The authors want to thank Ms. Cornelia Heis for her excellent technical assistance in immunohistochemistry and preparation of chicken embryos. This work was supported by the Austrian Science Fund (FWF Grant No. P19552) and the European Union (EU FP7 project Optatio No: 278570).

According to the Austrian law, and the Office of Laboratory Animal Welfare of the US public health service avian embryos are not considered as live vertebrate animals until hatching.The NIH Office of Laboratory Animal Welfare has provided written guidance in this area (http://www.grants.nih.gov/grants/olaw/references/ilar91.htm and NIH Publication No.: 06-4515).
1. Cell Culture and Lentiviral Transfection
<ol>
	<li>Culture MM cell lines OPM-2, RPMI-8226 and human mesenchymal stem cells from bone marrow in RPMI16...

<ol>
	<li>Kuehl, W. M., Bergsagel, P. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multiple+myeloma:+evolving+genetic+events+and+host+interactions.">Multiple myeloma: evolving genetic events and host interactions.</a> Nat.Rev.Cancer. 2 (3), 175-187 (2002).</li><li>Kumar, S. K., Gertz, M. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Risk+adapted+therapy+for+multiple+myeloma:+back+to+basics.">Risk adapted therapy for multiple myeloma: back to basics.</a> Leuk.Lymphoma. , (2014).</li><li>Prideaux, S. M., Conway, O. E., Chevassut, T. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+genetic+architecture+of+multiple+myeloma.">The genetic architecture of multiple myeloma.</a> Adv.Hematol. 2014, 864058 (2014).</li><li>Chauhan, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+orally+active+proteasome+inhibitor+ONX+0912+triggers+in+vitro+and+in+vivo+cytotoxicity+in+multiple+myeloma.">A novel orally active proteasome inhibitor ONX 0912 triggers in vitro and in vivo cytotoxicity in multiple myeloma.</a> Blood. 116 (23), 4906-4915 (2010).</li><li>Kuehl, W. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mouse+models+can+predict+cancer+therapy.">Mouse models can predict cancer therapy.</a> Blood. 120 (2), 238-240 (2012).</li><li>Nefedova, Y., Gabrilovich, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mechanisms+and+clinical+prospects+of+Notch+inhibitors+in+the+therapy+of+hematological+malignancies.">Mechanisms and clinical prospects of Notch inhibitors in the therapy of hematological malignancies.</a> Drug Resist.Updat. 11 (6), 210-218 (2008).</li><li>Yaccoby, S., Barlogie, B., Epstein, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Primary+myeloma+cells+growing+in+SCID-hu+mice:+a+model+for+studying+the+biology+and+treatment+of+myeloma+and+its+manifestations.">Primary myeloma cells growing in SCID-hu mice: a model for studying the biology and treatment of myeloma and its manifestations.</a> Blood. 92 (8), 2908-2913 (1998).</li><li>Dazzi, F., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Normal+and+chronic+phase+CML+hematopoietic+cells+repopulate+NOD/SCID+bone+marrow+with+different+kinetics+and+cell+lineage+representation.">Normal and chronic phase CML hematopoietic cells repopulate NOD/SCID bone marrow with different kinetics and cell lineage representation.</a> Hematol.J. 1 (5), 307-315 (2000).</li><li>Lock, R. B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+nonobese+diabetic/severe+combined+immunodeficient+(NOD/SCID)+mouse+model+of+childhood+acute+lymphoblastic+leukemia+reveals+intrinsic+differences+in+biologic+characteristics+at+diagnosis+and+relapse.">The nonobese diabetic/severe combined immunodeficient (NOD/SCID) mouse model of childhood acute lymphoblastic leukemia reveals intrinsic differences in biologic characteristics at diagnosis and relapse.</a> Blood. 99 (11), 4100-4108 (2002).