A system for treating cervical and/or uterine cancers in brachytherapy with an intracavitary brachytherapy applicator, comprising: a tandem assembly comprising a tandem and a tandem connector, the tandem adapted for insertion into a cervix of a patient and the tandem connector adapted to receive the tandem within an interior of the tandem connector along a longitudinal axis, the tandem comprising a multi-lumen shaft configured to receive an optical fiber therethrough; an ovoid assembly comprising first and second adjustably inflatable ovoids (312, 314) and an ovoid support mechanism, the ovoid assembly comprising a unidirectional adjustment mechanism and first and second handles (344, 346), the handles each having a multi-lumen shaft and being configured to support the respective first and second inflatable ovoids (312, 314), wherein the handles (344, 346) are configured to allow for user manipulation to control a relative position of the ovoids (312, 314) using the unidirectional adjustment mechanism for insertion of the ovoids (312, 314) within fornices of a patient, the first and second adjustably inflatable ovoids (312, 314) having a deflated configuration for insertion into a patient and one or more adjustably inflated configurations for positioning the ovoid assembly during treatment; a first inflatable retractor adapted to be releasably coupled to the ovoid assembly, the first inflatable retractor having a deflated configuration for insertion into a patient and an adjustably inflated configuration for retraction of tissue during treatment; wherein the tandem and the first and second inflatable ovoids (312, 314) are adapted to be coupled to a radioactive source to deliver an implant radiation dose suitable for cancer treatment at a cancerous cervical and/or uterus treatment site in a patient; characterised in that the tandem connector has a plurality of adjustment elements arranged along the longitudinal axis for establishing a longitudinal position of the ovoid assembly relative to the tandem. a tandem assembly comprising a tandem and a tandem connector, the tandem adapted for insertion into a cervix of a patient and the tandem connector adapted to receive the tandem within an interior of the tandem connector along a longitudinal axis, the tandem comprising a multi-lumen shaft configured to receive an optical fiber therethrough; an ovoid assembly comprising first and second adjustably inflatable ovoids (312, 314) and an ovoid support mechanism, the ovoid assembly comprising a unidirectional adjustment mechanism and first and second handles (344, 346), the handles each having a multi-lumen shaft and being configured to support the respective first and second inflatable ovoids (312, 314), wherein the handles (344, 346) are configured to allow for user manipulation to control a relative position of the ovoids (312, 314) using the unidirectional adjustment mechanism for insertion of the ovoids (312, 314) within fornices of a patient, the first and second adjustably inflatable ovoids (312, 314) having a deflated configuration for insertion into a patient and one or more adjustably inflated configurations for positioning the ovoid assembly during treatment; a first inflatable retractor adapted to be releasably coupled to the ovoid assembly, the first inflatable retractor having a deflated configuration for insertion into a patient and an adjustably inflated configuration for retraction of tissue during treatment; wherein the tandem and the first and second inflatable ovoids (312, 314) are adapted to be coupled to a radioactive source to deliver an implant radiation dose suitable for cancer treatment at a cancerous cervical and/or uterus treatment site in a patient; characterised in that the tandem connector has a plurality of adjustment elements arranged along the longitudinal axis for establishing a longitudinal position of the ovoid assembly relative to the tandem.