A method in a network node for handling a cache session between the network node and a user equipment during a handover of the user equipment from a source cell of a first RAT to a target cell of a second RAT being different from the first RAT is provided. The user equipment and the network node are comprised in a wireless communications system. The network node receives (704) an identifier. The identifier identifies a cache session in the network node. The cache session is associated with a play-out for a media stream to the user equipment via a source base station serving the user equipment in the source cell. The network node identifies (705) the cache session as pertaining to the user equipment subject to said handover, by means of the received identifier. The network node then continues (708) the identified cache session via a target base station serving the target cell, when the handover of the user equipment from the source cell to the target cell has been performed.