Patent Abstract:
a method of stabilizing and potentiating action of molecules of known anti - angiogenic substances such as angiostatin ® or endostatin ® by using in coupling conjugation with cis - unsaturated fatty acids in the treatment of cell proliferative disorders uses c - ufas chosen from linoleic acid , gamma - linolenic acid , dihomo - gamma - linolenic acid , arachidonic acid , alpha - linolenic acid , eicosapentaenoic acid , docosahexaenoic acid and cis - parinaric acid in predetermined quantities . preferably , the c - ufas are in the form of polyunsaturated fatty acids . uncontrolled or undesirable angiogenic activity promotes cell proliferative disorders and tumor growth , which can be inhibited by the selective use of pufas with anti - angiogenic substances used selectively in conjunction with predetermined anti - cancer drugs . for treatment of glioma , a sodium salt of a pufa is preferred to form an admixture with an anti - angiogenic substance and a selected anti - cancer drug . for a non - glioma type of cell proliferation disorder , a sodium , potassium or lithium salt of a pufa is preferred to form an admixture with an anti - angiogenic substance . anti - angiogenic substances envisaged in this invention include angiostatin ®, endostatin ®, platelet factor - 4 , tnp - 470 , thalidomide , interleukin - 12 and metalloproteinase inhibitors . a preferred method of administration of the mixture to treat a tumor is intra - arterial administration into an artery which provides the main blood supply for the tumor .

Detailed Description:
fig1 shows a typical known metabolism pattern of essential fatty acids as known in prior art . essential fatty acids are precursors of eicosanoids and are important structural components of cell membranes . they also provide the substrates for the generation of lipid peroxidation products which have an inhibitory action on cell proliferation . tumor cells are known to have low delta - 6 - desaturase activity , an enzyme necessary for the desaturation of dietary linoleic acid ( la , 18 : 2 , n - 6 ) and alpha - linolenic acid ( ala , 18 : 3 , n - 3 ) to their respective products . in an earlier study , the inventor has shown that hepatocarcinogens , diethylnitrosamine ( den ) and 2 - acetylaminofluorine ( 2 - aaf ), can suppress the activity of delta - 6 - desaturase and delta - 5 - desaturase resulting in low levels of gamma - linolenic acid ( gla , 18 : 3 , n - 6 ) and arachidonic acid ( aa , 20 : 4 , n - 6 ) and eicosapentaenoic acid ( epa , 20 : 5 , n - 3 ) and docosahexaenoic acid ( dha , 22 : 6 , n - 3 ) in the tumor cells . these results led the inventor and others to study the effect of various fatty acids on the survival of tumor cells in vitro . addition of efas ( la and ala ) and other pufas such as gla , dgla , aa , epa , dha and cis - parinaric acid to a variety of tumor cells in vitro showed that only tumor cells are killed by these fatty acids without harming the normal cells . this selective tumoricidal action of fatty acids seems to be mediated by free radicals and lipid peroxides . similar to these fatty acids , radiation , some anfi - cancer drugs and cytokines ( lymphokines ) also seem to have the ability to generate free radicals in tumor cells and thus , bring about their tumoricidal actions . since drug resistance is a major obstacle in the clinical treatment of cancer and as pufas have selective tumoricidal action , the inventor studied the effects of pufas on drug - resistant tumor cells and their modulating influence on the actions of anti - cancer drugs . in the above context , in addition to producing reversal of tumor cell drug resistance by the administration of polyunsaturated fatty acids , it is seen from the invention that the manner of targeting the cancerous tissue is very critical to the efficacy and the speed with which necrosis can be brought about . more particularly , it is realized through this invention that by delivering a chosen admixture of salts of predetermined polyunsaturated fatty acidg and predetermined anti - angiogenic substance ( s ) to the tumor site intra - arterially , intra - venously , subcutaneously , intra - peritoneally or by by direct injection into the tumor bed , a very beneficial and hitherto unknown effect in terms of inhibiting blood supply to the tumor site and inducing tumor cell lysis is achieved simultaneously . in clinical studies conducted by the inventor with pufas , the inhibition of blood supply was pronounced enough to cause cutting off blood supply to the tumor site with very little time lag . in other instances , an unmistaken strangling of blood supply to the tumor region was observed , but was relatively gradual . one aspect of the invention consists in the preparation of a combination / composition of treatment of cancer in which one or more of la , gla , dgla , aa , ala , epa , dha and cis - parinaric acid are administered with conventional anti - cancer angents / drugs including anti - angiogenic protein / peptide with or without an oily lymphographic agent or any other suitable agent for the delivery of these compounds ; optionally , radiation may be included . the pufas may be provided in a daily dose of 0 . 