Method for removing tumor cells from tumor cell-contaminated stem cell products

Abstract

Methods and apparatus for removing tumor cells from tumor cell-contaminated stem cells products are disclosed. In one embodiment, the method relies on an in-line filtration device that includes a tumor cell reduction filter means, preferably comprised of one or more tumor cell reduction filter pads. Preferably, the tumor cell reduction filter means provides at least a ten-fold reduction in filter cells while allowing for at least a 30% recovery of stem cells in a filtered stem cell product.

We claim:  
     
         1 . A method for removing tumor cells from a tumor cell-contaminated stem cell product, comprising the steps of: 
 (a) providing an in-line filtration device including: 
 a housing having an inlet port and an outlet port therein; and  
 a tumor cell reduction filter means disposed within said housing between the inlet port and the outlet port so as to filter tumor cell-contaminated stem cell products which flow into the filtration device via the inlet port, said tumor cell reduction filter means dividing said housing into a first chamber and a second chamber;  
   (b) providing a tumor cell-contaminated stem cell product;    (c) passing the tumor cell-contaminated stem cell product through the filtration device wherein tumor cells are retained by the tumor cell reduction filter means within the filtration device and the stem cell product passes through the tumor cell reduction filter means and out of the filtration device; and    (d) recovering a tumor cell-depleted stem cell product.    
     
     
         2 . The method of    claim 1    wherein the filtration device further includes means, disposed within the filtration device, for allowing gases to vent from the filtration device through the outlet port.  
     
     
         3 . The method of    claim 1    wherein the filter means provides at least a ten-fold reduction in tumor cells and at least a 30% recovery of stem cells in the tumor cell-depleted stem cell product.  
     
     
         4 . The method of    claim 3    wherein the filter means provides a stem cell product flow rate of at least 50 mL per hour.  
     
     
         5 . The method of    claim 3    wherein the filter means comprises one or more tumor cell reduction filter pads.  
     
     
         6 . The method of    claim 3    wherein the filter means has an air permeability of at least about 750 L/min.  
     
     
         7 . The method of    claim 6    wherein the filter means has an air permeability of at least about 3.3×10 3  L/min.  
     
     
         8 . The method of    claim 1    wherein the tumor cell-contaminated stem cell product comprises a stem cell product contaminated with tumor cells selected from the group consisting of ovarian cancer cells, testicular cancer cells, breast cancer cells, multiple myeloma cells, non-Hodgkin's lymphoma cells, chronic myelogenous leukemia cells, chronic lymphocytic leukemia cells, acute myeloid leukemia cells, and acute lymphocytic leukemia cells.  
     
     
         9 . The method of    claim 1    wherein the tumor cell-contaminated stem cell product comprises a stem cell product contaminated with tumor cells selected from the group consisting of ductal carcinoma cells and adenocarcinoma cells.  
     
     
         10 . A tumor cell reduction filter means suitable for use in an in-line filtration device, the tumor cell reduction filter means comprising a mechanically stable substrate that provides at least a ten-fold reduction in tumor cells and at least a 30% recovery of stem cells in a filtered stem cell product.  
     
     
         11 . The filter means of    claim 10    further characterized in that the filter means provides a stem cell product flow rate of at least 50 mL per hour.  
     
     
         12 . The filter means of    claim 10    further characterized in that the filter means comprises one or more tumor cell reduction filter pads having a web matrix construction comprised of a plurality of fibers and fibrils.  
     
     
         13 . The filter means of    claim 12    wherein the fibers are formed from polyester having a denier of about 1.5 mm and the fibrils are formed of cellulose.  
     
     
         14 . The filter means of    claim 10    further characterized in that the filter means has an air permeability of at least about 750 L/min.  
     
     
         15 . The filter means of    claim 14    further characterized in that the filter means has an air permeability of at least about 3.3×10 3  L/min.  
     
     
         16 . An apparatus suitable for use as a filtration device for removing tumor cells from a tumor cell-contaminated stem cell product, the filtration device comprising: 
 a housing having an inlet port and an outlet port therein; and    a tumor cell reduction filter means disposed within the housing between the inlet port and the outlet port so as to filter tumor cell-contaminated stem cell products which flow into the housing via the inlet port, the filter means dividing said housing into a first chamber and a second chamber.    
     
     
         17 . The filtration device of    claim 16    further including means, disposed within the housing, for allowing gases to vent from the housing through the outlet port.  
     
     
         18 . The filtration device of    claim 16    wherein the filter means provides at least a ten-fold reduction in tumor cells and at least a 30% recovery of stem cells in a filtered stem cell product.  
     
     
         19 . The filtration device of    claim 18    wherein the filter means provides a stem cell product flow rate of at least 50 mL per hour.  
     
     
         20 . The filtration device of    claim 18    wherein the filter means comprises one or more tumor cell reduction filter pads.  
     
     
         21 . The filtration device of    claim 18    wherein the filter means has an air permeability of at least about 750 L/min.  
     
     
         22 . The filtration device of    claim 21    wherein the filter means has an air permeability of at least about 3.3×10 3  L/min.