BLOC1S3 and neoplasm: Moreover, in the case described by Suzuki et al., a patient with UTROSCT had elevated serum calcium and parathormone (PTH-rP) levels, and in this case the tumor’s production of PTH-rP was demonstrated by normalization of serum PTH-rP after a tumorectomy, as well as by the presence of immunoreactivity for PTHrP in the tumor cells [37].