</li><li>Feuring-Buske, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Improved+engraftment+of+human+acute+myeloid+leukemia+progenitor+cells+in+beta+2-microglobulin-deficient+NOD/SCID+mice+and+in+NOD/SCID+mice+transgenic+for+human+growth+factors.">Improved engraftment of human acute myeloid leukemia progenitor cells in beta 2-microglobulin-deficient NOD/SCID mice and in NOD/SCID mice transgenic for human growth factors.</a> Leukemia. 17 (4), 760-763 (2003).</li><li>Pearce, D. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=AML+engraftment+in+the+NOD/SCID+assay+reflects+the+outcome+of+AML:+implications+for+our+understanding+of+the+heterogeneity+of+AML.">AML engraftment in the NOD/SCID assay reflects the outcome of AML: implications for our understanding of the heterogeneity of AML.</a> Blood. 107 (3), 1166-1173 (2006).</li><li>Li, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Combined+inhibition+of+Notch+signaling+and+Bcl-2/Bcl-xL+results+in+synergistic+antimyeloma+effect.">Combined inhibition of Notch signaling and Bcl-2/Bcl-xL results in synergistic antimyeloma effect.</a> Mol.Cancer Ther. 9 (12), 3200-3209 (2010).</li><li>Tassone, P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+clinically+relevant+SCID-hu+in+vivo+model+of+human+multiple+myeloma.">A clinically relevant SCID-hu in vivo model of human multiple myeloma.</a> Blood. 106 (2), 713-716 (2005).</li><li>Ranga, A., Gjorevski, N., Lutolf, M. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drug+discovery+through+stem+cell-based+organoid+models.">Drug discovery through stem cell-based organoid models.</a> Adv.Drug Deliv.Rev. 69-70, 19-28 (2014).</li><li>Pereira, R. F., Barrias, C. C., Granja, P. L., Bartolo, P. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Advanced+biofabrication+strategies+for+skin+regeneration+and+repair.">Advanced biofabrication strategies for skin regeneration and repair.</a> Nanomedicine.(Lond). 8 (4), 603-621 (2013).</li><li>Fischbach, C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Engineering+tumors+with+3D+scaffolds).">Engineering tumors with 3D scaffolds).</a> Nat.Methods. 4 (10), 855-860 (2007).</li><li>Boulland, J. L., Halasi, G., Kasumacic, N., Glover, J. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Xenotransplantation+of+human+stem+cells+into+the+chicken+embryo.">Xenotransplantation of human stem cells into the chicken embryo.</a> J.Vis.Exp. (41), (2010).</li><li>Deryugina, E. I., Quigley, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chapter+2.+Chick+embryo+chorioallantoic+membrane+models+to+quantify+angiogenesis+induced+by+inflammatory+and+tumor+cells+or+purified+effector+molecules.">Chapter 2. Chick embryo chorioallantoic membrane models to quantify angiogenesis induced by inflammatory and tumor cells or purified effector molecules.</a> Methods Enzymol. 444, 21-41 (2008).</li><li>Deryugina, E. I., Quigley, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chick+embryo+chorioallantoic+membrane+model+systems+to+study+and+visualize+human+tumor+cell+metastasis.">Chick embryo chorioallantoic membrane model systems to study and visualize human tumor cell metastasis.</a> Histochem.Cell Biol. 130 (6), 1119-1130 (2008).</li><li>Kern, J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=GRP-78+secreted+by+tumor+cells+blocks+the+antiangiogenic+activity+of+bortezomib.">GRP-78 secreted by tumor cells blocks the antiangiogenic activity of bortezomib.</a> Blood. 114 (18), 3960-3967 (2009).</li><li>Ribatti, D., Nico, B., Vacca, A., Presta, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+gelatin+sponge-chorioallantoic+membrane+assay.">The gelatin sponge-chorioallantoic membrane assay.</a> Nat.Protoc. 1 (1), 85-91 (2006).</li><li>Ribatti, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+chick+embryo+chorioallantoic+membrane+as+a+model+for+tumor+biology.">The chick embryo chorioallantoic membrane as a model for tumor biology.</a> Exp.Cell Res. , (2014).</li><li>Dohle, D. 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The authors have no competing financial interests

