The disclosure relates to the field of 
molecular pathology (for example, 
cancer diagnosis, prognosis, treatment and / or therapy prediction) through the detection of 
RNA, mutations, copy number changes and determination of the 
methylation status of specific sequences of the 
genome of individual patients in hybridization assays (
southern blot, ISH, 
dot blot) including in situ determination of the 
methylation status of specific sequences of the 
genome of individual patients in individual cells. More specifically, this disclosure relates to: a) target-specific probes covalently attached to a labeled 
tail, b) the synthesis method of said the probe, c) the usage of said the probe such as an 
in situ hybridization-based method to correlate the 
methylation status of a 
promoter region of a 
gene in a 
biopsy or 
cytology specimen of a patient to the morphology and localization in that specimen, and d) kits comprising the target-specific probes. The latter method and products allow detection of (epi) genetic changes in specific 
cell types of histological or cytological (
cancer) specimens or on membranes that will contribute to scientific research and that will help physicians to accurately diagnose diseases and / or start an appropriate treatment.