers and optionally with pharmaceutically acceptable excipients using standard and conventional techniques to prepare useful dosage forms.

Preferably, the other components include other active ingredients, fillers, diluents, binders, disintegrants, lubricants, etc., which may be used in combination.

More preferably, the diluent is selected from one or more of starch, sucrose, dextrin, lactose, microcrystalline cellulose, mannitol and sorbitol; the adhesive is selected from one or more of methylcellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, sodium hydroxymethyl cellulose, ethyl cellulose and polyvidone; the disintegrant is selected from one or more of carboxymethyl starch sodium, low-substituted hydroxypropyl cellulose, croscarmellose sodium and crospovidone; the lubricant is selected from one or more of magnesium stearate, superfine silica gel powder, talcum powder and sodium dodecyl sulfate.

Preferably, the pharmaceutical composition is tablets, capsules, granules, pills and the like.

The invention has the beneficial effects that:

the axitinib maleate crystal form prepared by the invention is greatly improved in the aspects of stability, solubility, permeability and the like, and after the photostability investigation, the axitinib impurity is slightly increased, and the salt crystal form has good photostability. The preparation method of the axitinib maleate crystal form is simple, and the solvents used in the preparation process are all low-toxicity or non-toxic solvents, so that the preparation method is more suitable for industrial production; the obtained crystal has regular crystal form, uniform grain size, definite crystallography main parameters and exact atom space positions, and single crystal diffraction data shows that the crystal does not contain organic solvent, so that the non-solvate crystal form is safer for medicine use and is suitable for large-scale popularization and application.

Drawings

FIG. 1: crystalline form X-ray powder diffraction pattern of axitinib maleate.

FIG. 2 is a schematic diagram: ORTEP diagram of crystalline form of axitinib maleate.

FIG. 3: alitinib maleate crystal form stacking diagram

FIG. 4: a DSC-TGA chart of crystalline form of axitinib maleate.

Detailed Description

The invention is further illustrated by the following examples. It should be properly understood that: the examples of the present invention are intended to be illustrative only and not to be limiting, and therefore, the present invention is intended to be simply modified within the scope of the present invention as claimed.

Materials used in the experiment: axitinib is commercially available and can also be prepared by the method disclosed in patent WO 2006048745. The axitinib crystal form required by the comparative test can be prepared by referring to the prior art or can be purchased; all materials used in the other experiments, which do not have the indicated sources and specifications, are commercially available analytically pure or chemically pure.

Example 1

About 0.4g of axitinib, 0.20g of maleic acid were added to 90ml of formic acid/methanol/water (V)_{Formic acid}:V_Methanol:V_{Water (W)}Heating the mixed solution of 1:8:2) to 60-65 ℃ for dissolving, stirring and refluxing for 6 hours for reaction, cooling to 10 ℃ at the speed of 0.5 ℃/min, controlling the temperature to crystallize, filtering after crystallization, washing a filter cake with methanol, and drying to obtain the axitinib maleate crystal form with the purity of 99.62%.

Example 2

About 0.4g of axitinib, 0.12g of maleic acid were added to 50ml of formic acid/isopropanol/water (V)_{Formic acid}:V_{Isopropanol (I-propanol)}:V_{Water (I)}Heating the mixed solution of 1:5:1) to 50-60 ℃ for dissolving, stirring and refluxing for reaction for 4 hours, cooling to 10 ℃ at the speed of 0.5 ℃/min, controlling the temperature to crystallize, filtering after crystallization is finished, washing a filter cake with methanol, and drying to obtain the axitinib maleate crystal form with the purity of 99.54%.

Example 3

About 0.4g of axitinib, 0.29g of maleic acid were added to 130ml of acetic acid/ethanol/water (V)_{Acetic acid}:V_Ethanol:V_{Water (W)}Heating the mixed solution of 1:10:5) to 70-75 ℃ for dissolving, stirring and refluxing for 10 hours for reaction, cooling to 30 ℃ at the speed of 1 ℃/min, controlling the temperature for crystallization, filtering, washing filter cakes with methanol, and drying to obtain the crystalline form of axitinib maleate with the purity of 99.58%.

Example 4

About 0.4g axitinib, 0.20g maleic acid was added to 100ml formic acid/ethanol/water (V)_{Formic acid}:V_Ethanol:V_{Water (W)}Heating the mixed solution of 1:6:3) to 65-70 ℃ for dissolving, stirring, refluxing and reacting for 5 hours, cooling to 20 ℃ at the speed of 1 ℃/min, controlling the temperature to crystallize, filtering, washing filter cakes with methanol, and drying to obtain the axitinib maleate crystal form with the purity of 99.52%.

