Hi, Sorry to read about your husband and fully understand how you both must feel also how life can change so quickly.
I did not have that reading of kappa light chain figure mine was approx 1200, the reason why I thought to reply is that most people quote Para protein levels and rarely kappa light. I am no expert in any respect of this but my thought is that having Non Secretory MM shows up with kappa light testing ( please correct me if wrong ).
Like I mentioned mine was approx 1200 before diagnosis and in that time caused considerable bone damage, however my treatment consisted of 7 cycles of oral CDT and the level dropped rapidly hopefully your husbands will drop rapidly. I am also getting ready for SCT it was put back a month due to a blood clot in the leg.
Their is a web site called Myeloma Beacon, it is a USA forum and my wife has read about patients whose kappa light chain levels are like your husband and higher, so you may wish to check it out. I would only say that some of the drugs and readings differ in respect of being American.
Regards Chris T.