KANK1-PDGFRB is a unique example of a thrombocythemia-associated oncogene that does not signal via JAK2. The fusion protein is activated by multiple oligomerization domains, which are required for signaling and cell growth stimulation.
Medves, S., Noël, L. A., Montano-Almendras, C. P., Albu, R. I., Schoemans, H., Constantinescu, S., & Demoulin, J. B. (2011). Multiple oligomerization domains of KANK1-PDGFRβ are required for JAK2-independent hematopoietic cell proliferation and signaling via STAT5 and ERK. Haematologica : the hematology journal, 96(10), 1406-1414. https://doi.org/10.3324/haematol.2011.040147 (Original work published 2011)