Alitinib maleate crystal form characterization

The X-ray powder diffraction test instrument and test conditions involved in the invention are as follows: x-ray powder diffractometer PANalytical EMPYREA; Cu-K alpha; a sample stage: a flat plate; the incident light path is BBHD; diffraction light path: PLXCEL; voltage 45kv and current 40 mA; a diverging slot 1/4; an anti-scatter slit 1; 0.04rad of cable pull slit; step length: 0.5 s; scanning range: 3 to 50 degrees. The corresponding characteristic peak in the X-ray secretion diffraction pattern (Cu-Ka) is shown in figure 1 and table 1.

Table 1 axitinib maleate crystal form PXRD peaks

The axitinib maleate crystal form provided by the invention is subjected to X-ray single crystal diffraction test analysis. The X-ray single crystal diffraction instrument and the test conditions related by the invention are as follows: the chemistry XtaLAB Synergy X-ray single crystal diffractometer measures the temperature 293(2) K, uses CuKa radiation, collects data in an omega scanning mode and carries out Lp correction. Analyzing the structure by a direct method, finding out all non-hydrogen atoms by a difference Fourier method, obtaining all hydrogen atoms on carbon and nitrogen by theoretical hydrogenation, and refining the structure by a least square method.

The crystallographic parameters obtained by testing and analyzing the crystalline form of axitinib maleate prepared by the invention are as follows: monoclinic system, space group is P-1; the unit cell parameters are:

ORTEP figure 2 of the crystalline form of axitinib maleate according to the invention shows that two molecules of axitinib bind two molecules of maleic acid and two molecules of water. The stacking diagram of the crystalline form of axitinib maleate according to the invention is shown in the attached figure 3.

Table 2 main crystallographic data for axitinib maleate crystal form

The TGA/DSC thermal analysis tester and the test conditions in the invention are as follows: TGA/DSC thermogram: METTLER TOLEDO TGA/DSC3 +; dynamic temperature section: 30-300 ℃; heating rate: 10 ℃/mIVn; segment gas N₂(ii) a Gas flow rate: 50 mL/mIVn; crucible: an aluminum crucible of 40. mu.l.

The TGA/DSC test result of the crystalline form IV of the new salt of axitinib and maleic acid prepared by the method is shown in figure 4, the DSC test result has two endothermic peaks, and the peak values correspond to the temperatures of 96.27 ℃ and 156.89 ℃.

The samples of examples 1 to 4 all had the same X-ray powder diffraction pattern, crystallographic parameters, DSC pattern.

Comparative example 1 preparation of axitinib mesylate, reference may be made to the following procedure:

adding about 0.25g of axitinib into 10ml of isopropanol, heating to 50 ℃, and stirring to dissolve; adding 126 mu l of methanesulfonic acid into 1ml of isopropanol to prepare methanesulfonic acid isopropanol solution; and (3) dropwise adding the methanesulfonic acid isopropanol solution into the axitinib isopropanol solution at the temperature of 50 ℃, sealing, stirring for 1 hour at the temperature of 50 ℃, cooling to room temperature, stirring overnight, filtering and drying to obtain the axitinib mesylate with the purity of 99.54%.

Comparative example 2 axitinib sulfate preparation, the following procedure can be referenced:

adding about 0.25g of axitinib into 5ml of isopropanol, heating to 50 ℃, and stirring to dissolve; adding 36 μ l sulfuric acid solution (with concentration of about 96%) into 0.5ml isopropanol to obtain sulfuric acid isopropanol solution; and (3) dropwise adding the isopropanol sulfate solution into the isopropanol axitinib solution at the temperature of 50 ℃, sealing, stirring for 1 hour at the temperature of 50 ℃, cooling to room temperature, stirring overnight, filtering and drying to obtain the axitinib sulfate with the purity of 99.48%.

Comparative example 3 preparation of axitinib fumarate, reference may be made to the following procedure:

adding about 1g of axitinib to 15ml of ethanol, and adding about 0.35g of fumaric acid while stirring; heating to 65-70 ℃, stirring for 1 hour, cooling to 25 ℃, crystallizing, filtering, and vacuum drying at 100-120 ℃ to obtain the axitinib fumarate with the purity of 99.45%.

