GPR55 and glioblastoma: The expression patterns of PINK1, GPR55, and mutant p53 were evaluated in glioblastoma patient samples, revealing that PINK1 was detected in 65% of cases (13 positive and 7 negative), GPR55 was highly expressed in 95% (19 positive and 1 negative), and p53 mutations were present in 30% (6 positive and 14 negative).