This invention provides, and in certain specific but non-limiting aspects relates to: assays that can be used to predict whether a given ISV will be subject to protein interference as described herein and/or give rise to an (aspecific) signal in such an assay (such as for example in an ADA immunoassay). Such predictive assays could for example be used to test whether a given ISV could have a tendency to give rise to such protein interference and/or such a signal; to select ISV's that are not or less prone to such protein interference or to giving such a signal; as an assay or test that can be used to test whether certain modification(s) to an ISV will (fully or partially) reduce its tendency to give rise to such interference or such a signal; and/or as an assay or test that can be used to guide modification or improvement of an ISV so as to reduce its tendency to give rise to such protein interference or signal;methods for modifying and/or improving ISV's to as to remove or reduce their tendency to give rise to such protein interference or such a signal;modifications that can be introduced into an ISV that remove or reduce its tendency to give rise to such protein interference or such a signal; ISV's that have been specifically selected (for example, using the assay(s) described herein) to have no or low(er)/reduced tendency to give rise to such protein interference or such a signal; modified and/or improved ISV's that have no or a low(er)/reduced tendency to give rise to such protein interference or such a signal.

Affinity ligands useful for mild elution affinity chromatography, including affinity ligands specific for immunoglobulins M, A, and E, are disclosed as are method of identifying and using such affinity ligands.

The invention provides multispecific antibodies and methods of making and using such antibodies.

The compositions and methods provide herein include, inter alia, antibodies attached to single-stranded oligoribonucleotides. Two antibodies are capable of forming complexes in vivo through hybridization of the respective complementary oligoribonucleotides they are bound to. For example, a first antibody bound to a first oligoribonucleotide through a first chemical linker may be administered to a subject, bind to a cell surface antigen in vivo and subsequently form an antibody complex in vivo with a second antibody bound to a second oligoribonucleotide through a second chemical linker, through complementary base-pairing between the first and the second oligoribonucleotide. The compositions and methods provided herein are, inter alia, useful for diagnostic and therapeutic purposes, for example, the treatment of cancer or autoimmune disease.

The present disclosure provides hypoimmunogenic biotherapeutic compositions that suppress the development of an immune response to themselves in an individual. The present disclosure also provides pharmaceutical compositions that include such hypoimmunogenic biotherapeutics, methods for making such hypoimmunogenic biotherapeutics, and methods for using such hypoimmunogenic biotherapeutics as therapeutics and in research.

In certain aspects, the disclosure relates to anti-idiotype antibodies and antigen-binding portions thereof that specifically bind a GP5B83 containing protein, e.g., an antibody or antigen-binding portions thereof. In some aspects, the anti-idiotype antibodies and antigen-binding portions of the present disclosure can be used in methods to detect and quantify cells expressing chimeric antigen receptors that include GP5B83.

This invention pertains to pharmaceutical compositions comprising a glucocorticoid for use in the treatment of diseases by immunoablation. The compositions of the invention may be for use in the treatment of diseases that are mediated by immune cells such as lymphocytes.

The present invention relates to antibodies targeting the membrane bound IgM (mIgM) of the B-cell receptor complex found in B-cell lymphomas and leukemias and uses thereof. Another aspect of the present invention is the use of anti-B-Cell mIgM antibodies in the treatment of Be-cell malignancies, including B-cell lymphomas and leukemias.

The present invention relates to methods for separating target cells from non-target cells using immunorosettes and magnetic particles. The method involves contacting a sample containing target cells and secondary targets such as erythrocytes with an antibody composition which allows immunorosettes of the target cells and the secondary targets to form. The sample is subsequently contacted with a second antibody composition which allows the binding of magnetic particles to the formed immunorosettes and free secondary targets. The immunorosettes and secondary targets labeled with magnetic particles are separated from non-target cells using a magnetic field. The antibody composition optionally contains bifunctional antibodies or tetrameric antibody complexes.

The invention provides a tandemly repeated protein comprising at least two repeats of an amino acid sequence of an antibody binding protein or a fragment thereof and a cell having the repeats expressed on the membrane thereof, which can be used in immunoassay to improve detection sensitivity and detection limit.