The development of new therapeutic agents for refractory MM requires less time consuming and expensive in-vivo systems to evaluate sensitivity of human MM cells to drugs. Hitherto, only few in-vivo systems are available for the preclinical evaluation of new anti-myeloma therapies. All of them have their limitations for large scale screening of compound libraries 29.&#160; 
 
The best current models for human MM cells are highly immune-deficient mice 7,13,30 and turkey embryos 29...

Multiple myeloma (MM) is characterized by proliferation of malignant plasma cells in the bone marrow, bone lesions and immunodeficiency 1. Although new treatment options such as proteasome inhibitors (bortezomib) and immune modulatory drugs (pomalidomide and lenalidomide) are available, MM still remains an incurable malignancy with a grim prognosis 2. The bad prognosis might be explained by the extraordinary heterogeneity of MM cell clones that contributes to variable responses to therapy, in particular under long time treatment and selection pressure of MM clones 3.
Preclinical testing of new drugs and their combinations in vitro and in vivo is a critical and time-consuming step for future drug development. Thus, useful in-vivo models of MM are required to gain a better understanding of the biology of the disease and to enable the discovery of new drugs. Actually, the best xenotransplantation models for hematological malignancies and therapeutics are immune-deficient mice, such as the severe-combined immunodeficient (SCID) mice 4-7, the non-obese diabetic/SCID (NOD/SCID) mice 8,9 or the &#946;-microglobulin-knockout NOD/SCID mice 10,11.
Although murine models of human MM in some aspects can resemble the phenotype of human disease, immune-deficient mice are inbred, therefore simulate only one individual response to a drug and costs are very high. Due to immunosuppression animals require special maintenance conditions and the engraftment of human MM in mice requires 6 weeks to 2 months 9,12, unless cells are grafted directly to the bone marrow using a technically demanding procedure with lower rates of animal survival 7,13. Therefore, new methods using stem-cell based organoid models 14, tissue engineering 15 or sophisticated 3D cell culture models 16 have been established. They will compete in the near future with classical animal experiments for preclinical drug testing, but cannot replace systemic toxicity tests in living organisms.
The chicken embryo has been demonstrated before to be a suitable organism for xenotransplantation of human cells and tissues due to lack of adaptive immune response until hatching 17-19. Moreover, each chicken embryo reflects an individual reaction to applied drugs or tumor cells due to genetic diversity within the chicken population. The chorioallantoic membrane (CAM) is a well-established system to study tumor-dependent angiogenesis 20-22. When solid tumors are grafted to the CAM, they display many characteristics of cancers in vivo, including proliferation, invasion, angiogenesis and metastasis 23-27. 
Based on the previous experience of our group with CAM xenograft models20,26,27, a human MM model was established that combines the advantage of a human 3D culture system with the model of ex ovo developing chicken embryos. This MM model system allows real time monitoring of MM growth progression, quantification of cell mass and preclinical drug testing.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>RPMI-8226 cells</td>
			<td>DSMZ</td>
			<td>ACC 9</td>
			<td>STR profiled</td>
		</tr>
		<tr>
			<td>OPM-2 cells</td>
			<td>DSMZ</td>
			<td>ACC 50</td>
			<td>STR profiled</td>
		</tr>
		<tr>
			<td>Human mesenchymal stem cells&#160;</td>
			<td>PromoCell</td>
			<td>PC-C-12974</td>
			<td></td>
		</tr>
		<tr>
			<td>HEK293FT cells&#160;</td>
			<td>Invitrogen</td>
			<td>R700-07</td>
			<td></td>
		</tr>
		<tr>
			<td>RPMI1640 Medium</td>
			<td>Sigma Aldrich</td>
			<td>R0883</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum&#160; HyClone</td>
			<td>ThermoScientific</td>
			<td>SH30070.03</td>
			<td></td>
		</tr>
		<tr>
			<td>L-Glut- Pen- Strep solution</td>
			<td>Sigma</td>
			<td>G6784</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM Medium</td>
			<td>Gibco</td>
			<td>31966</td>
			<td></td>
		</tr>
		<tr>
			<td>NEAA</td>
			<td>Sigma Life Sciences</td>
			<td>M7145</td>
			<td></td>
		</tr>
		<tr>
			<td>Transfection Medium/Opti-MEM&#160;</td>
			<td>Gibco</td>
			<td>51985</td>
			<td></td>
		</tr>
		<tr>
			<td>eGFP lentiviral particles</td>
			<td>GeneCopoeia</td>
			<td>LPP-EGFP-LV105</td>
			<td>Ready to use viral particles</td>
		</tr>
		<tr>
			<td>pLenti6/V5Dest6 eGFP vector</td>
			<td>Invitrogen</td>
			<td>PN 35-1271</td>
			<td>from authors</td>
		</tr>
		<tr>