Comparative example 4 preparation of crystalline XLI axitinib, reference is made to the following procedure:

adding about 4g of crude axitinib into 40ml of isopropanol, heating to 60 ℃, keeping for 3 hours, cooling to ambient temperature, filtering, separating solid, washing with about 12ml of isopropanol, purging with nitrogen for drying for 2 hours, and further drying in vacuum at 55-65 ℃ for 18 hours; and adding the solid into 40ml of absolute ethyl alcohol, heating and refluxing, distilling to remove the solvent about 1/3, continuously refluxing for 2 hours, cooling to room temperature, stirring for 1 hour, filtering, washing by about 12ml of absolute ethyl alcohol, and vacuum-drying the filter cake for 24 hours at 50-60 ℃ to obtain an XLI crystal form with the purity of 99.53%.

Comparative example 5 preparation of crystalline form XXV of axitinib, reference may be made to the following method:

adding about 2g of axitinib isopropanol solvate into 40ml of ethanol (denatured by 1% methanol), heating the slurry to 77-78 ℃ under the protection of nitrogen for 24 hours, cooling to room temperature, granulating for 1 hour, filtering, washing a filter cake by about 4ml of absolute ethanol, and drying the solid in vacuum at 50-55 ℃ for 16 hours to obtain axitinib XXV with the purity of 99.45%.

Comparative example 6 preparation of axitinib acetone solvate, reference may be made to the following procedure:

adding about 1g of axitinib into 40ml of N, N-dimethylformamide, heating to 50 ℃, stirring for dissolving, adding acetone (200ml), continuing to perform heat preservation and stirring for reaction for 2 hours, after the reaction is finished, filtering, reducing the filtrate to-10-0 ℃ at the speed of 0.5 ℃/min, stirring for crystallization, after the crystallization is finished, filtering, and drying to obtain an axitinib acetone solvate with the purity of 99.47%.

Verification of the examples:

the prepared axitinib crystal form is considered in the aspects of stability, solubility, permeability and the like, and the specific implementation contents are as follows:

it should be noted that, in 7 axitinic acid salt forms (benzenesulfonic acid, methanesulfonic acid, 4-chlorobenzenesulfonic acid, p-toluenesulfonic acid, hydrobromic acid, hydrochloric acid, sulfuric acid) prepared by the inventors by referring to the prior art method, the salt form with the best solubility is axitinib mesylate, the salt form with the best stability is axitinib sulfate, and the total impurity of other 6 salt forms except the axitinib sulfate form is higher than 10% after being subjected to photostability for 10 days.

Light stability test

The crystal forms prepared in example 1 and comparative examples 1-6 were respectively taken, stored under strong light irradiation (4500Lx ± 500Lx) at 25 ℃ (RH 45%), sampled for 5 days and 10 days respectively, and purity was checked by HPLC. The results are shown in Table 3.

TABLE 3 photostability test results for crystalline forms of axitinib

The light stability test result shows that the total impurity content of the axitinib crystal form XLI and the axitinib mesylate exceeds 5 percent after 10 days under the condition of strong light irradiation. The axitinib maleate crystal form prepared by the invention has good photostability. The examination found that examples 1-4 have similar stability test results.

Relative Humidity (RH) stability comparison

The axitinib crystal forms prepared in example 1 and comparative examples 1-6 are respectively taken, and PXRD detection is carried out after the axitinib crystal forms are stored at 25 ℃ for 1 week under different humidity conditions (25%, 60%, 75% and 95%), and the relative humidity stability of each crystal form is tested, and the results are shown in Table 4.

Table 4 axitinib crystal form relative humidity stability results

Note that: the storage condition is stable, and the PXRD spectrum is unchanged; the gamma group indicates instability under such storage conditions.

The Relative Humidity (RH) stability test result shows that the crystalline form of axitinib maleate is stable in relative humidity. The examination revealed that examples 1 to 4 had the same stability test results.

Solubility test

The test method comprises the following steps: the obtained axitinib prepared in example 1 and comparative examples 1 to 6 was added in excess to a medium comprising water and 0.01mol/L hydrochloric acid solution and pH6.8 PBS buffer, and stirred at 37 ℃ for 72 hours. Sampling is repeated for three times, filtering is carried out, a proper amount of filtrate is taken, dilution is carried out, and HPLC detection is adopted, so that the solubility in each medium is obtained.

TABLE 5 solubility of axitinib in different media (mg/ml)

Solubility test results show that compared with available crystal form XLI disclosed by the prior art, the axitinib maleate crystal form prepared by the invention has remarkably improved solubility. Examination revealed that examples 1-4 had similar solubility test results.

