<prompt> All of the following are poor prognostic markers of multiple myeloma, except:t1;14t14;161q gaint14;20  <response>: Several cytogenetic abnormalities such as t4;14, del1717p, t14;16, t14;20, nonhyperdiploidy, and gain1q are identified that confer poor prognosis in cases of multiple myeloma. 