			<td>ViralpowerTM packaging mix&#160;</td>
			<td>Invitrogen</td>
			<td>P/N 35-1275</td>
			<td></td>
		</tr>
		<tr>
			<td>Transfection reagent/ Lipofectamin 2000</td>
			<td>Invitrogen</td>
			<td>11668-027</td>
			<td></td>
		</tr>
		<tr>
			<td>Blasticidin</td>
			<td>Invitrogen</td>
			<td>R210-01</td>
			<td></td>
		</tr>
		<tr>
			<td>Neomycin</td>
			<td>Biochrom</td>
			<td>A2912</td>
			<td></td>
		</tr>
		<tr>
			<td>Collagen-Type1&#160; Rat Tail</td>
			<td>BD Biosciences</td>
			<td>354236</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM powder</td>
			<td>Life Technologies</td>
			<td>Art.Nr. 10338582</td>
			<td></td>
		</tr>
		<tr>
			<td>plitidepsin</td>
			<td>Pharmamar</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>bortezomib</td>
			<td>LKT Lab., Inc.</td>
			<td>B5871</td>
			<td></td>
		</tr>
		<tr>
			<td rowspan="3">SPF-white hen eggs</td>
			<td rowspan="3">Charles River</td>
			<td rowspan="3"></td>
			<td rowspan="3">Fertilized&#160; white Leghorn&#160; chicken eggs</td>
		</tr>
		<tr>
		</tr>
		<tr>
		</tr>
		<tr>
			<td rowspan="2">Plastic weighing boats</td>
			<td rowspan="2">neoLab</td>
			<td rowspan="2">Art.Nr. 1-1125</td>
			<td rowspan="2">for ex-ovo culture</td>
		</tr>
		<tr>
		</tr>
		<tr>
			<td>Petridish square (Lids)</td>
			<td>Simport</td>
			<td>D210-16</td>
			<td>for ex-ovo culture</td>
		</tr>
		<tr>
			<td>RIPA Buffer (10x)</td>
			<td>Cell Signaling</td>
			<td>#9806</td>
			<td></td>
		</tr>
		<tr>
			<td>Protease Inhibitor Tablets</td>
			<td rowspan="2">Roche</td>
			<td rowspan="2">11 836 170 001</td>
			<td rowspan="2"></td>
		</tr>
		<tr>
			<td>Complete Mini EDTA-free</td>
		</tr>
		<tr>
			<td>GFP ELISA</td>
			<td>Cell Biolabs, Inc.</td>
			<td>AKR-121</td>
			<td></td>
		</tr>
		<tr>
			<td>Histocette II</td>
			<td>Simport</td>
			<td>M493-6</td>
			<td></td>
		</tr>
		<tr>
			<td>PFA&#160; 37%</td>
			<td>Roth</td>
			<td>7398.1</td>
			<td></td>
		</tr>
		<tr>
			<td>DPBS</td>
			<td>Lonza</td>
			<td>BE17-512F</td>
			<td></td>
		</tr>
		<tr>
			<td>Ethanol absolut</td>
			<td>Normapur</td>
			<td>20,821,321</td>
			<td></td>
		</tr>
		<tr>
			<td>Roti-Histol</td>
			<td>Roth</td>
			<td>Art.Nr.6640.4</td>
			<td></td>
		</tr>
		<tr>
			<td>Paraplast</td>
			<td>Sigma</td>
			<td>A6330</td>
			<td></td>
		</tr>
		<tr>
			<td rowspan="2">SuperFrost Microscope Slides</td>
			<td>R. Langenbrinck&#160;</td>
			<td>Art.-Nr.</td>
			<td rowspan="2"></td>
		</tr>
		<tr>
			<td>Labor- u. Medizintechnik</td>
			<td>03-0060</td>
		</tr>
		<tr>
			<td rowspan="2">DakoCytomation Wash Buffer 10x</td>
			<td rowspan="2">DakoCytomation</td>
			<td>Code-Nr.</td>
			<td rowspan="2"></td>
		</tr>
		<tr>
			<td>S 3006</td>
		</tr>
		<tr>
			<td rowspan="2">Target Retrieval Solution (10x)&#160; pH 6,1</td>
			<td rowspan="2">DAKO</td>
			<td>Code-Nr.</td>
			<td rowspan="2"></td>
		</tr>
		<tr>
			<td>S 1699</td>
		</tr>
		<tr>
			<td>H2O2</td>
			<td>Merck</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>m-a-hu ASMA clone 1A4</td>
			<td>DAKO</td>
			<td>M0851</td>
			<td></td>
		</tr>
		<tr>
			<td>m-a-hu CD138 clone MI15</td>
			<td>DAKO</td>
			<td>M7228</td>
			<td></td>
		</tr>
		<tr>
			<td>m-a-hu Vimentin clone V9</td>
			<td>DAKO</td>
			<td>M0725</td>
			<td></td>
		</tr>
		<tr>
			<td>m-a-hu Desmin clone D33</td>
			<td>DAKO</td>
			<td>&#160;M0760</td>
			<td></td>
		</tr>
		<tr>
			<td>m-a-hu Ki67&#160; clone MIB-1&#160;&#160;</td>
			<td>DAKO</td>
			<td>&#160;M7240</td>
			<td></td>
		</tr>
		<tr>
			<td>biotinylated goat- anti-mouse IgG</td>
			<td>Vector Laboratories Inc.</td>
			<td>BA-9200</td>
			<td></td>
		</tr>
		<tr>
			<td>Vectastain Elite ABC Kit</td>
			<td>Vector Laboratories Inc.</td>
			<td># PK-6100</td>
			<td></td>
		</tr>
		<tr>
			<td>FAST DAB Tablet Set.</td>
			<td>Sigma Biochemicals</td>
			<td># D4293</td>
			<td></td>
		</tr>
		<tr>
			<td>Mayer&#8217;s haemalaun solution</td>
			<td>Merck</td>
			<td>1,092,490,500</td>
			<td></td>
		</tr>
		<tr>
			<td>Roti Histokitt</td>
			<td>Roth</td>
			<td>Art.Nr.6638.2</td>
			<td></td>
		</tr>
		<tr>
			<td></td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Bench top rotary microtome</td>
			<td>Thermo Electron, Shandon Finesse ME+</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Tissue embedding station</td>
			<td>Leica, TP1020</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Egg-Incubator</td>
			<td>Grumbach&#160;</td>
			<td>BSS160</td>
			<td></td>
		</tr>
		<tr>
			<td>Stereo fluorescence microscope equipped with an connected with a digital camera (Olympus E410) and flexible cold light&#160;</td>
			<td>Olympus, SZX10</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Ultra Turrax&#160;</td>
			<td>IKA T10</td>
			<td></td>
			<td>Homogenizer</td>
		</tr>
	</tbody>
</table>