Permeability test

And (3) testing conditions are as follows: permeability tests were performed using the Franz diffusion cell method at water temperatures of (37 ± 0.5) ° c.

Dialysis membranes (model: MW 14000Da, Himedia, India): respectively treating with 10% sodium bicarbonate solution, 10MmEDTA solution, and deionized water at 70 deg.C for 20 min; the treated dialysis membrane was placed in a diffusion cell (effective surface area 4.15 cm)²) (ii) a The axitinib crystal forms (10 mg calculated by axitinib) prepared in example 1 and comparative examples 1-6 are respectively taken from a donor room and suspended in 2ml of distilled water; the receptor compartment was filled with phosphate buffer (pH 7.4), kept at room temperature, degassed, and magnetically stirred at 45 ± 5 RPM; the permeation cumulant was measured after 24 hours.

TABLE 6 cumulative osmotic amount of axitinib (mg/cm)²)

According to the permeability test results, the axitinib maleate crystal form permeability is obviously improved.

The axitinib maleate crystal form prepared by the invention has beneficial effects in the aspects of stability, solubility, permeability and the like, and the comprehensive performance of the axitinib maleate crystal form is remarkably improved compared with the axitinib crystal form reported in the prior art, so that the axitinib maleate crystal form is more suitable for being used in pharmaceutical preparations. The crystal form ORTEP of the axitinib maleate disclosed by the invention is free of organic solvents, is safer for medicinal use compared with an axitinib solvate, and is more suitable for medicinal preparations.

Claims

1. An axitinib maleate crystal form, characterized in that the molar ratio of axitinib to maleic acid in the maleate crystal form is 1:1.

2. The crystalline form of axitinib maleate according to claim 1, wherein the basic unit of the crystalline form of maleate consists of two molecules of axitinib, two molecules of maleic acid, two molecules of water, and the crystallographic parameters are: monoclinic system, space group is P-1; the unit cell parameters are:

The structure is as follows:

3. the crystalline form of axitinib maleate according to claim 1, wherein said crystalline form has an X-ray diffraction pattern, in terms of 2 Θ, using Cu-ka radiation having characteristic peaks at 7.68 ± 0.2 °, 13.52 ± 0.2 °, 17.89 ± 0.2 °, 18.54 ± 0.2 °, 19.79 ± 0.2 °, 20.23 ± 0.2 °, 26.02 ± 0.2 °.

4. The crystalline form of axitinib maleate according to claim 1 having an X-ray diffraction pattern, expressed in 2 Θ using Cu-ka radiation, characterized by peaks at 7.38 ± 0.2 °, 7.68 ± 0.2 °, 12.90 ± 0.2 °, 13.52 ± 0.2, 15.28 ± 0.2, 17.89 ± 0.2 °, 18.54 ± 0.2 °, 19.79 ± 0.2 °, 20.23 ± 0.2 °, 20.81 ± 0.2 °, 21.27 ± 0.2 °, 21.44 ± 0.2 °, 25.67 ± 0.2 °, 26.02 ± 0.2 °, 27.27 ± 0.2 °, 27.71 ± 0.2 °.

5. The crystalline form of axitinib maleate according to claim 1, wherein said crystalline form has an X-ray powder diffraction pattern as shown in figure 1.

6. A process for preparing the crystalline form of axitinib maleate according to any of claims 1 to 5, characterized in that it comprises the following steps: dissolving axitinib and maleic acid in a solvent A, heating for dissolving, performing temperature-controlled reflux reaction, and cooling for crystallization to obtain the axitinib maleate crystal form.

7. The method for preparing a crystalline form of axitinib maleate according to claim 6, wherein the molar ratio of axitinib to maleic acid is 1: 1-2.5.

8. The preparation method of the crystalline form of axitinib maleate according to claim 6, wherein the solvent A is a mixed solvent of acid, alcohol and water, preferably one or a combination of formic acid/ethanol/water, formic acid/methanol/water, formic acid/isopropanol/water, acetic acid/ethanol/water, acetic acid/methanol/water and acetic acid/isopropanol/water.

9. The method for preparing a crystalline form of axitinib maleate according to claim 6, wherein the heated dissolution temperature is 50 to 75 ℃; the cooling crystallization temperature is 0-20 ℃; the cooling mode is program cooling, and the cooling rate is 0.5-1 ℃/min.

10. Use of the crystalline form of axitinib maleate according to any of claims 1 to 5 as active ingredient for the preparation of an antitumor medicament.