Purpose: The purpose of this study was to develop a scale to evaluate posttraumatic growth in patients with cancer and to examine the validityand reliability of the scale. Methods: A literature review, semi-structured patient interviews and an expert panel consultation produced a 27 preliminaryitem questionnaire. Participants were 150 cancer patients recruited to test the reliability and validity of the preliminary scale. Data wereanalyzed using item analysis, exploratory factor analysis, convergent validity and internal consistency. Results: Item reduction and exploratoryfactor analysis led to 23 items, grouped into five subscales which were labelled new possibilities (6 items), coping skills (5 items), preciousness oflife (5 items), relating to others (4 items), and personal strength (3 items). Convergent validity was evaluated by total correlation with the FunctionalAssessment of Cancer Therapy-General (r=.45, pqqqlt;.001). The final scale demonstrated satisfactory internal consistency (Cronbach’s a =.94). Conclusion: Findings from this study indicate that the Cancer-Specific Posttraumatic Growth Inventory has validity and reliability and is consideredto be appropriate for assessing posttraumatic growth in patients with cancer.