establishment of a human multiple myeloma xenograft model in the chicken to study tumor growth, invasion and angiogenesis

Multiple myeloma (MM), a malignant plasma cell disease, remains incurable and novel drugs are required to improve the prognosis of patients. Due to the lack of the bone microenvironment and auto/paracrine growth factors human MM cells are difficult to cultivate. Therefore, there is an urgent need to establish proper in vitro and in vivo culture systems to study the action of novel therapeutics on human MM cells. Here we present a model to grow human multiple myeloma cells in a complex 3D environment in vitro and in vivo. MM cell lines OPM-2 and RPMI-8226 were transfected to express the transgene GFP and were cultivated in the presence of human mesenchymal cells and collagen type-I matrix as three-dimensional spheroids. In addition, spheroids were grafted on the chorioallantoic membrane (CAM) of chicken embryos and tumor growth was monitored by stereo fluorescence microscopy. Both models allow the study of novel therapeutic drugs in a complex 3D environment and the quantification of the tumor cell mass after homogenization of grafts in a transgene-specific GFP-ELISA. Moreover, angiogenic responses of the host and invasion of tumor cells into the subjacent host tissue can be monitored daily by a stereo microscope and analyzed by immunohistochemical staining against human tumor cells (Ki-67, CD138, Vimentin) or host mural cells covering blood vessels (desmin/ASMA).
In conclusion, the onplant system allows studying MM cell growth and angiogenesis in a complex 3D environment and enables screening for novel therapeutic compounds targeting survival and proliferation of MM cells.

In vitro analysis of target compounds in 3D multiple myeloma spheroid assays
Due to the limitation of culturing primary human MM cells in vitro we established new 3D in vitro culture models for human MM cell lines making use of an extracellular growth matrix and supportive primary human mesenchymal cells from bone marrow (Figure 1A,&#160;B). EGFP transgenic MM cell lines allow visualization and quantification of MM t...

Watch this Scientific Journal Video about Establishment of a Human Multiple Myeloma Xenograft Model in the Chicken to Study Tumor Growth, Invasion and Angiogenesis at JoVE.com

Establishment of a Human Multiple Myeloma Xenograft Model in the Chicken to Study Tumor Growth, Invasion and Angiogenesis

Human multiple myeloma (MM) cells require the supportive microenvironment of mesenchymal cells and extracellular matrix components for survival and proliferation. We established an in vivo chicken embryo model with engrafted human myeloma and mesenchymal cells to study effects of cancer drugs on tumor growth, invasion and angiogenesis.

Multiple myeloma (MM), a malignant plasma cell disease, remains incurable and novel drugs are required to improve the prognosis of patients. Due to the ...

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12.9K ビュー.  Innsbruck Medical University. ヒト多発性骨髄腫（MM）細胞は、間葉系細胞と生存および増殖のための細胞外マトリックス成分の支援微小環境が必要です。我々は、腫瘍の増殖、浸潤および血管形成に対する抗がん剤の効果を研究するために移植されたヒト骨髄腫および間葉細胞とin vivoでニワトリ胚モデルを確立しました。 