1. Editors' preface

   EditorialNotes Pages: 175 - 176

2. Heterogeneity of human colon carcinoma

   • M. G. Brattain
   • A. E. Levine
   • B. Long

   OriginalPaper Pages: 177 - 191

3. Somatic cell fusion as a source of genetic rearrangement leading to metastatic variants

   • L. Larizza
   • V. Schirrmacher

   OriginalPaper Pages: 193 - 222

4. Invasiveness of primary brain tumors

   • Ole Didrik Laerum
   • Rolf Bjerkvig
   • Leo de Ridder

   OriginalPaper Pages: 223 - 236

5. Biological significance of interstitial collagenase in DMBA-induced mammary tumors of the rat

   • Gerhard Wirl

   OriginalPaper Pages: 237 - 248

6. Cysteine proteinases and metastasis

   • Bonnie F. Sloane
   • Kenneth V. Honn

   OriginalPaper Pages: 249 - 263

7. Invasiveness of transformed bladder epithelial cells

   • Jørgen v. F. Kieler

   OriginalPaper Pages: 265 - 296

8. Announcement

   Announcement Pages: 297 - 298