Cancer prevention in Indonesia increasingly requires integrated strategies that combine risk reduction, early detection, and evidence‑based preventive interventions. Indonesia’s biodiversity and long-established herbal medicine traditions (including jamu) provide a unique opportunity for medicinal plant biochemistry research to contribute to prevention through mechanism‑aligned pathways. However, many plant-based studies remain trapped at early evidence stages—single antioxidant assays, crude extracts, uncertain compound identification, limited standardization, and scarce human biomarker studies—making translation difficult and sometimes leading to overclaims. This article provides a framework synthesis (≤2024) of medicinal plant biochemistry research relevant to cancer prevention in Indonesia. We integrate (1) biochemical mechanisms of carcinogenesis and prevention (e.g., oxidative stress and DNA damage, inflammation, detoxification balance, apoptosis, angiogenesis, immune surveillance), (2) metabolomics standards and dereplication workflows for natural products (Fiehn, 2002; Sumner et al., 2007; Wolfender et al., 2019; Qin et al., 2022), (3) evidence on natural products as sources of therapeutics and multi‑target bioactives (Newman & Cragg, 2020; Atanasov et al., 2021), and (4) governance and quality control requirements (CBD, 2011; Oberthür & Rosendal, 2014; WHO, 2011) alongside Indonesian regulatory framing for traditional medicines (BPOM, 2019). Results are presented as two conceptual figures and three implementation tables mapping key biochemical targets and assay panels, an evidence‑to‑translation ladder for prevention claims, and institutional strategies to strengthen governance readiness, reproducibility, quality assurance, and partnership-based biomarker studies. We argue that the highest-impact approach is to treat governance, taxonomy, metadata, QA/QC, and staged human evidence as core research outputs—supported by shared analytical infrastructure and clinical/public health partnerships. The paper concludes with a practical roadmap for Indonesian universities to produce credible, ethical, and scalable medicinal plant biochemistry research that supports cancer prevention.