[Phase I study of KW2083 7-N-(p-hydroxyphenyl) mitomycin C]. 
KW2083 7-N-(p-hydroxyphenyl) mitomycin C is a mitomycin C derivative, but not its masked compound.  KW2083 differs from mitomycin C in various points.  A phase I study of KW2083 by single intravenous injection was performed in 21 patients with advanced solid tumor.  The dose limiting factor of this drug is marrow depression, and 70mg/m2 causing marked thrombocytopenia was determined as maximum tolerated dose.  The thrombocyte count and the WBC count reached to nadir the minimum 2 to 3 weeks after and 1 to 2 weeks after the administration and recovered in 1 to 2 weeks and in 2 to 3 weeks respectively.  As gastrointestinal symptoms, nausea or vomiting (38.1%), and anorexia (28.6%) occurred soon after the administration, and stomatitis and diarrhea were also observed in one case each.  In addition, petechia, hemorrhagic tendency and fever were found in one case each.  Patients receiving 70mg/m2 showed slight alopecia and transient slight in GOT and GPT elevation.