5 mg to 50 gm together with appropriate doses of conventional anti - cancer drugs such as vincristine , doxorubicin , l - asparaginase , cis - platinum , busulfan , etc ., in a daily / weekly / monthly dose of 1 mg to 50 gm depending on the requirement and the stage of the disease and as may be determined from time to time with or without the addition of anti - angiogenic protein / peptide such as angiostatin ®/ endostatin ® in a dose of 1 mg to 100 mg / kg of body weight per day . the word anti - angiogenic substance is one or more of the following substances : angiostatin ®, endostatin ®, platelet factor - 4 , tnp - 470 , thalidomide , interleukin - 12 , metalloprotease inhibitors ( mmp ), anti - adhesion molecules ( in their desired dose ). the combination of pufas , conventional anti - cancer drugs , anti - angiogenic substances and the oily lymphographic agent may be administered by any one or different routes at the same time or at different times and intervals by selecting an appropriate route for each administration or in combination , eg . oral , parenteral including intra - arterial infusion , intravenous , subcutaneous , intra - peritoneal , topical , anal , vaginal routes as suppositories , or local injection directly into the tumor bed under the guidance of appropriate equipment such as but not limited to radiological guidance ( x - rays ), ct guidance or mri guidance or by stereostaxic guidance . the daily dose ( s ) of these compounds may not exclude the administration of long acting preparations or depot preparation once or more times in a day , week , month or at some other appropriate time interval as determined from time to time depending on the necessity . the fatty acids ( pufas ) may be present in any physiologically acceptable form including but not limited to glycerides , esters , free acids , amides , phospholipids or salts . the conventional anti - cancer drugs may be administered by themselves or in conjugation with pufas ( either alone orin combination such as gla alone or gla + aa , la , dgla , ala , epa or dha ). similarly the anti - angiogenic substance ( s ) may be given by themselves or in conjugation with pufas . for intra - arterial infasion or intravenous / subcutaneous injection / infusion or administration of la , gla , dgla , aa , ala , epa , dha and / or cis - parinaric acid these may be given by themselves or in combination or dissolved or conjugated in / with anti - angiogenic substances and in any other suitable solution that can be given parenterally but not limited to them . all these pufas , conventional anti - cancer drugs , anti - angiogenic substances and lyrnphographic agent may each be given alone or in combination thereof or all together or separately at the same time or at different time intervals on the same day / week / month either by same route or different routes as the situation demands . in order to observe or ascertain and record progress made in patients after administration of admixture according to this invention , images of the affected area eg ., tumor region before and after treatment can be obtained by various known modalities such as computerized axial tomography ( ct ), magnetic resonance imaging ( mri ), etc . 1 . hard ( wherein the pufas have been microencapsulated ) or soft gelatin capsules ( wherein the fatty acids are present in an oily form ) made by accepted normal or forms or methods and are administered to persons suffering from cancer in conjunction with conventional anti - cancer drugs and / or anti - angiogenic substances in the doses as stated supra . 2 . hard or soft gelatin capsules made by conventional methods , in which the fatty acids , the anti - cancer drugs and anti - angiogenic substances re incorporated together in the same capsule and are administered to persons suffering from cancer . 3 . as intra - tumoral preparation in appropriate doses ( from 0 . 5 mg to 50 mg per day ) of pure la , gla , dgla , aa , ala , epa and dha either individually or in combination thereof especially with anti - angiogenic substances for the treatment of human brain gliomas or any other accessible tumor ( eg . urinary bladdercancer , carcinoma of the esophagus , carcinoma of the lung , breast cancer etc .) by any route by using flexible fiber optic scopes such as bronchoscope , urethroscope , hysteroscope , etc . in the case of tumors of the head and neck the fatty acids are administered either by direct intra - tumoral route or by selective catheterization of the tumor feeding vessel ( s ) either by femoral , brachial or carotid routes or by subcutaneous route or intravenous route . the pufas and anti - angiogenic substances can be given to these patients daily , weekly or monthly or as and when necessary depending on the requirement and response of the patient to the treatment . 