Abstract: A gas permeable culture flask and method for culturing mammalian cells wherein a gas permeable insert is provided in the flask to allow rapid and uniform equilibration of gases between the atmosphere of the culture flask and the atmosphere of the incubator into which the flask is placed for culturing. The size of the gas permeable insert relative to the overall surface area of the flask is limited to allow the flask to be removed from the incubator for observation, testing and culture treatment for relatively long times without substantial changes to the flask atmosphere. Alternatively, removable covers are provided for occluding passage of gases through the gas permeable insert when the flask is removed from the controlled atmosphere of the incubator.

Abstract: Methods and compositions for detecting the presence of tumors are provided, where a physiological sample is assayed for the expression product of a c-onc gene as diagnostic for the presence of the tumor. The method finds use in both pre- and postoperative situations with a host suspected of having transformed malignant cells.

Abstract: Methods and compositions are provided for gene transfer to intact mammals with expression of the exogenous genetic material in the host. Mammalian host cells which are regenerative, normally highly proliferative or subject to induced proliferation, are transformed or modified in vitro with DNA capable of replication and expression in the host cell, wherein the DNA becomes incorporated into the cell. The modified cells are found to regenerate in the host with expression of the introduced DNA. Particularly, mammalian cells were modified with genes providing for overproduction of a particular enzyme. The modified cells were reintroduced in the host under conditions providing for selective advantage of the modified cells.

Abstract: Methods and compositions are provided for gene transfer to intact mammals with expression of the exogenous genetic material in the host. Mammalian host cells which are regenerative, normally highly proliferative or subject to induced proliferation, are transformed or modified in vitro with DNA capable of replication and expression in the host cell, wherein the DNA becomes incorporated into the cell. The modified cells are found to regenerate in the host with expression of the introduced DNA. Particularly, mammalian cells were modified with genes providing for overproduction of a particular enzyme. The modified cells were reintroduced in the host under conditions providing for selective advantage of the modified cells.

Abstract: Methods and compositions for detecting the presence of tumors are provided, where a physiological sample is assayed for the expression product of a c-onc gene as diagnostic for the presence of the tumor. The method finds use in both pre-and postoperative situations with a host suspected of having transformed malignant cells.