Background/Objectives: The growing population of cancer survivors has increased the need for reliable, culturally appropriate instruments to identify unmet supportive care needs. The Cancer Survivors’ Unmet Needs Measure (CaSUN) is a survivorship-specific assessment tool, but validated Russian and Kazakh versions have not previously been available. This study aimed to translate and culturally adapt CaSUN, evaluate its psychometric properties in cancer survivors in Kazakhstan, and examine unmet needs relevant to survivorship care. Methods: This cross-sectional psychometric validation study included 404 cancer survivors (Russian version, n = 201; Kazakh version, n = 203). Translation and cultural adaptation involved forward- and back-translation, expert review, cognitive debriefing, and pilot testing. Internal consistency was assessed using Cronbach’s alpha. Construct validity was evaluated using exploratory (EFA) and confirmatory factor analysis (CFA), with measurement invariance examined across language versions. Unmet needs and associated demographic and clinical factors were also examined. Results: Both versions demonstrated excellent internal consistency (Cronbach’s alpha: Russian = 0.966; Kazakh = 0.978). KMO values were 0.920 and 0.940, respectively (Bartlett’s tests, p < 0.001). EFA yielded a five-factor solution explaining 68.1% and 64.2% of the variance in the Russian and Kazakh versions, respectively; however, parallel analysis supported five factors in the Russian sample but suggested three in the Kazakh sample, indicating greater structural uncertainty for the Kazakh version. CFA demonstrated good incremental fit in both language groups (Russian: CFI = 0.975, TLI = 0.973; Kazakh: CFI = 0.973, TLI = 0.971), although RMSEA (0.096 and 0.102, respectively) and SRMR (0.116 and 0.099, respectively) indicated residual model misfit. Metric invariance was supported, while scalar invariance was supported by conventional fit index criteria but should be regarded as provisional. The most frequent unmet needs concerned medical care, up-to-date information, and involvement in health management. Younger age, male sex, urban residence, a history of cancer recurrence, and Kazakh language completion were independently associated with more unmet needs. Conclusions: The Russian and Kazakh CaSUN versions demonstrated high internal consistency and evidence supporting construct validity and cross-language comparability. These culturally adapted versions may support systematic needs assessment and patient-centered survivorship care in multilingual oncology services in Kazakhstan.

Walking recovery is a central goal of geriatric rehabilitation, but it is shaped by multiple interacting factors rather than by muscle impairment alone. This mini-review examines whether sarcopenia-related weakness, low muscle quality, and reduced physical reserve identify a clinically important vulnerability phenotype relevant to delayed gait recovery in older adults after hospitalization, hip fracture, surgery, or cardiac procedures. We summarize current consensus definitions of sarcopenia, explain why muscle strength and physical performance are often more clinically informative than muscle mass alone, and review the mechanistic pathways that may connect sarcopenia with impaired walking, including anabolic resistance, inflammation, disuse, neuromuscular remodeling, trunk weakness, and cognitive–emotional modifiers. Across community, orthogeriatric, post-acute, and cardiac rehabilitation settings, sarcopenia markers are generally associated with slower gait or poorer attained mobility; however, findings for change in mobility are inconsistent, and most available studies are observational, heterogeneous, or indirect. Sarcopenia should therefore be interpreted as one potential marker of reduced reserve and mobility risk rather than as a determinant of walking recovery or evidence that sarcopenia-aware rehabilitation improves outcomes. Future work should use more consistent diagnostic frameworks and test whether a sarcopenia-aware rehabilitation integrating early strength assessment, individualized nutrition care, and multicomponent gait rehabilitation improve walking outcomes in medically complex older adults beyond current standards of care.