4 . administered as selective intra - arterial infusion or injection into the tumor feeding vessel by femoral , brachial or carotid routes or any other suitable route or in a combination thereof the pufas either alone or in combination with anti - cancer drugs / anti - angiogenic substances with or without the oily lymphographic agent or any other suitable agent all in a mixture or in conjugated form ( s ) ( like gla + any conventional anti - cancer drug or drugs + anti - angiogenic substance , la / gla / dgla / aa / ala / epa / dha / cis - parinaric acid all individually or in combination thereof + conventional anti - cancer drug ( s )+ anti - angiogenic substance ( s )+ lymphographic agent ., la / gla / dgla / aa / ala / epa / dha / cis - parinaric acid in combination with or conjugated to anti - angiogenic substance ( s ) or emulsified with or mixed with oily lymphographic agent ., la / gla / dgla / aa / ala / epa / dha / cis - parinaric acid alone or in combination thereof in oily lymphographic agent as a mixture or emulsion or as a conjugate ( s ) and a variety of other combinations thereof ). this preparation may be administered daily , weekly or monthly or at some other appropriate time interval . 5 . topical preparation of pufas either alone or in combination thereof with conventional anti - cancer drugs or anti - angiogenic substance ( s ) in a suitable delivery vehicle in which daily doses ( ranging from 0 . 5 μg to 100 mg ) are applied to primary skin cancers including kaposi &# 39 ; s sarcoma locally and / or conventional anti - cancer drugs are given either orally or parenterally . by the different embodiments of the invention method described supra , it becomes known that : ( i ) when pufas or cis - efas ( essential fatty acids described here are also called as cis - fatty acids as by virtue of their structure are referred to as cis - efas as they are in cis - configuration ) are admnistered to patients intra - arterially or even otherwise as a combination with anti - angiogenic substance ( s ), there are less chances of albumin and other protiens binding to the fatty acids . consequently , pufas thus administered using the invention are better available to be taken up by the tumor cells . ( ii ) owing to the efficient transportation of pufas to the tumor site as described hereinbefore , there is increased intensity of the cytotoxic action of pufas and the administered anti - cancer agents ( drugs or anti - angiogenic substance ( s ) or a combination thereof ). thus , using the invention , there is relatively better augmentation of free radical generation and lipid peroxidation in the tumor cells , thereby facilitating a greater degree of necrosis . ( iii ) inhibiting blood supply to the tumor region by the method of the invention prevents cell proliferation in the tumor region , thus enabling healthy tissue to grow back into place . ( iv ) the inhibition otherwise caused by vitamin e and superoxide dismutase to free radical generation and lipid peroxidation produced by pufas , is reduced in the method of this invention because of the manner of transportation of pufas to the tumor site in combination with anti - angiogenic substance ( s ) intra - arterially through a proximate artery or intravenously or subcutaneously . it is also within the purview of this invention , as stated supra to administer an admixture of pufas , anti - cancer drugs , and selected anti - angiogenic substance ( s ) at the same time , administering predetermined doses of pufas orally . all such variations are envisaged to be within the ambit of this invention . application to mammals : even though the examples described supra relate to humans , it is envisaged that the method of inhibiting blood supply and using admixture of this invention including an anti - angiogenic substance are equally applicable to other mammals . while this invention has been particularly shown and described with references to preferred embodiments thereof , it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims . also sodium and potassium salts are considered equivalents of each other . imaging techniques referred to herein are intended to include cat , mri , x - rays and other possible imaging methods . those skilled in the art will recognize or be able to ascertain using no more than routine experimentation , many equivalents to the specific embodiments of the invention described specifically herein . such equivalents are intended to be encompassed in the scope of the appended claims . 1 . battegay e j . angiogenesis : mechanistic insights , neovascular diseases , and therapeutic prospects . j mol med 1995 ; 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